Preparation method of ultrahigh thermal conductivity diamond / graphene reinforced aluminum matrix composite

Abstract

A method for preparing an ultra-high thermal conductivity diamond / graphene-reinforced aluminum matrix composite material is disclosed, which relates to a method for preparing aluminum matrix composite materials. This method addresses the problem of poor thermal conductivity in existing aluminum matrix composites reinforced with graphene and nanodiamonds, particularly in the direction of graphene normal or the plane containing diamond particles. The method involves weighing nanodiamond powder and graphene, mixing the powders, cold pressing to obtain a diamond / graphene preform, subjecting it to a heating reaction to obtain a preform with a carbon skeleton, and then pressure impregnating it. In this invention, the combination of diamond and graphene generates a carbon skeleton, which strengthens the three-dimensional structure connected between graphene sheets by nanodiamond particles, facilitating heat transfer. Furthermore, the heat can be transferred upwards and downwards along the graphene normal direction through the nanodiamond particles at the carbon atoms of the graphene to adjacent graphene sheets, thereby improving the thermal conductivity of the composite material. The process is simple and can shorten the preparation cycle.

Description

Technical Field

[0001] This invention relates to a method for preparing an aluminum-based composite material. Background Technology

[0002] As technology continues to advance, fields such as semiconductors and aerospace have placed new demands on high thermal conductivity materials. Metal matrix composites are among these high thermal conductivity materials, allowing for the design of different compositional combinations and the controllability of their coefficient of thermal expansion. Compared to other high thermal conductivity metals such as gold and silver, aluminum possesses both high thermal conductivity and low density. Therefore, aluminum-based composites are one of the commonly used high thermal conductivity metal matrix composites. Graphene, a novel two-dimensional carbon nanomaterial, possesses high thermal conductivity, large specific surface area, and excellent overall performance, making it an ideal reinforcement for preparing high thermal conductivity aluminum-based composites. Graphene is a single-layer sheet-like nanomaterial, and heat conduction within its sheets is primarily achieved through the diffusion of phonons across the planar network structure of carbon atoms, thus resulting in very high thermal conductivity within the graphene sheets. When graphene sheets are stacked, the spacing between them is several times greater than the distance between carbon atoms within the layer. They interact only through weak van der Waals forces, resulting in high thermal resistance and very low thermal conductivity in the direction normal to the graphene sheets. This thermal conductivity is significantly lower than their in-plane thermal conductivity, even lower than that of metallic materials. Nanodiamond, on the other hand, is a zero-dimensional material with a stable crystal structure, high thermal conductivity, and a low coefficient of thermal expansion. On the surface of actual nanodiamond particles, there are free functional groups. These groups either couple with adjacent free groups or form a metastable thin surface layer with existing gas atoms. This leads to a lower thermal conductivity between nanodiamond particles compared to the internal thermal conductivity of the diamond particle itself.

[0003] In summary, aluminum-based composites with graphene as the sole reinforcement exhibit low thermal conductivity in the graphene normal direction, while aluminum-based composites with nanodiamond as the sole reinforcement have low thermal conductivity in the plane where the diamond particles are located. Therefore, there is a need to improve the thermal conductivity of graphene-aluminum composites by constructing a three-dimensional graphene / diamond / aluminum composite material that connects two-dimensional graphene with zero-dimensional nanodiamond to form a three-dimensional thermal conductivity model. Summary of the Invention

[0004] To address the problem of poor thermal conductivity in existing aluminum-based composite materials reinforced with graphene and nanodiamonds in the direction of graphene normal or the plane containing diamond particles, this invention proposes a method for preparing ultra-high thermal conductivity diamond / graphene reinforced aluminum-based composite materials.

[0005] The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material of the present invention is carried out according to the following steps:

[0006] I. Weighing materials:

[0007] Weigh out a certain mass of nanodiamond powder and graphene;

[0008] The mass ratio of the nanodiamond powder to graphene is (98~99):(1~2).

[0009] II. Mixed Powder

[0010] Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder.

[0011] III. Precast Molding

[0012] The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform.

[0013] The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 5~15MPa, and the pressure holding time is 5~10min;

[0014] IV. Formation of the carbon skeleton

[0015] The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton.

[0016] The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is heated to 1200~1500℃ at 5~10℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 5~8 kPa and the gas flow rate is 0.04~0.06L / min.

[0017] The carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1;

[0018] V. Room temperature self-venting pressure impregnation

[0019] A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material.

[0020] The pressure for pressure impregnation is 10~50MPa.

