CN111442674B - Method for processing heat dissipation plate - Google Patents
Method for processing heat dissipation plate Download PDFInfo
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- CN111442674B CN111442674B CN202010186086.7A CN202010186086A CN111442674B CN 111442674 B CN111442674 B CN 111442674B CN 202010186086 A CN202010186086 A CN 202010186086A CN 111442674 B CN111442674 B CN 111442674B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 title claims abstract description 26
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- 238000005187 foaming Methods 0.000 claims abstract description 113
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 13
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910000077 silane Inorganic materials 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
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- 229910021641 deionized water Inorganic materials 0.000 claims description 6
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- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
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- ILEDWLMCKZNDJK-UHFFFAOYSA-N esculetin Chemical compound C1=CC(=O)OC2=C1C=C(O)C(O)=C2 ILEDWLMCKZNDJK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention discloses a method for processing a heat dissipation plate, which comprises the following steps: filling foaming slurry in a flow channel of the heat dissipation plate; standing the heat dissipation plate for a preset time to enable the foaming slurry to be attached to the inner wall of the flow channel; filling gas into the flow channel to discharge the foaming slurry which is not attached in the flow channel out of the flow channel; and carrying out high-temperature treatment on the foaming slurry attached in the flow channel so as to sinter the attached foaming slurry to form a capillary layer. The foaming slurry is prevented from blocking a heat dissipation plate flow channel by injecting gas to extrude the foaming slurry, and then the foaming slurry adhered to the inner wall of the flow channel is sintered at high temperature to obtain a capillary layer, so that the capillary layer is uniformly distributed on the inner wall of the whole flow channel, and the temperature equalizing efficiency of the heat dissipation plate is improved. The method has the advantages that the foaming slurry can be repeatedly filled into the flow channel and stands, the foaming slurry which is not adhered is extruded through gas after standing every time, the thickness of the capillary layer prepared by sintering the foaming slurry is adjusted, the operation is simple, the processing is convenient, and the problem of processing the capillary layer in the micro flow channel is solved.
Description
Technical Field
The invention relates to the technical field of heat dissipation of electronic devices, in particular to a method for processing a heat dissipation plate.
Background
The working principle of the heat dissipation plate is that heat is transferred by utilizing the evaporation and condensation of a liquid working medium, namely gas-liquid phase change, and the specific process is that one end of a heat transfer device is heated to evaporate the liquid working medium, steam flows to the other end under a small pressure difference to release heat and condense the heat into liquid, the liquid flows back to an evaporation section along a pipe wall, the process is continuously circulated, and therefore the heat is transferred from one end of the phase change type heat transfer device to the other end.
The liquid working medium accommodated in the traditional heat dissipation plate completely flows back by means of gravity, the backflow driving force is insufficient, the backflow speed of the liquid working medium is low, the gas-liquid phase change circulation frequency is low, and even the liquid working medium is completely vaporized, namely the dry burning condition occurs.
At present, a capillary layer is additionally arranged in a cavity inside a heat dissipation plate, so that the mass transfer power of a liquid working medium can be effectively improved, and the temperature equalization performance of the heat dissipation plate is ensured. However, because the heat transfer cavity of the heat dissipation plate is narrow in structure, the width of the cavity is generally 5-10 mm, and the height of the cavity is less than 3mm, so that the capillary layer is difficult to be uniformly distributed on the inner wall of the cavity in a narrow space, and even the situation that the capillary layer is gathered to block the inner cavity can occur, the flow of liquid working media is influenced, and the heat transfer efficiency of the heat dissipation plate is further influenced.
Disclosure of Invention
The invention provides a method for processing a heat dissipation plate, and aims to optimize a process for processing a capillary layer of a cavity in the heat dissipation plate, ensure that the capillary layer is uniformly distributed on the wall surface of the cavity in the heat dissipation plate, and improve the effective mass transfer area of the capillary layer.
In order to achieve the above object, the present invention provides a method for processing a heat dissipation plate, comprising the steps of:
filling foaming slurry into the flow channel of the heat dissipation plate;
standing the heat dissipation plate for a preset time to enable the foaming slurry to be attached to the inner wall of the flow channel;
filling gas into the flow channel to discharge the foaming slurry which is not attached in the flow channel out of the flow channel;
and carrying out high-temperature treatment on the foaming slurry attached in the flow channel so as to sinter the attached foaming slurry to form a capillary layer.
