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A kind of preparation method of graphene heat dissipation composite material

A composite material, graphene technology, applied in graphene, heat exchange materials, chemical instruments and methods, etc., can solve problems such as unsatisfactory heat dissipation performance and uneven distribution, achieve excellent thermal conductivity and heat dissipation performance, and improve heat flux. , Improve the effect of thermal conductivity

Active Publication Date: 2021-12-21
韦玛实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of unsatisfactory heat dissipation performance caused by material compounding on the surface of graphene in the existing graphene heat dissipation material and the inability to form effective intercalation in the graphene material, and provides a graphene heat dissipation compound Material preparation method

Method used

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  • A kind of preparation method of graphene heat dissipation composite material
  • A kind of preparation method of graphene heat dissipation composite material
  • A kind of preparation method of graphene heat dissipation composite material

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specific Embodiment approach 1

[0024] Specific embodiment one: present embodiment a kind of preparation method of graphene heat dissipation composite material, it is to carry out according to the following steps:

[0025] 1. Combining graphite powder with nano-SiO 2 Mixing, then adding to the absolute ethanol solution, using a high-speed disperser to disperse and mix to obtain a composite slurry;

[0026] Described graphite powder is natural graphite powder or expanded graphite powder;

[0027] 2. Put the composite slurry into the reaction kettle, keep it warm for 0.5h-2h under the condition of stirring speed of 300r / min-500r / min, temperature of 150℃-400℃ and pressure of 40MPa-55MPa, and then start Release the pressure until the pressure is 5MPa to 30MPa, stop the pressure relief, close the pressure valve, and obtain a composite material with high temperature and high pressure reaction;

[0028] 3. Take out the composite material of high temperature and high pressure reaction, then perform supercooling tr...

specific Embodiment approach 2

[0035] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the high-speed disperser described in step 1 performs dispersing and mixing, specifically, the linear velocity of the dispersing head is 99m / s~140m / s and the rotating speed is 21000rpm~30000rpm Under certain conditions, disperse for 15 minutes to 8 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the natural graphite powder described in step 1 is flake graphite powder or microcrystalline graphite powder. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a graphene heat dissipation composite material, which belongs to the application field of graphene products. The present invention aims to solve the problem of unsatisfactory heat dissipation performance caused by material compounding in the existing graphene heat dissipation material being unevenly distributed on the graphene surface layer and unable to form an effective intercalation layer in the graphene material. Preparation method: 1. preparing composite slurry; 2. high temperature and high pressure reaction; 3. supercooling treatment, freeze drying and tablet molding; 4. heating and pressurizing sintering. The invention is used for the preparation of graphene heat dissipation composite material.

Description

technical field [0001] The invention belongs to the application field of graphene products. Background technique [0002] At present, the heat dissipation materials used in most instruments and precision electronic equipment are usually materials with high thermal conductivity. However, with the continuous development and progress of science and technology, modern industries have higher and higher requirements for heat conduction and heat dissipation of instruments. The requirements for the stiffness and toughness of materials are getting higher and higher, and traditional heat dissipation materials can no longer meet the performance conditions required by modern equipment. Graphene has the highest thermal conductivity among known materials, and the thermal conductivity of single-layer graphene at room temperature can reach 5300W·m -1 ·K -1 . Graphene stands out from many heat-conducting materials by virtue of its ultra-strong, ultra-thin and excellent thermal conductivit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C01B32/194C01B32/19
CPCC09K5/14C01B32/194C01B32/19
Inventor 王振廷尹吉勇王辉
Owner 韦玛实业集团有限公司
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