[0021] Principles and beneficial effects of this invention:

[0022] 1. In this invention, graphene and nanodiamond are first dispersed and mixed using a liquid-phase method. Due to the compatibility between the surfaces of nanodiamond and graphene, the free groups on the graphene surface interact with the groups on the surface of the nanodiamond particles, causing the nanodiamond particles to be adsorbed onto the carbon atoms of the graphene planar network. The graphene sheets are connected by nanodiamond particles to form a three-dimensional structure. In heat transfer, heat can be transferred between the sheets through a single graphene sheet, and also through the nanodiamond particles at the carbon atoms of the graphene to transfer heat upwards and downwards along the normal direction of the graphene to adjacent graphene sheets, thereby improving the thermal conductivity of the composite material.

[0023] 2. In this invention, a diamond / graphene preform is placed in a vacuum atmosphere furnace and heated. After evacuation, an inert gas is introduced to prevent oxygen from reacting with the diamond / graphene preform during heating. The carbon-containing gas introduced during the heating reaction provides a carbon source for the diamond / graphene preform, promoting the bonding of diamond and graphene to generate SP. 2 -SP 3 The intermediate hybrid products form a certain carbon skeleton, which can strengthen the three-dimensional structure connected by nanodiamond particles between graphene sheets, making heat transfer more efficient.

[0024] 3. This invention uses ultrasonic and magnetic stirring in the liquid phase method to uniformly disperse and mix graphene and nanodiamond powders, ensuring the structural integrity of graphene and nanodiamond, and avoiding damage to the graphene / nanodiamond mixed powder by the stirrer in mechanical stirring.

[0025] 4. The preforms in this invention can be pressed at room temperature and atmospheric environment, which reduces the requirements for preform preparation facilities, simplifies the operation process, and shortens the preparation cycle. Attached Figure Description

[0026] Figure 1 The images show the Raman diagrams of the diamond / graphene aluminum-based composite materials obtained in Examples 1-3. Detailed Implementation

[0027] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any reasonable combination of the specific embodiments.

[0028] Specific Implementation Method 1: The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material in this implementation method is carried out according to the following steps:

[0029] I. Weighing materials:

[0030] Weigh out a certain mass of nanodiamond powder and graphene;

[0031] The mass ratio of the nanodiamond powder to graphene is (98~99):(1~2).

[0032] II. Mixed Powder

[0033] Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder.

[0034] III. Precast Molding

[0035] The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform.

[0036] The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 5~15MPa, and the pressure holding time is 5~10min;

[0037] IV. Formation of the carbon skeleton

[0038] The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton.

[0039] The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is heated to 1200~1500℃ at 5~10℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 5~8 kPa and the gas flow rate is 0.04~0.06L / min.

[0040] The carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1;

[0041] V. Room temperature self-venting pressure impregnation

[0042] A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material.

[0043] The pressure for pressure impregnation is 10~50MPa.

[0044] This embodiment has the following beneficial effects:

[0045] 1. In this embodiment, graphene and nanodiamond are first dispersed and mixed using a liquid-phase method. Due to the compatibility between the surfaces of nanodiamond and graphene, the free groups on the graphene surface interact with the groups on the surface of nanodiamond particles, causing the nanodiamond particles to be adsorbed onto the carbon atoms of the graphene planar network. The graphene sheets are connected by nanodiamond particles to form a three-dimensional structure. In heat transfer, heat can be transferred between the sheets through a single graphene sheet, and also through the nanodiamond particles at the carbon atoms of the graphene to transfer heat upwards and downwards along the normal direction of the graphene to adjacent graphene sheets, thereby improving the thermal conductivity of the composite material.

[0046] 2. In this embodiment, the diamond / graphene preform is placed in a vacuum atmosphere furnace and heated. After evacuation, an inert gas is introduced to prevent oxygen from reacting with the diamond / graphene preform during heating. The carbon-containing gas introduced during the heating reaction provides a carbon source for the diamond / graphene preform, promoting the bonding of diamond and graphene to generate SP. 2 -SP 3 The intermediate hybrid products form a certain carbon skeleton, which can strengthen the three-dimensional structure connected by nanodiamond particles between graphene sheets, making heat transfer more efficient.

[0047] 3. In this embodiment, ultrasonic and magnetic stirring in the liquid phase method are used to uniformly disperse and mix graphene and nanodiamond powders, and to ensure the structural integrity of graphene and nanodiamond, avoiding the damage to the graphene / nanodiamond mixed powder by the stirrer in mechanical stirring.

[0048] 4. In this embodiment, the preform can be pressed at room temperature and atmospheric environment, which has low requirements for the preform preparation facilities, simple operation process and can shorten the preparation cycle.

