CN119592858A - Diamond and negative expansion particle reinforced aluminum matrix composite material and preparation method thereof - Google Patents
Diamond and negative expansion particle reinforced aluminum matrix composite material and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting
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- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/007—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes with additional metal compounds being nitrides
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- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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Abstract
本发明提供一种金刚石和负膨胀颗粒增强铝基复合材料及制备方法，属于复合材料技术领域。所述铝基复合材料由分散于铝基体中的金刚石相和负热膨胀相组成；金刚石相的平均粒径为10‑1000μm，所述金刚石相的平均粒径与负热膨胀颗粒的平均粒径之比为10～20；与所述金刚石相相邻的负热膨胀颗粒的粒径小于远离所述金刚石相的负热膨胀颗粒的粒径。通过调控金刚石以及负膨胀颗粒的体积分数来获得具有优异热物理性能的金刚石和负膨胀颗粒增强铝基复合材料，通过协同优化策略，制备得到与半导体材料相匹配的热膨胀系数，应用于电子封装散热材料领域。
The present invention provides a diamond and negative expansion particle reinforced aluminum-based composite material and a preparation method, belonging to the technical field of composite materials. The aluminum-based composite material is composed of a diamond phase and a negative thermal expansion phase dispersed in an aluminum matrix; the average particle size of the diamond phase is 10-1000 μm, and the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20; the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than the particle size of the negative thermal expansion particles away from the diamond phase. Diamond and negative expansion particle reinforced aluminum-based composite materials with excellent thermophysical properties are obtained by regulating the volume fractions of diamond and negative expansion particles, and a thermal expansion coefficient matching that of semiconductor materials is prepared through a collaborative optimization strategy, which is applied to the field of electronic packaging heat dissipation materials.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a diamond and negative expansion particle reinforced aluminum-based composite material and a preparation method thereof.
Background
Conventional metal matrix composites have a mismatch in thermal expansion coefficients with semiconductor materials such as silicon, germanium, gallium nitride, etc., and temperature variation is a serious problem in electronic packaging, aerospace, and optical devices, which causes thermal stress, and when the thermal expansion coefficient of the material is mismatched with the surrounding environment, the temperature variation causes stress to occur inside the material, causing cracks and fractures to occur. The negative expansion material can effectively solve the problem of thermal stress, and can provide thermal expansion characteristics opposite to those of surrounding materials, so that the thermal stress between the materials is reduced and even offset, and the reliability and durability of the whole structure are improved.
The diamond has high hardness, chemical stability, high light transmittance and isotropic heat conductivity, the heat conductivity can reach 2000W/mK, and the thermal expansion coefficient is only 1.5 multiplied by 10 -6/K, so the diamond is an ideal heat dissipation material. The diamond particles synthesized by the artificial synthesis in recent years have the characteristics of simple process, low cost and the like, and become an ideal metal matrix composite reinforcement. The negative expansion particles have large thermal expansion coefficient regulation range and excellent negative expansion performance, and can inhibit the positive thermal expansion coefficient of the metal matrix, so as to obtain the composite material with lower thermal expansion coefficient. The metal aluminum and aluminum alloy have the characteristics of good processability, mechanical property, higher heat conductivity and the like. Both negative expansion particle reinforced aluminum matrix composites and diamond reinforced aluminum matrix composites have been reported, but there is room for optimization in the regulation of these composites properties. The interface reaction between diamond and aluminum matrix can lead to weak bonding capacity at the interface of the composite material and severely limit the thermophysical performance of the composite material, on the other hand, interface gaps are easy to form at the interface in the cooling process, so that larger interface thermal resistance is formed, the effective heat conduction of the composite material is affected, the compactness of the composite material is reduced, and the regulation and control interval of the thermal expansion coefficient of the composite material is limited. The Chinese patent publication No. CN114411010A discloses a manufacturing method of a low-expansion diamond reinforced aluminum-based composite material, however, the thermal expansion coefficient of the composite material is as high as 6ppm, and the thermal expansion coefficient of the composite material is still different from that of a Si chip. In addition, advanced semiconductor materials are fast in hot start and high in cycle times, and devices are cracked due to mismatching of packaging materials and thermal expansion of chips. Therefore, the preparation of the negative expansion and diamond hybrid reinforced aluminum-based composite material has higher heat conductivity and lower thermal expansion coefficient, increases the regulation and control interval of the thermal expansion coefficient of the composite material, and has important scientific and engineering significance.