The effects in the above embodiment are: after the foaming slurry is filled in the whole flow passage, the foaming slurry which is not adhered is extruded by gas, so that the foaming slurry is prevented from blocking the flow passage of the heat dissipation plate. The adhered foaming slurry can be distributed on the inner wall of the whole flow passage, and then the foaming slurry adhered on the inner wall of the flow passage is sintered at high temperature to obtain a capillary layer, so that the capillary layer can be conveniently processed in the flow passage with a tiny structure.
Optionally, the viscosity of the foaming slurry is 0.2-100 Pa.s.
The effects in the above embodiment are: the foaming slurry can adhere to the wall surface of the flow passage within the viscosity range of 0.2-100 Pa.s.
Optionally, the foaming slurry is prepared by uniformly mixing a polymer binder, a composite nano filler, a silane coupling agent and a foaming agent.
Optionally, the polymeric binder is a PVA binder; the composite nano filler is one or a combination of more of expanded graphite, spherical graphite, crystalline flake graphite, carbon nano fiber, carbon nano tube, chopped carbon fiber, silicon dioxide and calcium carbonate; the foaming agent is an inorganic foaming agent.
Optionally, the preparation method of the foaming slurry comprises the following steps:
the PVA binder is added into deionized water or distilled water, heated while being stirred, and cooled to room temperature after a stable and transparent solution is formed.
And adding the composite nano filler and the silane coupling agent solution into a stirrer, and uniformly mixing to obtain the silane modified composite nano filler.
And finally, adding the silane modified composite nano filler and the foaming agent into the PVA adhesive, continuously stirring, uniformly mixing, and adding distilled water or deionized water to adjust the viscosity to obtain the foaming slurry.
The effects in the above embodiment are: the foaming slurry is sintered into a capillary layer, and then the main component of the foaming slurry is a carbon-based composite material, so that the specific surface area is large, the capillary layer is rich, the physical and chemical properties are stable, the foaming slurry can be compatible with various liquid working media, the structural strength is high, and the long-term stable operation of the heat dissipation plate can be ensured.
Optionally, the preset time for the heat dissipation plate to stand is 5-30 min.
The effects in the above embodiment are: the foaming slurry can be fully adhered to the wall surface of the runner within the preset standing time range of 5-30 min.
Optionally, the gas filled in the flow channel is nitrogen.
The effects in the above embodiment are: the nitrogen has stable property, can avoid the reaction with the materials in the foaming slurry, and simultaneously avoids bringing other impurities to influence the stability of the foaming slurry.
Optionally, the foaming slurry is subjected to high-temperature treatment conditions that: sintering at 300 ℃ for 3-5 h.
The effects in the above embodiment are: after sintering at 300 ℃ for 3-5 h, all volatile substances in the foaming slurry are released, and a porous capillary layer is left. The whole sintering process is operated at constant temperature, the temperature rising and falling stages are not needed, and the operation is simple.
Optionally, before the high-temperature treatment of the foaming slurry, the foaming slurry may be repeatedly filled into the flow channel and left standing, after each standing, gas is filled into the flow channel, the foaming slurry not attached to the flow channel is discharged, and the thickness of the foaming slurry attached to the wall surface of the flow channel is adjusted.
The effects in the above embodiment are: because the sizes of the flow channels of different heat dissipation plates are different, the thicknesses of the capillary layers required to be prepared in the flow channels with different sizes are also different, and the flow channels are filled with foaming slurry repeatedly to adjust the foaming slurry attached to the wall surfaces of the flow channels to the optimum thickness, so that the capillary layers finally sintered in the flow channels have the optimum mass transfer performance.
Optionally, the heat dissipation plate is a single-face-blown aluminum plate or a double-face-blown aluminum plate.
The effects in the above embodiment are: the aluminum plate has good heat dissipation performance, is easy to process, and saves cost compared with a copper heat conducting plate.
