CN114381730A - High-wear-resistance component, preparation method thereof, structural component and terminal - Google Patents

Abstract

The embodiment of the application provides a high-wear-resistance member, which comprises a member base body, and a seeping layer and a wear-resistance composite coating which are sequentially arranged on the member base body, wherein the wear-resistance composite coating comprises at least two stacked sandwich structures along the thickness direction, each sandwich structure comprises a metal priming layer, a diamond-like carbon layer and a middle layer clamped between the metal priming layer and the diamond-like carbon layer, and the metal priming layer in each sandwich structure is close to the seeping layer; wherein the intermediate layer is a mixed layer comprising a metal and a carbide of the metal; the material of the component substrate comprises a steel substrate. The high-wear-resistance component is high in hardness and excellent in wear resistance, can be used for preparing a terminal product structural member, achieves small volume of a terminal product, simultaneously considers reliability, and improves product competitiveness. The application also provides a preparation method, a structural part and a terminal of the high-wear-resistance component.

Description

High wear-resistant component and preparation method thereof, structural component and terminal

technical field

The present application relates to the technical field of composite materials, in particular to a highly wear-resistant component and a preparation method thereof, a structural component and a terminal.

Background technique

At present, terminal products such as mobile phones and tablet computers are developing in the direction of small size. In order to improve the user experience and service life of small-volume terminal products, higher requirements are placed on the wear resistance of structural parts such as rotating shafts in the terminal products. However, the existing rotating shaft is usually made of stainless steel and other steel base materials, which is difficult to meet the increasingly strict wear resistance requirements. Therefore, it is necessary to develop a wear-resistant coating with better wear resistance.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present application provide a highly wear-resistant component, which has a permeable layer and a thick and hard wear-resistant composite coating, which can significantly improve its wear resistance without affecting the space ratio of the component and service life, the component can be used to prepare the structural parts of the end product, so as to realize the small size of the end product while taking into account the reliability.

Specifically, the first aspect of the embodiments of the present application provides a highly wear-resistant component, comprising a component base, a permeation layer and a wear-resistant composite coating sequentially arranged on the component base, and the wear-resistant composite coating is along the thickness of the component. The orientation includes at least two stacked sandwich structures, each of the sandwich structures including a metal primer, a diamond-like layer, and an intermediate layer sandwiched between the metal primer and the diamond-like layer, each of the The metal base layer in the sandwich structure is close to the infiltration layer; wherein, the intermediate layer is a mixed layer including metal and carbide of the metal; the material of the component base includes a steel base material.

In the embodiment of the present application, in the intermediate layer, the mass concentration of the carbide of the metal is 5%-60%, and the mass concentration of the metal is 40%-95%. At the same time, it contains a suitable content of metal carbide and a metal intermediate layer, which can better provide a good stress buffer between the metal base layer and the diamond-like carbon layer, so that each sandwich structure has a small internal stress and a high Film base bond strength.

In some embodiments of the present application, from the component base to the infiltration layer, the mass percentage content of the metal in the intermediate layer gradually decreases, and the mass percentage content of the carbide of the metal gradually increases. At this time, a gradient transition of toughness from "soft" to "hard" can be gradually formed from the metal bottom layer to the diamond-like layer, which is more conducive to reducing the internal stress of the sandwich structure.

In some embodiments of the present application, the intermediate layer may further include diamond-like carbon. At this time, the intermediate layer can better provide stress buffering between the primer layer and the diamond-like layer.

In the embodiment of the present application, the mass percentage content of the diamond-like carbon in the intermediate layer gradually increases from the component base to the infiltrating layer.

In the embodiment of the present application, the thickness of each of the intermediate layers is independently in the range of 0.05 μm-1 μm.

In the embodiments of the present application, the thickness of each of the diamond-like layers is independently in the range of 0.05 μm-5 μm.

In the embodiment of the present application, in the direction from the component substrate to the infiltration layer, in the wear-resistant composite coating, the thickness of the diamond-like layer farthest from the infiltration layer is greater than the thickness of the other diamond-like layers. . At this time, the outermost part of the component is the diamond-like carbon layer with the thickest thickness, which can significantly improve the wear resistance of the component, making it suitable for use in scenarios with high hardness and high wear resistance requirements.

In the embodiment of the present application, in the two diamond-like layers in any two adjacent sandwich structures, the thickness of the diamond-like layer far from the seepage layer is greater than the thickness of the diamond-like layer near the seepage layer. .

In the embodiment of the present application, the thickness of each of the metal primer layers is independently in the range of 0.05 μm-3 μm.

In the embodiment of the present application, the number of the sandwich structures is 3-40.

In the embodiment of the present application, the thickness of the wear-resistant composite coating is 4.5 μm-60 μm. Thicker wear-resistant composite coatings can significantly improve the wear resistance and service life of components.

In the embodiment of the present application, the Vickers hardness of the wear-resistant composite coating is greater than or equal to 1200HV.

In the embodiments of the present application, the infiltrated layer includes a carburized layer, a nitrided layer, a carbonitrided layer, a boronized layer, a siliconized layer or a borosilicated layer.

In the embodiment of the present application, the surface roughness of the side of the infiltration layer close to the wear-resistant composite coating is less than or equal to 1 μm. At this time, the infiltration layer removes many infiltration layer elements contained on the surface, with low roughness, high density, and correspondingly high hardness, and a coating with high bonding force and good flatness can be formed on it.

In the embodiment of the present application, the thickness of the infiltration layer is 4 μm-150 μm, and the Vickers hardness of the infiltration layer is greater than or equal to 900HV. The infiltration layer with higher hardness is more conducive to the improvement of the overall hardness of the component.

In the embodiment of the present application, the material of the metal primer layer includes one or more of titanium, chromium, tungsten, zirconium, molybdenum, nickel, niobium, copper, aluminum, magnesium, zinc, vanadium, and alloys thereof.

In some embodiments of the present application, the intermediate layer contains the same metal element as that in the metal primer layer.

In the embodiments of the present application, the steel base material includes one or more of carbon steel and alloy steel.

In the embodiments of the present application, the component base includes a rotating shaft component, a mold, a tool, or other components.

In the highly wear-resistant component provided by the first aspect of the embodiment of the present application, a permeation layer and a wear-resistant composite coating are sequentially arranged on the component substrate, and the wear-resistant composite coating includes at least two components consisting of a metal base layer-intermediate layer-type Sandwich structure of diamond layer, the wear-resistant composite coating has extremely low internal stress and large film-base bonding force, which can endow the component with high hardness and excellent wear resistance, increase service life, and use the component to prepare terminals The product structure can realize the small size of the end product while taking into account the reliability and enhance the competitiveness of the product.

