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Heat-conducting graphite composite material and preparation method thereof

A technology of composite materials and thermally conductive graphite, which is applied in metal processing equipment, transportation and packaging, etc., and can solve problems such as complex configuration, affecting the degree of orientation of flake graphite grains, and cracking of the film layer

Active Publication Date: 2020-10-30
江西宁新新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic Ningbo Materials Institute has accumulated rich experimental data and achievements in this area, and is committed to improving the thermal performance of graphite-aluminum composite materials to 500W·m through casting method -1 ·K -1 ;As far as the casting method is concerned, the slurry configuration is complicated during the operation process, including solvents, binders, plasticizers, dispersants and other additives. Air bubbles must be eliminated before use, and the drying process needs to be slowly dried in a solvent atmosphere. , this is because the casting film layer is thick (above 0.1mm), if the slurry is not well controlled, it will seriously affect the orientation of the flake graphite grains, resulting in cracking of the film layer, uneven thickness, etc., the process is very complex

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  • Heat-conducting graphite composite material and preparation method thereof
  • Heat-conducting graphite composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a kind of preparation method of heat-conducting graphite composite material, it comprises the following steps:

[0027] S1. Use flake graphite as the orientation element, aluminum powder as the matrix, and silicon powder as the interface wetting agent; mix 300g of flake graphite and 700g of aluminum powder, and then mix with 8g of the interface wetting agent to obtain a mixed powder Among them, flake graphite can pass through a 100-mesh sieve, that is, the particle size can be controlled between 20 and 150 microns, and the distribution is wide, which is conducive to increasing the density of the oriented layer.

[0028] S2, using ethyl cellulose as a binding agent, terpineol as a solvent; 10g of binding agent and 180g of solvent are heated and stirred to form a transparent solution, then mixed with 120g of the above-mentioned mixed powder, and ball milled, Get a slurry.

[0029] S3. After the above slurry is printed on the substrate by screen p...

Embodiment 2

[0033] This embodiment provides a kind of preparation method of heat-conducting graphite composite material, it comprises the following steps:

[0034] S1. Use flake graphite as the orientation unit, aluminum powder as the matrix, and silicon powder as the interface wetting agent; mix 200 flake graphite and 800g aluminum powder, and then mix with 5g of the interface wetting agent to obtain a mixed powder .

[0035] S2, with the equal mass ratio mixture of ethyl cellulose, methyl cellulose and nitrocellulose as binder, the equal volume ratio mixture of terpineol and ethylene glycol as solvent; 10g binder and 150g solvent are heated After stirring and mixing to form a transparent solution, it was mixed with 100 g of the above mixed powder to obtain a slurry.

[0036] S3. After the above slurry is printed on the substrate by screen printing, it is then placed in an oven at 90°C for drying treatment, and this step is repeated several times to obtain a thick film with a thickness ...

Embodiment 3

[0040] This embodiment provides a kind of preparation method of heat-conducting graphite composite material, it comprises the following steps:

[0041] S1. Use flake graphite as the orientation unit, aluminum powder as the matrix, and silicon powder as the interface wetting agent; mix 400g of flake graphite and 600g of aluminum powder, and then mix with 10g of the interface wetting agent to obtain a mixed powder Among them, flake graphite can pass through a 100-mesh sieve, that is, the particle size can be controlled between 20 and 150 microns, and the distribution is wide, which is conducive to increasing the density of the oriented layer.

[0042] S2, using the equal mass ratio mixture of methyl cellulose and nitrocellulose as the binder, and the equal volume ratio mixture of ethylene glycol as the solvent; after heating and stirring 10g of the binder and 200g of the solvent to form a transparent solution, then Mix with 150 g of the above mixed powder, and perform ball milli...

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Abstract

The invention is applicable to the technical field of graphite composite materials, and provides a heat-conducting graphite composite material and a preparation method thereof. The preparation methodof the heat-conducting graphite composite material comprises the following steps of mixing flake graphite and aluminum powder, and then mixing the flake graphite and the aluminum powder with an interfacial wetting agent to obtain mixed powder; mixing a binder and a solvent, and then mixing the mixture with the mixed powder to obtain a slurry; printing the slurry onto a substrate through a silk-screen process, and drying the slurry to obtain a thick film; after forming the thick film, carrying out organic matter removal treatment and cold isostatic pressing treatment to obtain a biscuit; and performing discharge plasma sintering on the biscuit to obtain the heat-conducting graphite composite material. The heat-conducting graphite composite material prepared by the preparation method has anobvious highly oriented arrangement, and the degree of orientation is high, so that high heat-conducting property can be achieved on xy surfaces.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a heat-conducting graphite composite material and a preparation method thereof. Background technique [0002] The advancement of science and technology in modern society promotes the rapid development of electronic equipment. High-end electronic industrial devices continue to develop in the direction of high power density, miniaturization, and multifunctional functions. The heat generation and heat flow will become higher and higher. Therefore, the heat dissipation performance of electronic equipment is proposed higher requirement. At present, the heat dissipation structure used in electronic equipment is generally made of metal materials such as aluminum, copper, silver, etc. These metal materials not only have limited thermal conductivity, but also have a heavy mass and a large thermal expansion coefficient, which greatly limits it further widespread us...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00B22F3/105B22F1/00
CPCC22C1/05C22C21/00C22C32/0084B22F3/105B22F2003/1051B22F1/103B22F1/107
Inventor 田家利李亚利邓达琴李海航李江标邓聪秀
Owner 江西宁新新材料股份有限公司
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