Disclosure of Invention
In order to solve the problems, the invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method thereof, wherein the diamond and negative expansion particle reinforced aluminum matrix composite with excellent thermophysical properties is obtained by regulating and controlling the volume fraction of diamond and negative expansion particles, and the thermal expansion coefficient matched with a semiconductor material is prepared by a collaborative optimization strategy and is applied to the field of electronic packaging heat dissipation materials.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
In one aspect, the invention provides a diamond and negative expansion particle reinforced aluminum-based composite material, which consists of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix, wherein the average particle size of the diamond phase is 10-1000 mu m, the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20, and the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than the particle size of the negative thermal expansion particles far away from the diamond phase.
Further, the volume fraction of the diamond phase is 30-80%, the volume fraction of the negative thermal expansion ceramic phase is 10% -40%, and the volume fraction of the aluminum matrix is at least 10%.
Further, the negative thermal expansion phase is one or more of ZrW2O8、Cu2P2O7、Cu2V2O7、PbTiO3、ZrMo2O8、Mn3Zn1- xSnxN or Mn 3Zn1-xGex N, 0< x <1.
Further, the aluminum matrix is pure aluminum or aluminum alloy.
Further, the negative thermal expansion particles adjacent to the diamond have a particle size range of not more than 0.5 μm.
On the other hand, the invention provides a preparation method of the diamond and negative expansion particle reinforced aluminum matrix composite material, which comprises the steps of weighing diamond powder, negative thermal expansion particles and aluminum matrix material according to a proportion, mixing the diamond powder and the negative thermal expansion particles, placing the mixture in a graphite mold, compacting the mixture, placing the aluminum matrix material above the graphite mold, carrying out vacuum heating and melting on the graphite mold, carrying out pressurizing and heat-preserving treatment after preserving heat for a preset time, and cooling after the pressurizing and heat-preserving treatment is finished.
Further, the average grain size of the diamond powder is 10-1000 mu m, and the ratio of the average grain size of the diamond phase to the average grain size of the negative thermal expansion particles is 10-20.
Further, the negative thermal expansion particles have a D5 of not more than 0.5 μm.
Further, the vacuum heating process is that the vacuum degree of a smelting furnace is less than or equal to 1Pa, the heating speed is 20-80 ℃ per minute, and the temperature is kept for 20-70 minutes at the temperature of Tm-Tm+150 ℃, wherein Tm is the melting point of an aluminum substrate.
Further, the pressurizing and heat-preserving treatment process comprises the steps of pressurizing to 0.5-2.5 mpa by adopting inert gas, and preserving heat and pressure for 10-60 min at the temperature of Tm-Tm+150 ℃, wherein Tm is the melting point of the aluminum matrix.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
1. According to the invention, diamond and negative thermal expansion particles are mixed, so that the thermal expansion performance of the composite material is effectively reduced, and the interface binding force is increased. The base metal is pure aluminum or aluminum alloy, so that the composite material maintains good mechanical property and heat conductivity. In the compounding process, the negative thermal expansion particles also inhibit the expansion of the aluminum matrix, so that the phenomenon that the thermal expansion coefficients of diamond and the aluminum matrix are not matched is improved, and the thermal expansion coefficient of the diamond aluminum composite material is further reduced.
2. According to the invention, through the air pressure infiltration process, the solid phase mixed reinforcement and the solid phase metal matrix are kept in full contact under high pressure, the aluminum matrix is melted at high temperature, so that the melted aluminum matrix is fully pressed into the pores of the diamond and the negative thermal expansion particles, and the high compactness of the diamond hybrid negative thermal expansion particles/aluminum matrix composite material is ensured. Meanwhile, the preparation process can control the infiltration temperature, pressure and time, and avoid interface reaction between two phases to the greatest extent. Due to the high compactness of the prepared composite material, the preparation process can solve the problems of internal porosity, air holes and the like of the composite material prepared by other processes. Due to the vacuum condition, the oxidation phenomenon of aluminum metal in the reaction process can be effectively avoided, and the purity of the prepared negative thermal expansion particle and diamond hybrid reinforced aluminum-based composite material is ensured. Under the high pressure condition, the heat preservation and pressure maintaining can ensure that the interface combination between the metal and the diamond negative thermal expansion particles is firmer, and the elastic modulus and the strength of the obtained negative thermal expansion particles and diamond hybrid reinforced aluminum-based composite material are increased.