A second aspect of the embodiments of the present application also provides a method for preparing a highly wear-resistant component, including:

(1) forming a permeation layer on the surface of the component base, and smoothing the surface of the permeation layer; wherein, the material of the component base includes a steel base material;

(2) sequentially depositing a metal primer layer, an intermediate layer and a diamond-like carbon layer on the infiltrating layer to obtain a sandwich structure, wherein the intermediate layer is a mixed layer comprising a metal and a carbide of the metal;

(3) Redepositing and preparing at least one of the sandwich structures according to the step (2), forming a wear-resistant composite coating comprising at least two stacked sandwich structures, to obtain a highly wear-resistant component.

In the embodiment of the present application, the formation process of the intermediate layer includes: turning on the metal target, introducing a gaseous carbon source into the vacuum chamber of the coating equipment, and gradually increasing the gas flow of the gaseous carbon source to form the intermediate layer ; Wherein, along the thickness growth direction of the intermediate layer, the mass percentage content of the metal gradually decreases, and the mass percentage content of the metal carbide gradually increases.

The method for preparing a highly wear-resistant component provided by the second aspect of the embodiment of the present application has the advantages of simple process, low cost and high production efficiency, and is suitable for industrialized batch preparation. The obtained high wear-resistant component has better coating thickness, hardness and wear resistance.

A third aspect of the embodiments of the present application further provides a structural member, and the structural member includes the highly wear-resistant member described in the first aspect of the embodiments of the present application. For example, the structural member may be a final product structural member such as a rotating shaft that has high wear resistance requirements.

A fourth aspect of the embodiments of the present application further provides a terminal, where the terminal includes the structural member described in the third aspect of the embodiments of the present application.

Description of drawings

FIG. 1 is a schematic structural diagram of a highly wear-resistant component provided in an embodiment of the application;

2 is a schematic structural diagram of a rotating shaft of a folding mobile phone provided in an embodiment of the application;

FIG. 3 is a schematic structural diagram of a terminal provided in an embodiment of the present application.

Detailed ways

The technical solutions of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

Referring to FIG. 1 , an embodiment of the present application provides a highly wear-resistant component, including a component base 10 . The material of the component base 10 includes a steel base material, and the highly wear-resistant component further includes a permeation layer 20 sequentially arranged on the component base 10 . and a wear-resistant composite coating, the wear-resistant composite coating includes at least two stacked sandwich structures along the thickness direction, each of the sandwich structures includes a metal primer layer 301, a diamond-like layer 303, and a metal primer layer 301 sandwiched between Between the intermediate layer 302 and the diamond-like carbon layer 303, the metal base layer 301 in each sandwich structure is close to the infiltration layer; wherein, the intermediate layer 302 is a mixed layer including metal and metal carbide.

In this application, the metal bottom layer can be denoted as A, the intermediate layer can be denoted as B, the diamond-like layer can be denoted as C, and the arrangement of the wear-resistant composite coating from the component base 10 to the infiltration layer 20 in the thickness direction is (ABC) _n ; wherein A is close to the permeable layer 20 . From the component base 10 to the infiltration layer 20, each sandwich structure of the wear-resistant composite coating can be sequentially recorded as 31, 32...3n. In this way, from the surface of the component base 10 upward, the coating layer thereon sequentially includes the infiltration layer 20, the first sandwich structure 31 (ABC), the second sandwich structure 32 (ABC), . . . the nth sandwich structure 3n (ABC).

In the embodiment of the present application, the highly wear-resistant component has both a permeation layer 20 and a thick and hard wear-resistant composite coating, wherein the permeation layer 20 can provide a substrate with high density and high hardness, and the permeation layer 20 and the component The bonding between the substrates 10 is relatively firm, and it is convenient to form a high-bonding, thick and hard wear-resistant composite coating thereon. The wear-resistant composite coating can significantly improve the space ratio of the components. Improve the wear resistance and service life of components. The component can be used to prepare structural parts of end products, so as to realize the small volume of the end products while taking into account the reliability.

In the embodiment of the present application, the material of the component base 10 includes a steel base material, and the molding method includes one or more of machining, 3D printing, press molding, injection molding, and the like. The component base 10 can be made entirely or partially from a steel base material. When all the component bases 10 are formed of steel base materials, they may be steel base materials with a single composition, or may be a superimposed structure of steel base materials with different compositions. When the component base 10 is partially prepared from a steel base material, for example, the component base 10 is a laminate of an aluminum alloy layer and a steel base material layer, and subsequently a permeation layer and a wear-resistant composite coating can be sequentially provided on the steel base material layer. Wait. That is, at this time, the infiltration layer 20 is provided on the steel base material side of the member base body.

In the embodiments of the present application, the steel base material may include one or more of carbon steel and alloy steel. Among them, carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Alloy steel is a steel made by adding some alloying elements on the basis of carbon steel. According to the types of alloying elements, alloy steel can be divided into chromium steel, manganese steel, chromium-manganese steel, chromium-nickel steel, etc. According to characteristics and uses, alloy steel can be divided into alloy structural steel (used as engineering components, etc.), alloy tool steel, etc. (used as molds, knives, etc.), special functional steel (such as stainless steel, acid-resistant steel, heat-resistant steel, etc.).

In the embodiment of the present application, the infiltration layer 20 may include a carburized layer, a nitrided layer, a carbonitrided layer, a boronized layer, a siliconized layer, or a borosilicated layer, but is not limited thereto. Since the infiltration layer 20 is formed on the steel substrate, during the growth process of the infiltration layer 20, the infiltration layer may be affected by the steel substrate. Therefore, the infiltration layer 20 may also contain steel substrate elements.

The infiltration layer 20 in the present application is a surface-removed infiltration layer that has undergone smoothing treatment, and has low roughness, high density, and high hardness, and is conducive to forming a coating with high bonding force and good flatness thereon. In some embodiments of the present application, the surface roughness Ra of the side (ie, the surface layer) of the infiltration layer 20 close to the wear-resistant composite coating may be less than or equal to 1 μm. In some embodiments of the present application, the element content of the surface infiltration layer of the infiltration layer 20 does not exceed 70 wt %.

In the embodiment of the present application, the thickness of the permeation layer 20 may be 4 μm-150 μm. Appropriate infiltrating layer thickness can help provide a high-resistance substrate on which a thick, hard, wear-resistant composite coating can be formed. In some embodiments, the thickness of the permeation layer 20 may be 4-30 μm. For example, it may be 10 μm-30 μm, 15 μm-30 μm or 16 μm-30 μm.