According to the processing method of the heat dissipation plate, provided by the invention, the foaming slurry with viscosity is filled in the flow channel of the heat dissipation plate, gas is injected into the flow channel to extrude the foaming slurry which is not adhered, so that the foaming slurry is prevented from blocking the flow channel of the heat dissipation plate, and then the foaming slurry adhered to the inner wall of the flow channel is sintered at high temperature to obtain the capillary layer, so that the capillary layer is uniformly distributed on the inner wall of the whole flow channel, the temperature equalization efficiency of the heat dissipation plate is improved, the operation is simple, the processing is convenient, and the problem of processing the capillary layer in a tiny flow channel is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for processing a heat dissipation plate according to the present application;
FIG. 2 is a front view of a heat spreader plate according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of a single-faced, blown aluminum panel in one embodiment of the present application;
FIG. 4 is a cross-sectional view of a double-faced blown aluminum panel in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The heat dissipation plate 1 is generally attached to a heating assembly, a flow channel 101 for packaging a liquid working medium is arranged on the heat dissipation plate 1, and the liquid working medium generates gas-liquid state change and flows in the flow channel 101 to carry away heat around the heating assembly. In order to improve the heat dissipation performance of the heat dissipation plate 1, the capillary layer 2 can be arranged in the flow channel 101 with two open ends before the liquid working medium is packaged to improve the mass transfer power of the liquid working medium. And the capillary layer 2 is processed in the tiny flow channel 101, the situation that the structure of the capillary layer 2 is unstable and is broken under the action of external force, the capillary layer 2 is unevenly distributed, even is gathered to block the flow channel, and the like is easy to happen.
In order to solve the above technical problem, the method for processing a heat dissipation plate according to the present invention, as shown in fig. 1, specifically includes the following steps:
s11, filling the flow path 101 of the heat sink 1 with the foaming slurry.
Distribution of 1 runner 101 of heating panel is mainly set up according to 1 structure demand of heating panel, but the opening homonymy at runner 101 both ends sets up also the different side setting to convenient operation is suitable, as shown in fig. 2, in this embodiment, heating panel 1 sets up to planar structure, and the opening different side setting at runner 101 both ends. When the foaming slurry is poured, the heat dissipation plate 1 is horizontally placed, so that the openings at the two ends of the runner 101 are positioned at the same horizontal plane, the pre-configured foaming slurry is poured from the liquid inlet 102 of the runner 101 through the pouring equipment, and the feeding is stopped until the foaming slurry overflows from the liquid outlet 103 at the other end of the runner 101, wherein the state indicates that the runner 101 is filled with the foaming slurry.
S12, standing the heat dissipation plate 1 for a predetermined time to allow the foaming slurry to adhere to the inner wall of the flow channel 101.
The foaming slurry is a liquid with viscosity, and can adhere to the inner wall of the flow channel 101, but the foaming slurry is easy to flow under the action of external forces such as shaking, blowing and sucking, and the like, so that the thickness of the foaming slurry adhering to the wall surface of the flow channel 101 is limited, the adhesion of the foaming slurry on the wall surface of the flow channel 101 is reinforced by standing for a period of time, and the thickness of the foaming slurry adhering to the wall surface of the flow channel 101 is adjusted. During the standing period, in order to further increase the adhesiveness of the foaming slurry, the heat dissipation plate 1 may be slightly heated to increase the viscosity of the foaming slurry close to the wall surface of the flow passage 101, thereby shortening the standing time and improving the processing efficiency. During the standing period, it is necessary to ensure that the foaming slurry in the flow channel 101 is always in a full state, i.e. the wall surface of the flow channel 101 is completely covered by the foaming slurry.
S13, filling gas into the flow channel 101 to discharge the foaming slurry not adhered to the flow channel 101 out of the flow channel 101.
After the foaming slurry is statically adhered to the wall surface of the flow channel 101, the foaming slurry which is not adhered in the flow channel 101 needs to be extruded out to dredge the flow channel 101. In the prior art, the foaming slurry is poured into the runner 101, and then the foaming slurry is dispersed in a vibration mode, so that on one hand, the foaming slurry is only distributed on one side of the runner 101, and the foaming slurry is easy to gather and difficult to disperse uniformly, which affects the smoothness of the runner 101, and on the other hand, partial raw materials in the foaming slurry are possibly deposited due to factors such as gravity, and the dispersion state of the materials in the foaming slurry is changed. In this embodiment, the problem of uneven dispersion of the foaming slurry can be solved by adopting a gas extrusion mode, the surface of the foaming slurry adhered to the wall surface of the flow channel 101 is smooth, the smoothness of the flow channel 101 is ensured, and the stability of the foaming slurry is not affected by mild operation.
S14, performing a high temperature treatment on the foaming slurry attached in the flow channel 101, so that the attached foaming slurry is sintered to form the capillary layer 2.