[0049] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the particle size of the nanodiamond powder mentioned in step one is 5~10nm, the purity is 98%, and the average specific surface area of ​​the nanodiamond powder is 350m². 2 / g.

[0050] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that the ultrasonic dispersion time in step 2 is 15~30 min.

[0051] Specific Implementation Method Four: This implementation method differs from one of the specific implementation methods one to three in that the magnetic stirring time in step two is 20 to 30 minutes.

[0052] Specific Implementation Method 5: This implementation method differs from Specific Implementation Methods 1 to 4 in that the drying temperature in step 2 is 100°C and the drying time is 4 hours.

[0053] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the temperature of the water bath in step two is 20°C.

[0054] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that the inert gas mentioned in step four is argon.

[0055] Specific Implementation Method Eight: This implementation method differs from one of the specific implementation methods one to seven in that the preheating temperature in step five is 100~400℃.

[0056] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that the aluminum substrate mentioned in step five is pure aluminum, 2024 aluminum alloy, or 6061 aluminum alloy.

[0057] Specific Implementation Method 10: This implementation method differs from Specific Implementation Methods 1 to 9 in that: the purity of the pure aluminum mentioned in step 5 is 99.99%; and the purity of the graphene mentioned in step 1 is 99.9%.

[0058] Example 1

[0059] The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material in this embodiment is carried out according to the following steps:

[0060] I. Weighing materials:

[0061] Weigh out a certain mass of nanodiamond powder and graphene;

[0062] The nanodiamond powder has a particle size of 5 nm, a purity of 98%, and an average specific surface area of ​​350 m². 2 / g;

[0063] The graphene has a purity of 99.9%;

[0064] The mass ratio of the nanodiamond powder to graphene is 99:1;

[0065] II. Mixed Powder

[0066] Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder.

[0067] The ultrasonic dispersion time is 15 min;

[0068] The magnetic stirring time is 30 minutes.

[0069] The drying temperature is 100℃ and the time is 4 hours;

[0070] The temperature of the water bath is 20°C;

[0071] III. Precast Molding

[0072] The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform.

[0073] The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 5MPa, and the pressure holding time is 8min;

[0074] IV. Formation of the carbon skeleton

[0075] The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton.

[0076] The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is raised to 1200℃ at 8℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 7 kPa and the gas flow rate is 0.04L / min.

[0077] The inert gas is argon; the carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1;

[0078] V. Room temperature self-venting pressure impregnation

[0079] A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material.

[0080] The preheating temperature is 200℃;

[0081] The pressure for the pressure impregnation is 30 MPa;

[0082] The aluminum matrix is ​​pure aluminum;

[0083] The pure aluminum content is 99.99%; the diamond / graphene aluminum-based composite material with a density of 98% obtained in Example 1 was tested and found to have a thermal conductivity of 500 W / (m·K) in the graphene sheet direction and 60 W / (m·K) in the normal direction of the graphene sheet.

[0084] Example 2

[0085] The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material in this embodiment is carried out according to the following steps:

[0086] I. Weighing materials:

[0087] Weigh out a certain mass of nanodiamond powder and graphene;

[0088] The nanodiamond powder has a particle size of 5 nm, a purity of 98%, and an average specific surface area of ​​350 m². 2 / g;

[0089] The graphene has a purity of 99.9%;

[0090] The mass ratio of the nanodiamond powder to graphene is 99:1;

[0091] II. Mixed Powder

[0092] Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder.

[0093] The ultrasonic dispersion time is 15 min;

[0094] The magnetic stirring time is 30 minutes.

[0095] The drying temperature is 100℃ and the time is 4 hours;

[0096] The temperature of the water bath is 20°C;

[0097] III. Precast Molding

[0098] The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform.

[0099] The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 5MPa, and the pressure holding time is 8min;

[0100] IV. Formation of the carbon skeleton

[0101] The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton.

[0102] The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is raised to 1200℃ at 8℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 7 kPa and the gas flow rate is 0.04L / min.

[0103] The inert gas is argon; the carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1;

[0104] V. Room temperature self-venting pressure impregnation

[0105] A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material.

[0106] The preheating temperature is 200℃;

[0107] The pressure for the pressure impregnation is 30 MPa;

[0108] The aluminum matrix is ​​pure aluminum;

[0109] A diamond / graphene aluminum-based composite material with a density of 99% was obtained according to the processing method of Example 2. The thermal conductivity of this material is 550 W / (m·K) in the direction of the graphene sheets and 75 W / (m·K) in the direction normal to the graphene sheets.