In the embodiment of the present application, the Vickers hardness of the steel substrate with the infiltration layer is much higher than that of the steel substrate without the infiltration layer. For example, the Vickers hardness of the steel substrate without the infiltration layer is generally less than 500HV, while the steel substrate with the infiltration layer The Vickers hardness of the steel substrate of the layer can reach more than 900HV. In some embodiments, the Vickers hardness of the infiltration layer may be greater than or equal to 1000HV. However, the wear resistance of the component base with only the infiltrated layer 20 can no longer match the increasingly strict wear resistance requirements. Take the folding mobile phone shaft made of stainless steel MIM17-4 after carburizing as an example, it has undergone 5000 opening and closing times. Later, the amount of wear becomes significantly larger, and the carburized layer will be worn away. Therefore, in the embodiment of the present application, a thick and hard wear-resistant composite coating is provided on the basis of the infiltration layer 20, so as to endow the component with more excellent wear-resistant performance.

In the embodiment of the present application, the metal primer layer 301 is a “soft layer” with high toughness, which can provide a stress buffer between the infiltration layer 20 and the intermediate layer 302 and improve the adhesion strength of the intermediate layer 302 . The metal primer layer 301 may be a metal element layer, an alloy layer, or a composite layer of a metal element and an alloy. In the embodiment of the present application, the material of the metal primer layer 301 may include titanium (Ti), chromium (Cr), tungsten (W), zirconium (Zr), molybdenum (Mo), nickel (Ni), niobium (Nb), copper One or more of (Cu), aluminum (Al), magnesium (Mg), zinc (Zn), vanadium (V) and alloys thereof. In some embodiments of the present application, the material of the metal primer layer 301 is one or more of titanium, chromium, tungsten, zirconium and alloys thereof.

The metal primer layer 301 may be a one-layer or multi-layer structure. For example, the metal base layer can be a single layer of metal titanium, a stack of metal titanium layers and metal chromium layers, an alloy layer of titanium and chromium, or a stack of metal titanium layers and aluminum alloys, etc. . Wherein, when the metal primer layer 301 is an alloy layer, the alloy layer may be a single-layer structure composed of an alloy with a certain composition, or a double-layer structure or a multi-layer structure composed of two or more alloys with different compositions. In some embodiments of the present application, the metal primer layer 301 is a Ti layer, a Cr layer, a Zr layer, a TiCr alloy layer, etc. that can better provide stress buffering.

In this application, the intermediate layer 302 is a mixed layer including metal and metal carbide. The intermediate layer 302 with this composition can provide a good stress buffer between the metal base layer 301 and the diamond-like carbon layer 303, so that each sandwich structure has a small internal stress and a high film-base bonding strength, which is beneficial to each film stability. In some embodiments of the present application, the metal element of the intermediate layer 302 may be completely different from the metal element of the metal primer layer 301 . In other embodiments of the present application, the intermediate layer 302 may contain the same metal element as that in the metal underlayer 301 . That is, the metal element in the intermediate layer 302 may be exactly the same as the metal element in the metal underlayer 301 (in this case, the intermediate layer 302 may be referred to as a mixed layer including the metal underlayer material and the carbide of the metal underlayer material), or Parts are the same (the metal underlayer 301 at this time contains a variety of metal elements).

In the embodiment of the present application, in the intermediate layer 302, the mass concentration of metal carbide is 5%-60%, and the mass concentration of metal is 40%-95%. At the same time, the intermediate layer containing suitable content of metal carbide and metal can better provide a good stress buffer between the metal base layer 301 and the diamond-like carbon layer 303, so that each sandwich structure has a smaller internal stress and higher High film base bond strength.

In some embodiments of the present application, from the component base 10 to the infiltrated layer 20 , the mass percentage of metal in the intermediate layer 302 gradually decreases while the mass percentage of metal carbide gradually increases. In this way, a gradient transition of toughness from "soft" to "hard" can be gradually formed from the metal bottom layer 301 to the diamond-like layer 302, which is more conducive to the reduction of the internal stress of the sandwich structure and the improvement of the bonding force with the infiltration layer, and also conducive to The high-strength bonding between the intermediate layer 302 and the metal primer layer 301 and the diamond-like carbon layer 302 respectively. In some embodiments of the present application, the mass percentage content of metal carbide is gradually increased from 0% to within 60%, and the mass percentage content of metal is gradually decreased from 100% to within 40%.

In other embodiments of the present application, the intermediate layer 302 may further include diamond-like carbon (DLC). That is, the intermediate layer 302 at this time is a mixed layer including a metal material, its carbide, and diamond-like carbon. DLC is an amorphous metastable carbon material with high hardness, low friction, high thermal conductivity and high light transmittance. The intermediate layer 302 at this time can better provide a stress buffer between the primer layer 301 and the diamond-like carbon layer 303 . The diamond-like carbon may be distributed in the entire thickness direction of the intermediate layer 302 , or may be distributed only in a certain thickness range of the intermediate layer 302 . In some embodiments, from the component substrate 10 upward, the intermediate layer 302 may be a mixed layer of both metal and metal carbide, and then a mixed layer of metal and metal carbide and diamond-like carbon.

In some embodiments of the present application, the mass percentage of diamond-like carbon in the intermediate layer 302 also increases gradually in the direction from the component base 10 to the infiltration layer 20 . In this way, the composition, elastic modulus, hardness and thermal expansion coefficient of the intermediate layer 302 can be distributed in a gradient from top to bottom, and there is no interface with sudden composition changes, so that the internal stress of each sandwich structure of the wear-resistant composite coating can be greatly reduced. And help to improve the film-based bonding strength of the wear-resistant composite coating.

In the embodiments of the present application, the material composition, thickness, and formation method of each metal base layer 301 and each intermediate layer 302 may be the same or different. The thickness and formation method of each diamond-like layer 303 may be the same or different. Wherein, the thickness of each primer layer 301 can be independently in the range of 0.05 μm-3 μm. The thickness of each intermediate layer 302 is independently in the range of 0.05 μm-1 μm. The thickness of each diamond-like layer 303 is independently in the range of 0.05 μm-5 μm.

In some embodiments of the present application, in the direction from the component base 10 to the infiltration layer 20, in the above wear-resistant composite coating, the thickness of the diamond-like layer farthest from the infiltration layer 20 may be greater than that of other diamond-like layers. At this time, the outermost side of the above-mentioned component is the diamond-like carbon layer with the thickest thickness, which can significantly improve the wear resistance of the component, so that it can be better applied to scenarios with high hardness and high wear resistance requirements. In some embodiments, the thickness of the diamond-like carbon layer farthest from the permeation layer 20 is 0.05 μm-5 μm, and the thickness of other diamond-like carbon layers is 0.05 μm-1.5 μm.