After high-temperature treatment, all volatile substances in the foaming slurry are released and cured to leave a porous structure, namely the capillary layer 2. In consideration of the convenience of operation, in this embodiment, the entire heat dissipation plate 1 is placed in a high-temperature vacuum oven, and after the high-temperature vacuum oven is adjusted to be in a vacuum state and is subjected to high-temperature treatment, the heat dissipation plate 1 is taken out and cooled, so that the capillary layer 2 is obtained.
The heat dissipation plate 1 and the foaming paste may be prepared in advance before the step S11 is performed, and the preparation sequence of the foaming paste and the heat dissipation plate 1 may be performed sequentially or simultaneously according to the convenience of operation. In the present embodiment, the heat dissipating plate 1 is prepared first, and then the foaming slurry is prepared.
When the heat dissipation plate 1 is manufactured, two substrates are taken, the piping diagrams are printed on the two substrates respectively, the substrates are fastened after being dried, and are sent into a tunnel furnace for hot rolling, and are cooled and then rolled, so that the rolling surfaces 104 of the two substrates and the heat source arrangement surface 105 are tightly connected. Then leveling the two rolled basic plates, and filling high-pressure gas into the two base plates to enable the unconnected areas on the two base plates to be expanded to form a flow channel 101 for containing liquid working media.
As shown in fig. 3, a first commercially pure aluminum plate 301 and an aluminum alloy plate 302 can be selected as two substrates for manufacturing the heat dissipation plate 1, and when high-pressure gas is filled into the first commercially pure aluminum plate 301 and the aluminum alloy plate 302, only the first commercially pure aluminum plate 301 is expanded to manufacture a single-side blown aluminum plate.
As shown in fig. 4, two second commercially pure aluminum plates 401 may be used as the two substrates, and when high-pressure gas is filled into the two second commercially pure aluminum plates 401, the two second commercially pure aluminum plates 401 expand simultaneously, so as to obtain a double-faced blown aluminum plate. The aluminum plate has good heat dissipation performance, is easy to process, and saves cost compared with a copper heat conducting plate.
After the runner 101 on the heat dissipation plate 1 is blown and formed, the foaming slurry is prepared. Tests prove that the prepared foaming slurry is suitable for adhering to the wall surface of the flow channel 101 when the viscosity of the prepared foaming slurry is 0.2-100 Pa.s. The foaming slurry has too low viscosity to be adhered to the wall surface of the flow passage, and the foaming slurry is not extruded due to too high viscosity, and the adhesion thickness of the foaming slurry is not convenient to adjust.
Specifically, in the embodiment of the application, the foaming slurry is prepared by uniformly mixing a high-molecular binder, a composite nano filler, a silane coupling agent and a foaming agent.
The polymer binder is PVA binder; the composite nano filler is one or a combination of more of expanded graphite, spherical graphite, crystalline flake graphite, carbon nano fiber, carbon nano tube, chopped carbon fiber, silicon dioxide and calcium carbonate; the foaming agent is an inorganic foaming agent.
The preparation method of the foaming slurry comprises the following steps:
the PVA binder is added into deionized water or distilled water, heated while being stirred, and cooled to room temperature after a stable and transparent solution is formed.
And adding the composite nano filler and the silane coupling agent solution into a stirrer, and uniformly mixing to obtain the silane modified composite nano filler.
And finally, adding the silane modified composite nano filler and the foaming agent into the PVA adhesive, continuously stirring, uniformly mixing, and adding distilled water or deionized water to adjust the viscosity to obtain the foaming slurry. Under the coating effect of the PVA binder, the silane modified composite nano filler and the foaming agent are uniformly dispersed in the whole foaming slurry, aggregation does not occur, deposition cannot easily occur under the external force action of violent vibration and the like, and thus, the capillary layer structure finally prepared by sintering is uniform and stable.
The sodium bicarbonate added into the foaming slurry can be decomposed to release carbon dioxide under low-temperature firing, a porous structure is formed together with water molecules by evaporation, and meanwhile, the composite nano filler with large specific surface area added into the slurry can further enrich the capillary layer 2 and improve the mass transfer power of the capillary layer 2 to the liquid working medium. The capillary layer 2 prepared by sintering the foaming slurry in the embodiment mainly comprises a carbon-based composite material, has a large specific surface area, is rich in the capillary layer 2, has stable physical and chemical properties and high structural strength, can ensure long-term stable operation of the heat dissipation plate 1, and can be compatible with various liquid working media, wherein the liquid working media can be but are not limited to water, liquid nitrogen, ammonia, isobutane, acetone, methanol, ethanol, HFC refrigerants and the like.