[0110] Example 3

[0111] The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material in this embodiment is carried out according to the following steps:

[0112] I. Weighing materials:

[0113] Weigh out a certain mass of nanodiamond powder and graphene;

[0114] The nanodiamond powder has a particle size of 5 nm, a purity of 98%, and an average specific surface area of ​​350 m². 2 / g;

[0115] The graphene has a purity of 99.9%;

[0116] The mass ratio of the nanodiamond powder to graphene is 98:2;

[0117] II. Mixed Powder

[0118] Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder.

[0119] The ultrasonic dispersion time is 15 min;

[0120] The magnetic stirring time is 30 minutes.

[0121] The drying temperature is 100℃ and the time is 4 hours;

[0122] The temperature of the water bath is 20°C;

[0123] III. Precast Molding

[0124] The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform.

[0125] The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 10MPa, and the pressure holding time is 8min;

[0126] IV. Formation of the carbon skeleton

[0127] The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton.

[0128] The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is raised to 1200℃ at 8℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 7 kPa and the gas flow rate is 0.04L / min.

[0129] The inert gas is argon; the carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1;

[0130] V. Room temperature self-venting pressure impregnation

[0131] A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material.

[0132] The preheating temperature is 200℃;

[0133] The pressure for the pressure impregnation is 30 MPa;

[0134] The aluminum matrix is ​​pure aluminum, 2024 aluminum alloy, or 6061 aluminum alloy;

[0135] A diamond / graphene aluminum-based composite material with a density of 99% was obtained according to the processing method of Example 3. The thermal conductivity of the material in the graphene sheet direction was 650 W / (m·K) and 100 W / (m·K) in the graphene sheet normal direction. Figure 1 The images show the Raman diagrams of the diamond / graphene aluminum-based composite materials obtained in Examples 1-3. Figure 1 This demonstrates that the diamond / graphene reinforced aluminum matrix composites obtained in Examples 1-3 have low defect content and excellent performance.

Claims

1. A method for preparing an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material, characterized in that: The preparation method of ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material is carried out according to the following steps: I. Weighing materials: Weigh out a certain mass of nanodiamond powder and graphene; The mass ratio of the nanodiamond powder to graphene is (98~99):(1~2). II. Mixed Powder Nanodiamond powder and graphene were ultrasonically dispersed in anhydrous ethanol under water bath conditions, then magnetically stirred, and finally dried to obtain a diamond / graphene mixed powder. III. Precast Molding The uniformly mixed diamond / graphene powder obtained in step two is passed through a 200-mesh sieve, then placed into a cold press and cold-pressed to obtain a diamond / graphene preform. The cold pressing process is as follows: the inner diameter of the cold pressing mold is 30cm, the cold pressing pressure is 5~15MPa, and the pressure holding time is 5~10min; IV. Formation of the carbon skeleton The diamond / graphene preform obtained in step three is placed in a vacuum atmosphere furnace for heating and reaction to obtain a preform with a carbon skeleton. The heating reaction process is as follows: before the heating reaction, a vacuum is drawn, then an inert gas is introduced to remove oxygen, then a mixed gas composed of carbon atom gas and inert gas is introduced, and finally the temperature is heated to 1200~1500℃ at 5~10℃ / min and held for 6h. During the heating and holding process, the pressure of the mixed gas is 5~8 kPa and the gas flow rate is 0.04~0.06L / min. The carbon-containing gas is C3H8; the volume ratio of the carbon-containing gas to the inert gas in the mixed gas is 1:1; V. Room temperature self-venting pressure impregnation A preform with a carbon skeleton is placed in a mold and preheated. Then, an aluminum matrix is ​​melted and impregnated into the preform with a carbon skeleton by self-venting pressure. After cooling, the preform is demolded to obtain an ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material. The pressure for pressure impregnation is 10~50MPa; The nanodiamond powder mentioned in step one has a particle size of 5-10 nm, a purity of 98%, and an average specific surface area of ​​350 m². 2 / g; The preheating temperature described in step five is 100~400℃.

2. The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The ultrasonic dispersion time in step two is 15~30 min.

3. The preparation method of the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The magnetic stirring time in step two is 20-30 minutes.

4. The method for preparing the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The drying temperature in step two is 100℃, and the drying time is 4 hours.

5. The method for preparing the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The temperature of the water bath in step two is 20°C.

6. The method for preparing the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The inert gas mentioned in step four is argon.

7. The method for preparing the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 1, characterized in that: The aluminum substrate mentioned in step five is pure aluminum, 2024 aluminum alloy, or 6061 aluminum alloy.

8. The method for preparing the ultra-high thermal conductivity diamond / graphene reinforced aluminum matrix composite material according to claim 7, characterized in that: The purity of the pure aluminum mentioned in step five is 99.99%; the purity of the graphene mentioned in step one is 99.9%.

Images