3. The synthesis process of the negative thermal expansion particle and diamond hybrid reinforced aluminum-based composite material is simple and flexible, the investment cost of the used equipment is low, the preparation process is simple and convenient, the raw material price is low, the sources of matrix pure aluminum or aluminum alloy are wide and easy to obtain, the cost is low, and the composite material has very wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an SEM image of a diamond and negative expansion particle-reinforced aluminum matrix composite material prepared in example 1 of the present invention;
Fig. 2 is a thermal expansion curve of the diamond and negative expansion particle reinforced aluminum matrix composite material prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The embodiment of the invention provides a diamond and negative expansion particle reinforced aluminum-based composite material, which consists of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix, wherein the average particle size of the diamond phase is 10-1000 mu m, the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20, and the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than the particle size of the negative thermal expansion particles far away from the diamond phase.
According to the application, the diamond phase and the negative thermal expansion are adopted to strengthen the aluminum matrix, the diamond phase has high heat conductivity and low expansion coefficient, but the diamond and aluminum matrix are compounded to have corresponding problems, the interface between the diamond phase and the aluminum matrix in the prepared composite is easy to generate cracks in the subsequent deformation process due to poor wettability of the diamond and the aluminum matrix, the diamond surface is generally treated to improve the bonding strength between the diamond phase and the aluminum matrix in the prior art, the wettability between the aluminum matrix and the surface of the diamond particle can be improved by adding the negative thermal expansion particles with a certain particle size, on the other hand, the negative thermal expansion particles and the aluminum matrix are compounded to have corresponding problems, and because the negative thermal expansion particles and the aluminum matrix have opposite expansion coefficients, the negative thermal expansion particles and the aluminum matrix in the prepared composite have larger stress, when the local stress exceeds the maximum allowable stress at the position, the cracks appear, the negative thermal expansion particles cannot form effective traction on the aluminum matrix, the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than the negative thermal expansion particles with the particle size far away from the phase, and the negative thermal expansion particles with the aluminum phase are more than the negative thermal expansion particles with the negative thermal expansion particles and the aluminum phase, and the thermal expansion particles are more in a harmonious reaction with the negative thermal expansion particles 4C3 is generated, and the thermal expansion of the negative expansion particles and the aluminum phase is more in thermal expansion phase between the negative phase and the aluminum phase is more stable.
Specifically, the volume fraction of the diamond phase is 30-80%, the volume fraction of the negative thermal expansion ceramic phase is 10-40%, and the volume fraction of the aluminum matrix is at least 10%.
Specifically, the negative thermal expansion phase is one or more of ZrW2O8、Cu2P2O7、Cu2V2O7、PbTiO3、ZrMo2O8、Mn3Zn1-xSnxN or Mn 3Zn1-xGex N, 0< x <1. Illustratively, the negative expansion particles of the present application employ ZrW 2O8 and Cu 2P2O7.
Specifically, the aluminum matrix is pure aluminum or aluminum alloy. Aluminum alloys include, but are not limited to, al-Mg, al-Mn, al-Si-Mg, al-Mg-Zn-Cu.
Specifically, the negative thermal expansion particles adjacent to the diamond have a particle diameter range of not more than 0.5 μm. The particle size of the negative thermal expansion particles influences the wettability of the negative thermal expansion particles on the surface of the aluminum liquid and the diamond, and influences the generation of Al 4C3, so that the deformation coordination capacity of the diamond phase, the aluminum matrix and the negative thermal expansion phase at the interface position is influenced, and the negative thermal expansion particles are limited in the range, so that the effects can be realized.