The preset time for standing is set to be 5-30min in consideration of factors such as viscosity of the foaming slurry, thickness of the foaming slurry adhered to the wall surface of the flow passage 101, processing time consumption and the like, and the foaming slurry can be ensured to be adhered to the wall surface of the flow passage 101 of the heat dissipation plate 1 within the time range.
In step S13, gas is filled into the flow channel 101, the injected gas is required not to react with the raw material in the foaming slurry, and other impurities that can dissolve in the foaming slurry are not brought in, and in consideration of the convenience and cost of obtaining the gas, in this embodiment, nitrogen is selected to fill the flow channel 101, so that an ideal blowing effect can be obtained.
In order to further improve the mass transfer power of the capillary layer 2 finally fired on the inner wall of the flow channel 101, before the foam slurry is subjected to high-temperature treatment, the foam slurry can be repeatedly filled into the flow channel 101 and kept stand, after each standing, gas is filled into the flow channel 101, the foam slurry not attached to the flow channel 101 is discharged, and the thickness of the foam slurry attached to the wall surface of the flow channel 101 is adjusted, so that the thickness of the capillary layer 2 formed after the inner wall of the flow channel 101 is sintered is increased, and the purpose of improving the mass transfer power of the capillary layer 2 is achieved.
In step S14, according to the material and the adhesion thickness of the foam slurry in this embodiment, it is determined that the foam slurry is sintered at 300 ℃ for 3h to 5h, and a step-wise temperature increase and decrease operation is not required, so that the process is simple. Under such conditions, the foamed slurry adhering to the wall surface of the flow channel 101 can be sufficiently sintered to form the capillary layer 2.
Specifically, the following description will be given with reference to the processing methods of the single-side blown aluminum plate and the double-side blown aluminum plate of different specifications for the inner capillary layer 2. The larger the size of the flow channel 101 of the heat dissipation plate 1 is, the thicker the capillary layer 2 required in the flow channel 101 needs to be, so that the mass transfer power of the capillary layer 2 in the flow channels 101 with different sizes can be met.
In this embodiment, taking the processing of the capillary structure in the single-side blown aluminum plate as an example, the specific process is as follows:
taking a first industrial pure aluminum plate 301 and an aluminum alloy plate 302, rolling, leveling and blowing to obtain a single-face blown aluminum plate, wherein the height of an inner cavity of a flow channel 101 of the single-face blown aluminum plate is 3mm, and the width of the inner cavity is 5 mm.
Weighing the raw materials of the foaming slurry according to the weight fraction ratio, uniformly mixing and adjusting the viscosity to be 50Pa.s, preferably, the formula of the foaming slurry comprises the following components: 50 parts of PVA binder, 60 parts of composite nano-filler, 3 parts of silane coupling agent solution and 6 parts of foaming agent, wherein the composite nano-filler is expanded graphite, chopped carbon fiber and graphite flake according to the weight ratio of 1: 1: 1 proportion, and the foaming agent is sodium bicarbonate.
And repeatedly filling foaming slurry into the single-side blowing aluminum plate runner 101 for three times and standing, wherein the preset time of standing is 5min each time, and filling nitrogen to extrude the foaming slurry which is not adhered to the inner wall of the runner 101 after standing each time.
And (3) conveying the single-sided blown aluminum plate into a high-temperature vacuum oven for high-temperature treatment at 300 ℃ for 3 hours, and sintering the foaming slurry adhered to the wall surface of the runner 101 to form a capillary layer 2.
And (2) closing a liquid outlet 103 of a flow passage 101 of the heat dissipation plate 1, placing the heat dissipation plate in vacuum filling equipment, injecting a liquid working medium from a liquid inlet 102 of the flow passage 101 of the heat dissipation plate 1, wherein the liquid working medium is acetone, and finally closing the liquid inlet 102 to obtain the single-side blown aluminum plate with the capillary layer 2 inside.
In this embodiment, taking the processing of the capillary structure in the double-faced blown aluminum plate as an example, the specific process is as follows:
and rolling, leveling and blowing two second industrial pure aluminum plates 401 to obtain the double-faced blown aluminum plate, wherein the height of the inner cavity of the double-faced blown aluminum plate runner 101 is 4mm, and the width of the inner cavity is 7 mm.