In some embodiments of the present application, among the two diamond-like carbon layers in any two adjacent sandwich structures, the thickness of the diamond-like carbon layer far from the infiltration layer 20 is greater than the thickness of the diamond-like carbon layer near the infiltration layer 20 . In other words, from the component base 10 to the infiltrating layer 20, the wear-resistant composite coating sequentially includes the first sandwich structure 31, the second first sandwich structure 32... to the nth sandwich structure 3n (n represents the number of sandwich structures) , where the thickness of the diamond-like carbon layer in the mth sandwich structure is greater than the thickness of the diamond-like carbon layer in the m-1th sandwich structure, and m is any value from 2 to n. In this embodiment, among the multiple diamond-like carbon layers, the thickness of the single diamond-like carbon layer 303 increases sequentially from bottom to top, so that even after the thickest diamond-like carbon layer on the topmost layer is worn away, It will be the diamond-like carbon layer with the second thickness. A wear-resistant composite coating with such DLC thickness characteristics can significantly improve its wear resistance and service life with the smallest increase in the space ratio of the component.

In the embodiments of the present application, the above n (ie, the number of interlayer structures) may be an integer between 3 and 40. For example, n can be 4, 5, 6, 8, 10, 15, 20, 25, 30, 35, or 38, etc. A larger n can make the thickness of the wear-resistant composite coating thicker and the wear resistance more excellent, which is beneficial to the improvement of the service life of the components.

In the embodiment of the present application, the thickness of the above-mentioned wear-resistant composite coating may be 4.5 μm-60 μm. Thicker wear-resistant composite coatings can significantly improve the wear resistance and service life of components. In some embodiments, the thickness of the wear resistant composite coating may be 10 μm-60 μm. In the embodiment of the present application, the Vickers hardness of the wear-resistant composite coating may be greater than or equal to 1200HV. In some embodiments, the Vickers hardness of the wear resistant composite coating may be greater than or equal to 1500 HV, or greater than or equal to 1800 HV.

In the embodiment of the present application, the above-mentioned component base 10 includes a mold, a tool, a rotating shaft component or other components (such as a slideway, etc.). Among them, the shaft components include shaft cams, shaft gears, and the like. The above-mentioned mold may be a stamping mold, a die-casting mold, or the like. For die-casting molds, according to the type of material to be die-cast, die-casting molds can be divided into die-casting aluminum alloy molds, die-casting magnesium alloy molds, die-casting zinc alloy molds, die-casting high-entropy alloy molds, and die-casting zirconium-based amorphous molds.

In the above-mentioned high wear-resistant component provided by the embodiment of the present application, an infiltration layer and a thick and hard wear-resistant composite coating are sequentially arranged on the component substrate. The wear-resistant composite coating includes at least two layers consisting of a metal base layer and an intermediate layer. - Sandwich structure of diamond-like layer, the wear-resistant composite coating has extremely low internal stress and large film-base bonding force, which can endow the component with excellent wear resistance and long life without affecting the space ratio of the component. service life. The component is used to prepare the structural parts of the terminal product, which can realize the small volume of the terminal product while taking into account the reliability and improve the competitiveness of the product.

Correspondingly, the embodiment of the present application also provides a preparation method of the above-mentioned high wear-resistant component, including:

S01, forming an infiltration layer on the surface of the component base, and then performing a smoothing treatment on the surface of the infiltration layer; wherein, the material of the component base includes a steel base material;

S02, sequentially depositing a metal primer layer, an intermediate layer and a diamond-like carbon layer on the infiltrating layer to obtain a sandwich structure, wherein the intermediate layer is a mixed layer comprising metal and metal carbide;

S03. Prepare at least one sandwich structure by redepositing according to the above step S02 to form a wear-resistant composite coating including at least two stacked sandwich structures to obtain a highly wear-resistant component.

In the embodiment of the present application, in step S01 , before forming the infiltration layer on the surface of the component substrate, the component substrate further includes smoothing pretreatment to remove oil stains, dirt, oxide layers, etc. on its surface. Wherein, the polishing pretreatment may include one or more of polishing treatment, sandblasting treatment, solvent cleaning treatment, glow cleaning treatment, and ion etching cleaning treatment. Optionally, the surface roughness of the component base body after smoothing pretreatment is less than or equal to 1 μm. In an embodiment of the present application, the component substrate is first subjected to polishing treatment, and then to solvent cleaning treatment.

In step S01 , the initial thickness of the infiltration layer formed on the surface of the component substrate may be 10 μm or more. For example, it may be 15 μm or more. The formation method of the infiltration layer can be a plasma infiltration process, and the treatment temperature is relatively low, which is basically below the tempering temperature of the steel substrate (for example, below 420° C.). The formation time of the infiltration layer can be controlled within 20h, for example, 10-16h. Among them, the carbon source used in carburizing can be acetylene, methane, etc., the nitrogen-containing infiltrating agent used in nitriding can be nitrogen, etc., and the boron-containing infiltrating agent used in boronizing can be boron powder, boron-iron alloy powder, etc., The silicon-containing infiltration agent used in the infiltration of silicon can be gaseous silicon tetrachloride, or solid ferrosilicon alloy powder. The mixed powder of boron-containing ferroalloy powder and ferrosilicon alloy powder can be used for boron-silicon infiltration.

After the surface of the infiltration layer is smoothed, only the dense infiltration layer (also referred to as "de-surface infiltration layer") can be left on the component substrate. Taking the carburized layer as an example, after smoothing treatment, a lot of carbon originally contained on the surface can be removed, including the floating carbon formed during the carburizing process, the loose surface carbon solid solution layer and the carbon compound layer. The polishing treatment here can include one or both of polishing and sandblasting. Among them, compared with the glow cleaning and the ion etching cleaning, the removal depth of the smoothing treatment is larger, so as to ensure that the hardness of the infiltrated layer after the treatment is larger. Optionally, the surface removal thickness of the infiltration layer may be 0.5 μm-3 μm.

In the embodiment of the present application, in step S02, the form of the metal primer layer, the intermediate layer and the diamond-like layer can be independently selected from at least one of physical vapor deposition (PVD) and chemical vapor deposition (CVD). Wherein, PVD may include one or more of magnetron sputtering, filtered arc ion plating, non-filtered arc ion plating, radio frequency ion plating, etc., and CVD may include hot wire chemical vapor deposition (HFCVD), plasma enhanced One or more of Chemical Vapor Deposition (PECVD) etc. Among them, the metal base layer is usually formed by PVD, such as magnetron sputtering, so as to form a film layer with a more uniform and dense appearance. In this application, a combination of PVD+PECVD can be used to form the intermediate layer. Wherein, the metal target used in forming the intermediate layer and the metal target used in forming the metal primer may be the same or different.

