CN110340368B - Preparation method of high-performance graphite film copper-based composite material - Google Patents
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Abstract
The invention provides a preparation method of a high-performance graphite film copper-based composite material, belongs to the technical field of metal-graphite composite material preparation, and solves the technical problem of poor bonding property between a graphite film and a copper matrix in the graphite film copper-based composite material. The preparation method sequentially comprises the following steps: the preparation method comprises the steps of pretreatment of a graphite film and a copper matrix, preparation of alloy powder, preparation of an alloy powder solution, preparation of a preform by a layer-laying method, and vacuum hot-pressing sintering of the preform to finally prepare the high-performance graphite film copper-based composite material. The invention is convenient to prepare, has strong binding force between the graphite and the copper metal layer, high thermal conductivity and low density, and is a novel thermal management material with a very promising prospect.
Description
Technical Field
The invention belongs to the technical field of metal-graphite composite material preparation, and particularly relates to a preparation method of a high-performance graphite film copper-based composite material.
Background
With the continuous development of miniaturization, integration and high efficiency of electronic equipment, the energy density in the working process is continuously increased, and higher requirements are put forward on the heat conducting performance and the mechanical performance of the heat management material.
The graphite film has an in-plane thermal conductivity of 1200-1800W/mk due to its ultrahigh thermal conductivity and good specific heat capacity, and has been successfully commercialized and applied to heat dissipation of mobile phones and computers. The high-thermal-conductivity graphite film has poor mechanical properties, so that the application range of the graphite film material is greatly limited, the high-thermal-conductivity graphite film and copper metal are made into a composite material which is a promising high-efficiency heat management material, however, the wettability of graphite and copper is poor, and the associativity of the graphite film and the copper metal film is poorer, so that a method for preparing the graphite film copper-based composite material is urgently needed to be solved, and the graphite film can be widely applied to the field of the high-efficiency heat management material.
Disclosure of Invention
The invention provides a preparation method of a high-performance graphite film copper-based composite material, aiming at overcoming the defects in the prior art and solving the technical problem of poor bonding property of a graphite film and a metal film in the graphite film metal composite material.
The design concept of the invention is as follows: on one hand, the copper titanium, the copper chromium alloy and the graphite have lower wetting angle and good combination property; on the other hand, the combination property of the copper titanium and the copper chromium alloy and the copper base material is also better. Therefore, the invention adopts the copper-titanium alloy or the copper-chromium alloy as the high-temperature binder between the graphite film and the copper matrix, and can better solve the problems that the graphite film and the copper matrix are not infiltrated and the binding force is poor.
The invention is realized by the following technical scheme.
A preparation method of a high-performance graphite film copper-based composite material comprises the following steps:
s1, preprocessing: placing the graphite film in an acetone solution to be soaked for 10-30 min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 1-10 min, placing the copper substrate in the alcohol to be ultrasonically cleaned for 5-20 min, finally taking out the ultrasonically cleaned graphite film and the copper substrate to be placed in a drying oven, and drying at 50-80 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the titanium powder or the copper powder and the chromium powder according to the mass ratio of 50: 1-5: 1, and placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 50: 1-10: 1, ball milling time: reversing every 10min for 60 min-1200 min, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1: 1-1: 5, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper base material with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of alloy powder solution on the upper surface of the first layer of copper base material to ensure that the second layer of alloy powder solution is uniformly coated on the surface of the first layer of copper base material;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper substrate are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 2-10 hours at the temperature of 50-80 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the dried preform obtained in the step S4 in a vacuum hot-pressing furnace for vacuum hot-pressing sintering to obtain the high-performance graphite film copper-based composite material.
Furthermore, the graphite film is an artificially synthesized graphite film, the thickness of the graphite film is 15-100 mu m, and the in-plane thermal conductivity of the graphite film is 400-1500W/mk.
Furthermore, the copper base material is copper or its alloy, and the form of the copper base material is foil or plate.
Further, the alloy powder in step S2 is a mixed alloy powder of copper powder and titanium powder, or a mixed alloy powder of copper powder and chromium powder.
Further, the hot pressing temperature in the step S5 is 800-1100 ℃.
Further, the hot-pressing pressure in the step S5 is 0 to 50 MPa.
Further, the hot pressing pressure maintaining time in the step S5 is 0.5-2 h.
Compared with the prior art, the invention has the following beneficial effects:
the graphite film copper-based composite material prepared by the invention has higher thermal conductivity, and the graphite film and the copper base material have better bonding performance, integrates the advantages of copper and graphite materials, and is a competitive novel thermal management material. The preparation process is simple, the shape, size, thickness and thermal conductivity of the prepared composite material can be adjusted, and the composite material can be used under the high-temperature condition and has a wider application range.