The embodiment of the invention also discloses a preparation method of the diamond and negative expansion particle reinforced aluminum matrix composite, which comprises the following steps:
And S1, weighing diamond powder, negative thermal expansion particles and aluminum matrix material according to the proportion. The aluminum matrix material is aluminum beans or aluminum blocks, and D5 of the negative thermal expansion particles is not more than 0.5 mu m.
S2, mixing the diamond powder with the negative thermal expansion particles, then placing the mixture in a graphite mold, vibrating the mixture, and placing the aluminum matrix material above the graphite mold. Specifically, the material mixing can be carried out in a ball milling mode, the ball milling time is not too long, the ball milling speed is 200-300r/min, and the ball milling time is not more than 10 min.
And S3, carrying out vacuum heating melting on the graphite mold, and carrying out pressurizing heat preservation treatment after preserving heat for a preset time.
The vacuum heating process is that the vacuum degree of the smelting furnace is less than or equal to 1Pa, the heating speed is 20-80 ℃ per minute, and the temperature is kept for 20-70 minutes at the temperature of Tm-Tm+150 ℃, wherein Tm is the melting point of the matrix aluminum particles.
The pressurizing and heat-preserving treatment process comprises the steps of pressurizing to 0.5-2.5 mpa by inert gas, and preserving heat and pressure for 10-60 min at Tm-Tm+150 ℃, wherein Tm is the melting point of matrix aluminum particles.
And S4, cooling after the supercharging heat preservation treatment is finished.
The preparation method can prepare the negative thermal expansion particles adjacent to the diamond phase, wherein the particle size of the negative thermal expansion particles is smaller than that of the negative thermal expansion particles far away from the diamond phase, and the preparation method has the principle that after an aluminum matrix material is melted, the negative thermal expansion particles enter gaps between diamond powder and the negative thermal expansion particles, small-size negative thermal expansion particles are preferentially gathered on the surface of aluminum liquid, and are brought to the surface of the diamond powder with high probability along with the flowing of the aluminum liquid, so that the surface modification of the diamond is realized, and meanwhile, the stress among three phases is coordinated.
In order to better illustrate the embodiments of the present invention, the present invention will be described in further detail by way of specific examples.
Example 1
The embodiment of the invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method thereof, wherein the preparation method comprises the following steps:
S1, weighing diamond powder, zrW 2O8 particles and pure aluminum. Wherein the volume fraction of the diamond powder is 50%, the volume fraction of ZrW 2O8 particles is 25%, and the rest is pure aluminum, the average particle size of the diamond powder is 100 μm, the average particle size of the ZrW 2O8 particles is 9.5 μm and D5 is 0.4 μm.
S2, mixing the diamond powder with ZrW 2O8 particles, then placing the mixture in a graphite mold, compacting, and placing the pure aluminum above the graphite mold.
And S3, carrying out vacuum heating melting on the graphite mold, and carrying out pressurizing heat preservation treatment after preserving heat for a preset time.
The vacuum heating process is that the vacuum degree of the smelting furnace is less than or equal to 1Pa, the heating speed is 40 ℃ per minute, and the temperature is kept at 670 ℃ for 30 minutes.
The pressurizing and heat-preserving treatment process comprises the steps of pressurizing to 1.5Mpa by inert gas, and preserving heat and pressure for 30min at 670 ℃.
And S4, cooling after the supercharging heat preservation treatment is finished.
The appearance of the prepared aluminum-based composite material is shown in figure 1, black is a diamond phase, white is a ZrW 2O8 phase, gray is pure aluminum, and the prepared diamond and negative expansion particle reinforced aluminum-based composite material is compact in structure, the size of a negative thermal expansion phase adjacent to the diamond phase is small, and no crack exists at a three-phase interface.
As shown in FIG. 2, the red color is pure aluminum linear expansion coefficient, and it can be seen that the thermal conductivity of the aluminum-based composite material prepared in this example can be greatly reduced, and the thermal expansion coefficient of the aluminum-based composite material prepared in this example is 2.5X10 -6/K.