In an embodiment of the present application, a magnetron sputtering process can be used to form the diamond-like carbon layer. The specific process can be as follows: passing argon gas into the vacuum chamber of the coating equipment, so that the pressure in the vacuum chamber is 0.5-1.0Pa, and the carbon is turned on. The target (eg, graphite target) is used to deposit the DLC layer, and the target power of the carbon target is 1kW-5kW, and the negative bias voltage of the substrate is 50-600V. In other embodiments of the present application, the PECVD process can also be used to form the diamond-like layer,

Specifically, in an embodiment of the present application, in step S02, sequentially depositing and forming a metal primer layer, an intermediate layer and a diamond-like layer on the infiltration layer includes:

Turn on the metal material target, turn on the bias source, and deposit a metal base layer on the dense infiltration layer; then pass the gaseous carbon source into the vacuum chamber of the coating equipment, and gradually increase the gas flow of the gaseous carbon source to form an intermediate layer, Along the thickness growth direction of the intermediate layer, the content of metal in the intermediate layer gradually decreases, and the content of metal carbide gradually increases;

Then, the metal material target is turned off, the gas flow rate of the gaseous carbon source is continuously increased to a constant value, the bias voltage is increased to a constant value, and a diamond-like carbon layer is deposited on the intermediate layer. The intermediate layer formed by this embodiment may be referred to as a mixed layer including a metal primer material and a carbide of the metal primer material. In this embodiment, the resulting intermediate layer contains the same metal element as the metal primer.

The preparation method of the above-mentioned high wear-resistant component provided by the embodiment of the present application has the advantages of simple process, low cost and high production efficiency, and is suitable for industrialized batch preparation. The obtained high wear-resistant component has better coating thickness, hardness and wear resistance.

The embodiment of the present application also provides a structural member, which includes the high wear-resistant member described above in the embodiment of the present application, that is, the structural member may be partially or fully prepared by using the above-mentioned high wear-resistant member.

In the embodiments of the present application, the structural member may be, but is not limited to, a rotating shaft in the end product, and may also be a mold, a tool, and other structural members that require high wear resistance and high hardness in the fields of automobiles and the like. The mold may be a stamping mold, a die-casting mold, or the like. Among them, the die-casting mold can be used to make the middle frame of the mobile phone, the middle plate of the mobile phone, the front shell of the mobile phone, the back cover of the mobile phone, etc.

The above-mentioned rotating shaft may be a rotating shaft in a foldable or clamshell terminal product, and may specifically be a rotating shaft in a foldable mobile phone, a tablet computer, a PC, and the like. In an embodiment of the present application, the rotating shaft 100 may specifically include a main shaft 101 , a rotating shaft gear 102 , a rotating shaft cam 103 , an elastic element 104 (such as a spring) and other components (see FIG. 2 ) sleeved on the main shaft 101 . Wherein, both ends of the rotating shaft 100 may also be provided with limiting elements, supporting elements, and the like, respectively.

The structural parts of the embodiments of the present application include the above-mentioned high wear-resistant components, which can endow the structural parts with excellent wear resistance and long service life, and prepare final products with excellent product competitiveness.

For example, after 150,000 rounds of opening and closing experiments for a folding mobile phone using the rotating shaft of the above-mentioned highly wear-resistant member of the present application, the opening and closing force of the rotating shaft and the reduction degree of the closing force can be controlled within 20%, which can be basically maintained. A certain opening and closing angle, without random swinging.

For example, the service life of a die-casting aluminum alloy mold with the above-mentioned infiltration layer and wear-resistant composite coating can be increased from 80,000 times to more than 100,000 times, such as 100,000-120,000 times, which improves the delivery efficiency and reduces the number of products. cost.

For another example, the ordinary die-casting zirconium-based amorphous alloy mold has a single mold life of less than 15,000 times, and the mold life after the overall face reduction of the mold core is within 30,000 times; The die-casting zirconium-based amorphous alloy mold with composite coating can have a single mold life of 20,000 to 30,000 times, and the mold life after the overall face reduction and reset of the mold core can reach 40,000 to 60,000 times; greatly improving the delivery output and efficiency, reducing product costs. Among them, the overall surface reduction of the mold core refers to the process that the mold can no longer be used after the mold is die-cast (such as being eroded, etc.), and the mold surface is re-machined to remove the original surface, and then the mold is processed.

An embodiment of the present application further provides a terminal, where the terminal includes the above-mentioned structural member in the embodiment of the present application, and a certain weight reduction benefit can be obtained.

Specifically, the terminal may include various handheld devices with wireless communication functions (such as various mobile phones, ipads), vehicle-mounted devices (such as driving recorders), wearable devices (such as smart watches), computing devices (such as notebook computers) ) or other processing equipment connected to a wireless modem, as well as various forms of user equipment (UE), mobile station (MS), terminal device, and the like.

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of the foldable terminal 200 in a certain use state according to an embodiment of the present application. The foldable terminal 200 includes a first body 201 and a second body 202 , wherein the first body 201 and the second body 202 are movably connected through the rotating shaft 100 . One side of the first main body 201 has a first display screen, and one side of the second main body 202 has a second display screen. Part or all of the rotating shaft 100 may be formed of the above-mentioned high wear-resistant components. After the foldable terminal 200 has been opened and closed for more than 100,000 times (ie, the number of wear-resistant times the rotating shaft 100 has experienced), the difference between the opening and closing force of the rotating shaft and the closing force is determined. The wear reduction (expressed as force value) remains within the industry acceptable 20%.

The embodiments of the present application will be further described below in terms of multiple specific embodiments. The embodiments of the present application are not limited to the following specific embodiments.

Example 1

A high wear-resistant die-casting mold, the preparation method of which comprises the following steps:

(1) Die-casting mold cavity matrix: Using 8407 mold steel as raw material, it is formed by die-casting process to obtain die-casting mold cavity matrix. Its chemical composition and its weight percentage are as follows: C0.38%, Mn0.4%, Cr 5.3% , Si1%, Mo1.3%, V 0.9%, the balance is Fe and inevitable impurities;

(2) After polishing the above-mentioned mold cavity substrate, washing off oil stains, etc., put it in a plasma vacuum furnace, pass nitrogen gas, heat the furnace cavity temperature to 400°C, and apply a voltage of 600V to form a glow discharge in the furnace cavity. , Nitriding was carried out under these conditions for 6 hours, and then cooled to room temperature to form a nitriding layer with a thickness of 6 μm. The Vickers hardness of this nitriding layer gradually increased from the surface of the substrate upwards, from 200HV to 1150HV;

Then, the formed nitriding layer is polished to a depth of 0.5-1 μm, so as to remove nitrogen with a large content in the surface layer to obtain a dense nitriding layer, and the surface roughness of the dense nitriding layer Ra≤1 μm;

(3) The above-obtained component substrate with a dense nitriding layer is placed in the furnace cavity of the PVD and PECVD composite furnace, and argon gas is first introduced into the furnace, the negative bias is turned on to 600V, and the substrate is bombarded with argon ions Surface for 30 minutes to further remove impurities and loose structures on the surface of the nitriding layer to provide a better substrate for the next coating; then turn off the negative bias;