Detailed Description
In order to explain the technical aspects, structural features, and technical effects of the present invention in detail, the following detailed description is given with reference to the embodiments. The following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. Example 1
S1, preprocessing: the method comprises the steps of soaking a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for 10min, taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 1min, placing a copper substrate in the alcohol, ultrasonically cleaning the copper substrate for 5min, taking out the graphite film and the copper substrate, placing the graphite film and the copper substrate in an oven, and drying the graphite film and the copper substrate at 50 ℃ for later use.
S2, preparing alloy powder: weighing copper powder and titanium powder according to a mass ratio of 30:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 50:1, ball milling time: and (4) reversing every 10min for 120min to avoid material sticking, and performing ball milling to obtain alloy powder.
S3, preparing an alloy powder solution: and (4) preparing the alloy powder prepared in the step (S2) and alcohol according to the mass ratio of 1:2, and uniformly stirring to obtain an alloy powder solution.
S4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 8 hours at the temperature of 50 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
and S5, placing the dried preform in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 800 ℃, the hot pressing pressure is 10MPa, and the hot pressing pressure maintaining time is 0.5h, so as to prepare the high-performance graphite film copper-based composite material, the volume fraction of the graphite film of the prepared composite material is 64%, the interface bonding property is good, and the thermal conductivity is as high as 732W/mk.
Example 2
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 15min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 5min, placing a copper substrate in alcohol for ultrasonically cleaning for 10min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 60 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the titanium powder according to the mass ratio of 20:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 40:1, ball milling time: 480min, reversing every 10min to avoid material sticking, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:3, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 5 hours at the temperature of 60 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 900 ℃, the hot pressing pressure is 20MPa, and the hot pressing pressure maintaining time is 1h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of a graphite film of the prepared composite material is 63.6%, the interface bonding performance is good, and the thermal conductivity is as high as 764W/mk.
Example 3
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 20min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 10min, placing a copper substrate in alcohol for ultrasonically cleaning for 15min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 70 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the titanium powder according to the mass ratio of 9:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 30:1, ball milling time: 960min, reversing every 10min to avoid sticking, and leaving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:4, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 2 hours at the temperature of 70 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
and S5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 1050 ℃, the hot pressing pressure is 30MPa, and the hot pressing pressure maintaining time is 1.5h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of the graphite film of the prepared composite material is 63.2%, the interface bonding performance is good, and the thermal conductivity is as high as 793W/mk.
Example 4
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 10min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 1min, placing a copper substrate in alcohol for ultrasonically cleaning for 5min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 50 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the chromium powder according to the mass ratio of 50:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 50:1, ball milling time: reversing every 10min for 120min to avoid material sticking, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:2, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 8 hours at the temperature of 50 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 800 ℃, the hot pressing pressure is 10MPa, and the hot pressing pressure maintaining time is 0.5h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of the graphite film of the prepared composite material is 61.4%, the interface bonding performance is good, and the thermal conductivity is as high as 783W/mk.
Example 5
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 15min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 5min, placing a copper substrate in alcohol for ultrasonically cleaning for 10min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 60 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the chromium powder according to the mass ratio of 25:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 40:1, ball milling time: 480min, reversing every 10min to avoid material sticking, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:3, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 5 hours at the temperature of 60 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 900 ℃, the hot pressing pressure is 20MPa, and the hot pressing pressure maintaining time is 1h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of a graphite film of the prepared composite material is 62.1%, the interface bonding performance is good, and the thermal conductivity is up to 811W/mk.
Example 6
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 20min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 10min, placing a copper substrate in alcohol for ultrasonically cleaning for 15min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 70 ℃ for later use;
s2, preparing alloy powder: weighing the raw materials of copper powder and chromium powder according to the mass ratio of 13:1, and placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 30:1, ball milling time: 960min, reversing every 10min to avoid sticking, and leaving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:4, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 2 hours at the temperature of 70 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 1050 ℃, the hot pressing pressure is 30MPa, and the hot pressing pressure maintaining time is 1.5h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of the graphite film of the prepared composite material is 62.5%, the interface bonding performance is good, and the thermal conductivity is as high as 786W/mk.
Example 7
This example 7 is a comparative example to example 3.
S1, preprocessing: placing a graphite film (with the thermal conductivity of 600W/mk) with the thickness of about 100 mu m in an acetone solution for soaking for 15min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 10min, placing a copper substrate in alcohol for ultrasonically cleaning for 15min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 70 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the titanium powder according to the mass ratio of 9:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 30:1, ball milling time: 960min, reversing every 10min to avoid sticking, and leaving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:4, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper plate (the thickness is 100 mu m) with the same area as the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper plate to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper plate;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper plate are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 2 hours at the temperature of 70 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the prefabricated body dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 1050 ℃, the hot pressing pressure is 30MPa, and the hot pressing pressure maintaining time is 1.5h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of the graphite film of the prepared composite material is 49%, the interface bonding performance is good, and the thermal conductivity is up to 515W/mk.