Weighing the raw materials of the foaming slurry according to the weight fraction ratio, and uniformly mixing to adjust the viscosity to be 60 Pa.s. Preferably, the foaming slurry formulation consists of: 60 parts of PVA binder, 80 parts of composite nano-filler, 2 parts of silane coupling agent solution and 5 parts of foaming agent, wherein the composite nano-filler is expanded graphite, chopped carbon fiber, spherical graphite and graphite flake according to the weight ratio of 1: 1: 1: 1 proportion, and the foaming agent is sodium bicarbonate.
And repeatedly filling foaming slurry into the double-faced blowing aluminum plate runner 101 for five times and standing, wherein the preset time of standing is 5min each time, and filling nitrogen to extrude the foaming slurry which is not adhered to the inner wall of the runner 101 after standing each time.
And (3) conveying the single-sided blown aluminum plate into a high-temperature vacuum oven for high-temperature treatment at 300 ℃ for 5 hours, taking out and cooling to obtain a capillary layer 2.
And (3) closing a liquid outlet 103 of the flow channel 101, placing the heat dissipation plate 1 in vacuum filling equipment, injecting a liquid working medium from a liquid inlet 102 of the flow channel 101, wherein the liquid working medium is acetone, and finally closing the liquid inlet 102 to obtain the double-faced blown aluminum plate with the capillary layer 2 inside. When the heat dissipation plate 1 is applied to a heating component, the capillary layer has better mass transfer power, and an ideal heat dissipation effect can be obtained.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for processing a heat dissipation plate is characterized by comprising the following steps:
filling foaming slurry into the flow channel of the heat dissipation plate;
standing the heat dissipation plate for a preset time to enable the foaming slurry to be attached to the inner wall of the flow channel;
Filling gas into the flow channel to discharge the foaming slurry which is not attached in the flow channel out of the flow channel;
and carrying out high-temperature treatment on the foaming slurry attached in the flow channel so as to sinter the attached foaming slurry to form a capillary layer.
2. The method for processing a heat dissipating plate according to claim 1, wherein the viscosity of the foaming slurry is 0.2 to 100 pa.s.
3. The method for processing a heat dissipating plate as claimed in claim 1, wherein the foaming paste is prepared by uniformly mixing a polymer binder, a composite nanofiller, a silane coupling agent and a foaming agent.
4. The method for processing a heat dissipating plate according to claim 3, wherein the polymer binder is a PVA binder; the composite nano filler is one or a combination of more of expanded graphite, spherical graphite, crystalline flake graphite, carbon nano fiber, carbon nano tube, chopped carbon fiber, silicon dioxide and calcium carbonate; the foaming agent is an inorganic foaming agent.
5. The method for processing a heat radiating plate according to claim 4, wherein the foaming paste is prepared by:
adding the PVA binder into deionized water or distilled water, stirring and heating at the same time, and cooling to room temperature after a stable and transparent solution is formed;
Adding the composite nano filler and the silane coupling agent solution into a stirrer, and uniformly mixing to obtain a silane modified composite nano filler;
adding the silane modified composite nano filler and the foaming agent into the PVA binder, continuously stirring, uniformly mixing, and adding distilled water or deionized water to adjust the viscosity, thereby preparing the foaming slurry.
6. The method for processing a heat dissipating plate as claimed in claim 1, wherein the predetermined time for which the heat dissipating plate is left standing is 5 to 30 min.
7. The method for processing a heat dissipating plate as claimed in claim 1, wherein the gas filled in the flow passage is nitrogen.
8. The method for processing a heat radiating plate according to claim 1, wherein the foaming slurry is subjected to high temperature treatment conditions of: sintering at 300 ℃ for 3-5 h.
9. The method for processing a heat dissipating plate according to claim 1, wherein the foamed slurry is repeatedly filled into the flow path and left standing before the foamed slurry is subjected to the high temperature treatment, and after each standing, the gas is charged into the flow path to discharge the foamed slurry not adhering to the flow path, thereby adjusting the thickness of the foamed slurry adhering to the wall surface of the flow path.
10. The method for manufacturing a heat radiating plate according to claim 1, wherein the heat radiating plate is a single-side-blown aluminum plate or a double-side-blown aluminum plate.
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