(4) Turn on the Cr target, turn on the negative bias voltage to 200V, and enter into the deposition of pure Cr to obtain a Cr layer with a thickness of 200 nm;

(5) Pour acetylene into the furnace, and gradually increase the gas flow of acetylene from 30 sccm to 300 sccm at a rate of 2 sccm/min to obtain an intermediate layer with a thickness of 0.75 μm; wherein, from the substrate upward, the Cr in the intermediate layer is The mass percentage content is gradually decreased from 100% to 50%, and the mass percentage content of CrC is gradually increased from 0 to 50%; the total mass concentration of CrC in the intermediate layer is 20%, and the total mass concentration of Cr is 80%;

(6) Turn off the Cr target, gradually increase the gas flow of acetylene, increase the negative bias voltage to 600V, and enter the deposition of the DLC film layer. The thickness of the DLC is 0.25 μm. The total thickness of the sandwich structure is 1.2 μm;

(7) repeating the above steps (4) (5) and (6) multiple times in turn, and the number of cycles n is 12 times to form a wear-resistant composite coating with an arrangement form of (Cr layer-intermediate layer-DLC layer) _n , A high wear-resistant die-casting mold cavity is obtained, wherein the total thickness of the wear-resistant composite coating is 14.4 μm, and the Vickers hardness is above 1200HV. The high wear-resistant die-casting mold cavity of Example 1 of the present application can be used to prepare a middle frame of a mobile phone, a middle plate of a mobile phone, and the like.

Example 2

A highly wear-resistant rotating shaft cam member, the preparation method of which comprises the following steps:

(1) Rotary shaft cam component base: 420 stainless steel is used as raw material, and MIM metal injection process is used to form MIM420 stainless steel cam components. Its chemical composition and its weight percentage are as follows: C0.16-0.25%, Mn≤1%, Cr12 -14%, Si≤1%, Ni≤0.75%, S≤0.03%, P≤0.04%, the balance is Fe and inevitable impurities;

(2) After the above-mentioned component base is polished, washed off oil, etc., placed in a plasma vacuum furnace, acetylene gas is introduced, the temperature of the furnace cavity is heated to 410 ° C, and a voltage of 600 V is applied to form a glow discharge in the furnace cavity, Carburizing was carried out under this condition for 16 hours, and then cooled to room temperature to form a carburized layer with a thickness of 18 μm. The Vickers hardness of the carburized layer gradually increased from the surface of the substrate upward, from 350HV to 1100HV;

Then, the formed carburized layer is polished, and the polishing depth is 2.5 μm, so as to remove the carbon with a large content in the surface layer to obtain a dense carburized layer, and the surface roughness of the dense carburized layer Ra≤1 μm;

(3) The above-obtained component substrate with a dense carburized layer is placed in the furnace chamber of the physical vapor deposition (PVD) equipment, first, argon gas is first introduced into the PVD furnace, the negative bias is turned on to 600V, and argon is used. Ions bombard the surface of the substrate for 30 minutes to further remove impurities and loose structures on the surface of the carburized layer, providing a better substrate for the next coating; then turn off the negative bias;

(4) Turn on the Ti target, turn on the negative bias voltage to 150V, and enter the deposition of pure Ti to obtain a Ti layer with a thickness of 280nm;

(5) Pour acetylene into the PVD furnace, and gradually increase the gas flow of acetylene from 30 sccm to 300 sccm at a rate of 2 sccm/min to obtain an intermediate layer with a thickness of about 0.92 μm; wherein, from the substrate upward, in the intermediate layer The mass percentage of Ti gradually decreases from 100% to 60%, and the mass percentage of TiC gradually increases from 0 to 40%; in the intermediate layer, the total mass concentration of TiC is about 16%, and the total mass concentration of Ti is about is 84%;

(6) Turn off the Ti target, gradually increase the air flow of acetylene, increase the negative bias to 600V, and enter the deposition of the DLC film layer. The thickness of the DLC is 0.3 μm. At this time, the Ti layer + the intermediate layer + the DLC layer is formed The total thickness of the sandwich structure is 1.5 μm;

(7) repeating the above steps (4) (5) and (6) multiple times in turn, and the number of cycles n is 40 times to form a wear-resistant composite coating with an arrangement form of (Ti layer-intermediate layer-DLC layer) _n , A highly wear-resistant rotating shaft cam member is obtained, wherein the total thickness of the wear-resistant composite coating is 60 μm, and the Vickers hardness is above 1500HV.

Example 3

A highly wear-resistant rotating shaft gear member, the preparation method of which comprises the following steps:

(1) The base of the rotating shaft gear component of the folding mobile phone: using 17-4 stainless steel as the raw material, it is formed by MIM metal injection process to form the MIM 17-4 stainless steel gear components. Its chemical composition and its weight percentage are as follows: C≤0.07%, Mn≤1%, Cr 15.5-17.5%, Si≤1%, Ni3-5%, S≤0.03%, P≤0.04%, Cu 3-5%, Nb+Ta: 0.15%-0.45%, the balance is Fe and inevitable impurities;

(2) After polishing the above-mentioned component substrate, washing off oil stains, etc., place it in a plasma vacuum furnace, pass acetylene gas and nitrogen gas, heat the furnace chamber temperature to 390°C, and apply a voltage of 600V to form a glow in the furnace chamber. Discharge, nitriding and carburizing were carried out under these conditions for 10 hours, and then cooled to room temperature to form a carbonitriding layer with a thickness of 10 μm. The Vickers hardness of the carbonitriding layer gradually increased from the surface of the substrate upward, from 350HV to 1100HV;

Then, the formed carbonitriding layer is polished, and the polishing depth is 1.5 μm, so as to remove carbon and nitrogen with a large content in the surface layer to obtain a dense carbonitriding layer. The surface roughness Ra of the dense carbonitriding layer is Ra. ≤1μm;

(3) placing the above-obtained component substrate with the dense carbonitriding layer in the furnace chamber of the physical vapor deposition (PVD) equipment, first feeding argon into the PVD furnace, and turning on the negative bias to 600V, Argon ions were used to bombard the surface of the substrate for 30 minutes to further remove impurities and loose structures on the surface of the carbonitriding layer to provide a better substrate for the next coating; then turn off the negative bias;

(4) Turn on the W target, turn on the negative bias voltage to 150V, and enter the deposition of pure W to obtain a W layer with a thickness of 300 nm;

(5) Pour acetylene into the PVD furnace, and gradually increase the gas flow of acetylene from 30 sccm to 300 sccm at a rate of 2 sccm/min to obtain an intermediate layer with a thickness of about 0.94 μm; wherein, from the substrate upward, in the intermediate layer The mass percentage of W is gradually decreased from 100% to 55%, and the mass percentage of WC is gradually increased from 0 to 45%; in the intermediate layer, the mass concentration of WC is 22%, and the total mass concentration of W is 78% ;

(6) Turn off the W target, gradually increase the gas flow of acetylene, increase the negative bias voltage to 600V, and enter the deposition of the DLC film layer. The thickness of the DLC is 0.26 μm. At this time, the W layer + the intermediate layer + the DLC layer constitutes The total thickness of the sandwich structure is 1.5 μm;

(7) Repeat the above steps (4) (5) (6) for several times in turn, and the number of cycles n is 3-40 times to form a wear-resistant composite coating with an arrangement of (W layer-intermediate layer-DLC layer) _n layer to obtain a highly wear-resistant rotating shaft gear component, wherein the total thickness of the wear-resistant composite coating is 4.5 μm-60 μm, and the Vickers hardness is above 1500HV.