Example 2
The embodiment of the invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method thereof, wherein the preparation method comprises the following steps:
S1, weighing diamond powder, zrW 2O8 particles and pure aluminum. Wherein the volume fraction of the diamond powder is 30%, the volume fraction of ZrW 2O8 particles is 10%, and the balance is pure aluminum, the average particle size of the diamond powder is 10 μm, the average particle size of the ZrW 2O8 particles is 1 μm and D5 is 0.1 μm.
S2, mixing the diamond powder with ZrW 2O8 particles, then placing the mixture in a graphite mold, compacting, and placing the pure aluminum above the graphite mold.
And S3, carrying out vacuum heating melting on the graphite mold, and carrying out pressurizing heat preservation treatment after preserving heat for a preset time.
The vacuum heating process is that the vacuum degree of the smelting furnace is less than or equal to 1Pa, the heating speed is 20 ℃ per minute, and the temperature is kept at 670 ℃ for 20 minutes.
The pressurizing and heat preserving process includes pressurizing inert gas to 0.5MPa, and maintaining at 670 deg.c for 10min.
And S4, cooling after the supercharging heat preservation treatment is finished.
The prepared diamond and negative expansion particle reinforced aluminum matrix composite material has compact structure, the size of a negative thermal expansion phase adjacent to the diamond phase is small, and no crack exists at a three-phase interface.
The thermal conductivity of the prepared aluminum-based composite material is 535W/(m.K) and the thermal expansion coefficient is 5.2 multiplied by 10 -6/K.
Example 3
The embodiment of the invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method thereof, wherein the preparation method comprises the following steps:
S1, weighing diamond powder, zrW 2O8 particles and pure aluminum. Wherein the volume fraction of the diamond powder is 70%, the volume fraction of ZrW 2O8 particles is 10%, and the rest is pure aluminum, the average particle size of the diamond powder is 900 μm, the average particle size of the ZrW 2O8 particles is 50 μm and D5 is 0.5 μm.
S2, mixing the diamond powder with ZrW 2O8 particles, then placing the mixture in a graphite mold, compacting, and placing the pure aluminum above the graphite mold.
And S3, carrying out vacuum heating melting on the graphite mold, and carrying out pressurizing heat preservation treatment after preserving heat for a preset time.
The vacuum heating process is that the vacuum degree of the smelting furnace is less than or equal to 1Pa, the heating speed is 80 ℃ per minute, and the temperature is kept for 70 minutes at 670 ℃.
The pressurizing and heat preserving process includes pressurizing inert gas to 2.5MPa, and maintaining at 670 deg.c for 60min.
And S4, cooling after the supercharging heat preservation treatment is finished.
The prepared diamond and negative expansion particle reinforced aluminum matrix composite material has compact structure, the size of a negative thermal expansion phase adjacent to the diamond phase is small, and no crack exists at a three-phase interface.
The thermal conductivity of the prepared aluminum-based composite material is 694W/(m.K) and the thermal expansion coefficient is 3.1X10 -6/K.
Example 4
Unlike example 1, in step S1 of this example, the average particle diameter of Cu 2P2O7 particles was 10 μm and D5 was 0.1 μm.
The prepared diamond and negative expansion particle reinforced aluminum matrix composite material has compact structure, the size of a negative thermal expansion phase adjacent to the diamond phase is small, and when the rolling reduction is 20%, no crack appears at a three-phase interface.
The thermal conductivity of the prepared aluminum-based composite material is 526W/(m.K) and the thermal expansion coefficient is 3.19 multiplied by 10 -6/K.
Comparative example 1
Unlike example 1, in step S1 of this comparative example, the D5 of the ZrW 2O8 particles was 0.7. Mu.m.
When the rolling reduction rate of the prepared diamond and negative expansion particle reinforced aluminum matrix composite material is 20%, cracks are generated between the diamond phase and the aluminum matrix. When the D5 particle diameter is large, the surface of diamond cannot be effectively modified, resulting in poor bonding ability of diamond phase to aluminum matrix.
Comparative example 2
Unlike example 1, in step S1 of this comparative example, the average particle diameter of the diamond powder was 100. Mu.m, the average particle diameter of the ZrW 2O8 particles was 4 μm and D5 was 0.1. Mu.m.