Example 8
This example 8 is a comparative example to example 5.
S1, preprocessing: placing a graphite film (the thermal conductivity is 1200W/mk) with the thickness of about 30 mu m in an acetone solution for soaking for 15min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 5min, placing a copper substrate in alcohol for ultrasonically cleaning for 10min, finally taking out the ultrasonically cleaned graphite film and the copper substrate, placing the ultrasonically cleaned graphite film and the copper substrate in an oven, and drying at 60 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the chromium powder according to the mass ratio of 25:1, placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 40:1, ball milling time: 480min, reversing every 10min to avoid material sticking, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1:3, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper foil (with the thickness of 10 mu m) with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of gold powder solution on the upper surface of the first layer of copper foil to ensure that the second layer of gold powder solution is uniformly coated on the surface of the first layer of copper foil;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper foil are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 5 hours at the temperature of 60 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the preform dried in the step S4 in a vacuum hot pressing furnace for vacuum hot pressing sintering, wherein the hot pressing temperature is 900 ℃, the hot pressing pressure is 20MPa, and the hot pressing pressure maintaining time is 1h, so that the high-performance graphite film copper-based composite material is prepared, the volume fraction of a graphite film of the prepared composite material is 75%, the interface bonding performance is good, and the thermal conductivity is up to 856W/mk.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (6)
1. The preparation method of the high-performance graphite film copper-based composite material is characterized by comprising the following steps of:
s1, preprocessing: placing the graphite film in an acetone solution to be soaked for 10-30 min, then taking out the graphite film, ultrasonically cleaning the graphite film in alcohol for 1-10 min, placing the copper substrate in the alcohol to be ultrasonically cleaned for 5-20 min, finally taking out the ultrasonically cleaned graphite film and the copper substrate to be placed in a drying oven, and drying at 50-80 ℃ for later use;
s2, preparing alloy powder: weighing the copper powder and the titanium powder or the copper powder and the chromium powder according to the mass ratio of 50: 1-5: 1, and placing the raw material powder in a ball mill for ball milling, wherein the ball milling conditions are as follows: argon protection, ball material ratio: 50: 1-10: 1, ball milling time: reversing every 10min for 60 min-1200 min, and reserving the alloy powder subjected to ball milling for later use;
s3, preparing an alloy powder solution: weighing the alloy powder prepared in the step S2 and alcohol according to the mass ratio of 1: 1-1: 5, and uniformly stirring the alloy powder and the alcohol to prepare an alloy powder solution for later use;
s4, preparing a prefabricated body by a layer-spreading method:
i, brushing the first layer of alloy powder solution prepared in the step S3 on the surface of the first layer of graphite film, then placing a first layer of copper base material with the area equal to that of the first layer of graphite film above the first layer of alloy powder solution, and then brushing a second layer of alloy powder solution on the upper surface of the first layer of copper base material to ensure that the second layer of alloy powder solution is uniformly coated on the surface of the first layer of copper base material;
II, placing a second layer of graphite film on the surface of the second layer of alloy powder solution, and repeating the operation in the step I until the graphite film, the alloy powder solution and the copper substrate are superposed to the target thickness;
III, placing the prefabricated body prepared in the step II in an oven to be dried for 2-10 hours at the temperature of 50-80 ℃ to ensure that the alcohol is completely volatilized to prepare the prefabricated body;
s5, placing the dried preform obtained in the step S4 in a vacuum hot-pressing furnace for vacuum hot-pressing sintering to obtain the high-performance graphite film copper-based composite material.
2. The preparation method of the high-performance graphite film copper-based composite material according to claim 1, characterized in that: the graphite film is an artificially synthesized graphite film, the thickness of the graphite film is 15-100 mu m, and the in-plane thermal conductivity of the graphite film is 400-1500W/mK.
3. The preparation method of the high-performance graphite film copper-based composite material according to claim 1, characterized in that: the copper base material is made of copper and an alloy thereof, and the copper base material is in a form of foil or plate.
4. The preparation method of the high-performance graphite film copper-based composite material according to claim 1, characterized in that: and the hot pressing temperature in the step S5 is 800-1100 ℃.
5. The preparation method of the high-performance graphite film copper-based composite material according to claim 1, characterized in that: the hot-pressing pressure in the step S5 is 0-50 MPa.
6. The preparation method of the high-performance graphite film copper-based composite material according to claim 1, characterized in that: and the hot-pressing pressure maintaining time in the step S5 is 0.5-2 h.
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