Example 4

A highly wear-resistant rotating shaft cam member, the preparation method of which comprises the following steps:

(1) Rotary shaft cam member base: take 420 stainless steel as raw material, and use MIM metal injection process to form MIM420 stainless steel cam parts, and its chemical composition and its weight percentage are the same as in Example 2;

(2) After the above-mentioned component base is polished, washed off oil, etc., placed in a plasma vacuum furnace, acetylene gas is introduced, the temperature of the furnace cavity is heated to 410 ° C, and a voltage of 600 V is applied to form a glow discharge in the furnace cavity, Carburizing was carried out under this condition for 16 hours, and then cooled to room temperature to form a carburized layer with a thickness of 18 μm. The Vickers hardness of the carburized layer gradually increased from the surface of the substrate upward, from 350HV to 1100HV;

Then, the formed carburized layer is polished, and the polishing depth is 2.5 μm, so as to remove the carbon with a large content in the surface layer to obtain a dense carburized layer, and the surface roughness of the dense carburized layer Ra≤1 μm;

(3) The above-obtained component substrate with a dense carburized layer is placed in the furnace chamber of the physical vapor deposition (PVD) equipment, first, argon gas is first introduced into the PVD furnace, the negative bias is turned on to 600V, and argon is used. Ions bombard the surface of the substrate for 30 minutes to further remove impurities and loose structures on the surface of the carburized layer, providing a better substrate for the next coating; then turn off the negative bias;

(4) Turn on the Cr target, turn on the negative bias voltage to 150V, then turn on the Ti target, then turn off the Cr target, enter the deposition of pure Ti, and obtain the bottoming stack of the Cr layer, the CrTi composite layer, and the pure Ti layer in turn, The primer stack has a thickness of 300 nm;

(5) Pour acetylene into the PVD furnace, and gradually increase the gas flow of acetylene from 30 sccm to 300 sccm at a rate of 2 sccm/min to obtain an intermediate layer with a thickness of about 0.9 μm; wherein, from the substrate upward, in the intermediate layer The mass percentage of Ti is gradually decreased from 100% to 60%, and the mass percentage of TiC is gradually increased from 0 to 40%; in the intermediate layer, the mass concentration of TiC is 16%, and the total mass concentration of Ti is 84% ;

(6) Turn off the Ti target, gradually increase the gas flow of acetylene, increase the acetylene bias to 600V, and enter the deposition of the DLC film layer. The thickness of the DLC is 0.3 μm. At this time, the Ti layer + the intermediate layer + the DLC layer is formed The total thickness of the sandwich structure is 1.5 μm;

(7) Repeat the above steps (4) (5) (6) for several times in turn, and the number of cycles n is 3-40 times to form a wear-resistant composite coating with an arrangement of (Ti layer-intermediate layer-DLC layer) _n layer to obtain a highly wear-resistant rotating shaft cam member, wherein the total thickness of the wear-resistant composite coating is 4.5 μm-60 μm, and the Vickers hardness is above 1500HV.

Example 5

A highly wear-resistant rotating shaft cam member, which is similar to Embodiment 2 in that: in the wear-resistant composite coating, the thickness of the topmost DLC layer is larger than that of other DLC layers.

Specifically, the preparation method of the highly wear-resistant rotating shaft cam member includes:

Steps (1)-(6) are the same as those in Example 2, and the thickness of the formed first sandwich structure is 1.5 μm;

(7) According to the above-mentioned method of forming the first interlayer structure, 39 interlayer structures are deposited and prepared in sequence to obtain a wear-resistant composite coating comprising 40 stacked interlayer structures, and a highly wear-resistant rotating shaft cam member is obtained; wherein, the 40th The thickness of the DLC layer in the sandwich structure is 2 μm, and the thickness of the DLC layer in the first to the 39th sandwich structure is all 0.3 μm.

Example 6

A highly wear-resistant rotating shaft cam member, the preparation method of which comprises the following steps:

(1)-(3) step is with embodiment 2;

(4) Turn on the Ti target, turn on the negative bias voltage to 150V, enter the deposition of pure Ti, and obtain a Ti layer with a thickness of 250nm;

(5) Pour acetylene into the PVD furnace, gradually increase the gas flow of acetylene from 30 sccm to 300 sccm at a rate of 2 sccm/min, and obtain the first intermediate layer, which is a gradient layer of Ti+TiC, which is a bottom-up layer. The Ti content gradually decreases in the direction and the TiC content gradually increases; then the negative bias voltage is gradually increased to 500V, and DLC is deposited to form a second intermediate layer, which is a gradient layer of Ti+TiC+DLC, and the Ti content gradually decreases from the substrate upwards. The contents of TiC and DLC both gradually increased; among them, the total thickness of the intermediate layer was about 0.95 μm. In the total intermediate layer, the total mass concentration of TiC was about 30%, and the total mass concentration of Ti was about 62%. The total mass concentration is about 8%;

(6) Turn off the Ti target, gradually increase the air flow of acetylene, increase the negative bias voltage to 600V, enter the deposition of the DLC film layer, and obtain a DLC layer with a thickness of 0.3 μm. At this time, the Ti layer + intermediate layer + DLC The thickness of the first sandwich structure composed of layers is 1.5 μm;

(7) Repeating the above steps (4) (5) and (6) several times in order to form a wear-resistant composite coating including 40 above-mentioned sandwich structures to obtain a highly wear-resistant rotating shaft cam member, wherein the wear-resistant composite coating is The total thickness is 60μm, and the Vickers hardness is above 1500HV.