The prepared diamond and negative expansion particle reinforced aluminum matrix composite material has poor tissue uniformity, and cracks are generated at a three-phase interface when the rolling reduction is 20%. Since the diamond powder and the negative thermal expansion particles have large difference in particle diameter, the negative thermal expansion particles having smaller size are deposited on the lower portion, and the particles having larger size are deposited on the upper portion, resulting in uneven structure.
Comparative example 3
Unlike example 2, in step S3 of this comparative example, the heat was preserved at a temperature of 670 ℃ for 100min.
When the reduction rate of the prepared diamond and negative expansion particle reinforced aluminum matrix composite material is 20%, cracks are generated between the diamond phase and the aluminum matrix, and the reason is that the generated Al 4C3 phase is too thick, so that the deformation coordination capacity is reduced.
Comparative example 4
Unlike example 1, in step S3 of this comparative example, the temperature was kept at 670 ℃ for 15min.
The prepared diamond and negative expansion particle reinforced aluminum matrix composite material has holes in the structure, and cracks are generated between the diamond phase and the aluminum matrix when the rolling reduction rate of the prepared diamond and negative expansion particle reinforced aluminum matrix composite material is 20%.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A diamond and negative expansion particle reinforced aluminum-based composite material is characterized in that,
The aluminum-based composite material consists of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix, wherein the average grain diameter of the diamond phase is 10-1000 mu m, and the ratio of the average grain diameter of the diamond phase to the average grain diameter of the negative thermal expansion particles is 10-20;
the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than the particle size of the negative thermal expansion particles away from the diamond phase.
2. The diamond and negative expansion particle reinforced aluminum matrix composite material according to claim 1, wherein the volume fraction of the diamond phase is 30-80%, the volume fraction of the negative thermal expansion ceramic phase is 10% -40%, and the volume fraction of the aluminum matrix is at least 20%.
3. The diamond and negative expansion particle reinforced aluminum matrix composite of claim 1, wherein the negative thermal expansion phase is one or more of ZrW2O8、Cu2P2O7、Cu2V2O7、PbTiO3、ZrMo2O8、Mn3Zn1-xSnxN or Mn 3Zn1-xGex N, 0< x <1.
4. The diamond and negative expansion particle reinforced aluminum matrix composite of claim 1, wherein the aluminum matrix is pure aluminum or an aluminum alloy.
5. The diamond and negative expansion particle reinforced aluminum matrix composite of claim 1, wherein the negative thermal expansion particles adjacent to the diamond have a particle size range of no more than 0.5 μm.
6. The method for producing a diamond and negative expansion particle-reinforced aluminum matrix composite according to any one of claims 1 to 5, wherein,
Weighing diamond powder, negative thermal expansion particles and aluminum matrix material according to a proportion;
mixing the diamond powder with negative thermal expansion particles, placing the mixture in a graphite mold, vibrating the mixture, and placing the aluminum matrix material above the graphite mold;
Vacuum heating and melting are carried out on the graphite mold, and pressurizing and heat-preserving treatment is carried out after heat preservation is carried out for preset time;
and (5) cooling after the supercharging heat preservation treatment is finished.
7. The method according to claim 6, wherein,
The average grain diameter of the diamond powder is 10-1000 mu m, and the ratio of the average grain diameter of the diamond phase to the average grain diameter of the negative thermal expansion particles is 10-20.
8. The method according to claim 6, wherein,
The negative thermal expansion particles have a D5 of not more than 0.5 μm.
9. The method according to claim 6, wherein,
The vacuum heating process comprises the steps of keeping the vacuum degree of a smelting furnace at less than or equal to 1Pa, heating at a speed of 20-80 ℃ per minute, and preserving heat at a temperature of Tm-Tm+150 ℃ for 20-70 min, wherein Tm is the melting point of an aluminum substrate.
10. The method according to claim 6, wherein,
The pressurizing and heat-preserving treatment process comprises the steps of pressurizing to 0.5-2.5 mpa by inert gas, and preserving heat and pressure for 10-60 min at Tm-Tm+150 ℃, wherein Tm is the melting point of an aluminum matrix.
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