In order to strongly support the beneficial effects brought by the technical solutions of the embodiments of the present application, the mold cavity obtained in Example 1 is used for die casting aluminum alloys or die casting zirconium-based amorphous alloys to test the service life of the molds respectively. The highly wear-resistant components of Examples 2-6 were respectively made into rotating shafts of a folding mobile phone (wherein, each part of the rotating shaft had a permeable layer and a corresponding high-wear-resistant coating), and each rotating shaft was assembled into a folding mobile phone. 150,000 rounds of opening and closing tests were performed on each folding mobile phone (one opening and one closing is one round), and the opening and closing force of the rotating shaft and the wear reduction of the closing force (expressed as force value) were tested.

It was found that, compared with the mold base only after nitriding treatment, the high wear-resistant die-casting mold provided in Example 1 of the present application can increase the mold life from 80,000 times to 100,000 times when die-casting aluminum alloys; When using zirconium-based amorphous alloys, its die life can be increased from 15,000 times to 25,000 times.

For the folding mobile phone using the rotating shaft of the highly wear-resistant member of Example 2 of the present application, after 100,000 rounds of opening and closing experiments, the opening and closing force of the rotating shaft and the degree of reduction of the closing force are both controlled within 15%, which is basically acceptable. Keep a certain opening and closing angle without swinging at will. On the other hand, for the folding mobile phone made of the highly wear-resistant member of Example 5, after 150,000 rounds of opening and closing tests, the opening and closing force of the rotating shaft and the reduction of the closing force can be controlled within 20%. After 150,000 rounds of opening and closing tests for the folding mobile phone made of the highly wear-resistant member of Example 6, the opening and closing force of the rotating shaft and the reduction degree of the closing force can both be controlled within 15%.

In addition, for the folding mobile phone made of the highly wear-resistant member of Example 3, after 100,000 rounds of opening and closing tests, the opening and closing force of the rotating shaft and the reduction degree of the closing force are both controlled within 18%. After 120,000 rounds of opening and closing tests for the folding mobile phone made of the highly wear-resistant component of Example 4, both the opening and closing force of the rotating shaft and the reduction degree of the closing force can be controlled within 16%.

The above results show that the coating structure of the infiltration layer + wear-resistant composite coating provided by the embodiment of the present application can significantly improve the wear resistance of the component and enhance the competitiveness of the product.

Claims (24)

1. A high-wear-resistance member is characterized by comprising a member base body, and a seeping layer and a wear-resistant composite coating which are sequentially arranged on the member base body, wherein the wear-resistant composite coating comprises at least two stacked sandwich structures along the thickness direction, each sandwich structure comprises a metal priming layer, a diamond-like carbon layer and an intermediate layer clamped between the metal priming layer and the diamond-like carbon layer, and the metal priming layer in each sandwich structure is close to the seeping layer; wherein the intermediate layer is a mixed layer comprising a metal and a carbide of the metal; the material of the component substrate comprises a steel substrate.

2. The high-wear-resistant member according to claim 1, wherein in the intermediate layer, the mass concentration of the carbide of the metal is 5% to 60%, and the mass concentration of the metal is 40% to 95%.

3. The high wear-resistant member as claimed in claim 1 or 2, wherein the mass percentage of said metal in said intermediate layer gradually decreases and the mass percentage of said carbide of said metal gradually increases in a direction from said member base toward said carburized layer.

4. A highly wear resistant member as claimed in any one of claims 1 to 3, wherein said intermediate layer further comprises diamond like carbon.

5. The high wear resistant member according to claim 4, wherein the diamond-like carbon content in said intermediate layer gradually increases in the direction from said member base to said impregnated layer.

6. The high wear member according to any one of claims 1 to 5, wherein the thickness of each intermediate layer is independently in the range of 0.05 μm to 1 μm.

7. The high wear resistant member according to claim 1, wherein each of said diamond-like carbon layers independently has a thickness in the range of 0.05 μm to 5 μm.

8. The high wear resistant member according to claim 7, wherein a thickness of the diamond-like carbon layer farthest from the infiltrated layer in the wear resistant composite coating layer is larger than thicknesses of the other diamond-like carbon layers in a direction from the member substrate to the infiltrated layer.

9. The high wear resistant member according to claim 8, wherein in two of said diamond-like carbon layers in any adjacent two of said sandwich structures, the thickness of the diamond-like carbon layer away from said infiltrated layer is greater than the thickness of the diamond-like carbon layer adjacent to said infiltrated layer.

10. The highly wear resistant member according to claim 1, wherein each of said metal primer layers independently has a thickness in the range of 0.05 μm to 3 μm.

11. The high wear member according to claim 1, wherein the number of the sandwich structures is 3 to 40.

12. The high wear resistant component according to any one of claims 1-11, wherein said wear resistant composite coating has a thickness of 4.5 μm-60 μm.

13. The high wear resistant component of claim 12, wherein said wear resistant composite coating has a vickers hardness of greater than or equal to 1200 HV.

14. The highly wear resistant member as claimed in any one of claims 1 to 13, wherein said carburized layer comprises a carburized layer, a nitrided layer, a carbonitrided layer, a borided layer, a siliconized layer or a borosilicate co-carburized layer.

15. The highly wear resistant member according to claim 14, wherein the surface roughness of the infiltrated layer on the side close to the wear resistant composite coating is less than or equal to 1 μm.

16. The highly wear-resistant member according to claim 15, wherein the infiltrated layer has a thickness of 4 μm to 150 μm; the Vickers hardness of the infiltrated layer is greater than or equal to 900 HV.

17. The highly wear resistant component of claim 1, wherein said metal primer layer comprises one or more of titanium, chromium, tungsten, zirconium, molybdenum, nickel, niobium, copper, aluminum, magnesium, zinc, vanadium, and alloys thereof.

18. The high wear resistant member according to claim 1, wherein said intermediate layer contains the same metal element as in said metal primer layer.

19. The high wear resistant component of claim 1, wherein said steel substrate comprises at least one of carbon steel and alloy steel.

20. The high wear member of claim 1, wherein the member substrate comprises a mold, a cutter, a spindle part, or other parts.

21. A preparation method of a high-wear-resistance component is characterized by comprising the following steps:

(1) forming a permeation layer on the surface of the component substrate, and performing polishing treatment on the surface of the permeation layer; wherein the material of the component substrate comprises a steel substrate;

(2) sequentially depositing and forming a metal bottom layer, an intermediate layer and a diamond-like carbon layer on the infiltrated layer to obtain a sandwich structure, wherein the intermediate layer is a mixed layer comprising metal and carbide of the metal;

(3) preparing at least one sandwich structure according to the step (2) and depositing to form a wear-resistant composite coating comprising at least two stacked sandwich structures, thereby obtaining the high-wear-resistance member.

22. A structural member, characterized in that it comprises a high wear resistant member according to any of claims 1-20.

23. The structural member of claim 22, wherein the structural member comprises a shaft.

24. A terminal, comprising a structural member according to any one of claims 22 to 23.

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