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High-thermal conductivity graphite heat-dissipation membrane making technology

A technology of high thermal conductivity graphite and production process, which is applied in the field of high thermal conductivity graphite heat dissipation film production process, which can solve the problems of low thermal conductivity, heat dissipation materials that cannot meet product requirements, high density and difficult processing, etc.

Inactive Publication Date: 2016-11-09
黄志良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of electronic devices and products in the field of high integration and high computing, the requirements for the portability and operating speed of electronic products are getting higher and higher. However, the heat generated during high-speed operation is not easy to discharge, resulting in local high temperature. Reduce the performance and service life of electronic products, so heat dissipation is becoming an urgent problem to be solved
[0003] Traditional heat dissipation materials are generally aluminum, copper, silver, gold and other metal alloys. However, as the volume of electronic products becomes smaller and the heat generation increases, the existing heat dissipation materials can no longer meet the requirements of the products.
The thermal conductivity of aluminum is low, and the thermal conductivity of copper is higher than that of aluminum, but the density is higher, it is not easy to process, and it is not resistant to corrosion. The thermal conductivity of silver and gold is higher than that of copper, but the production cost is too high
[0004] At present, graphite materials can replace traditional heat dissipation materials. The existing graphite heat dissipation materials are divided into natural graphite paper and artificial graphite film. Natural graphite paper is obtained from natural graphite as raw material and other auxiliary materials under high temperature and high pressure. Falling powder causes secondary pollution, and the thickness is difficult to control
The existing synthetic graphite film is mainly obtained from polyimide film through two processes of carbonization and graphitization, but its thermal conductivity, flexibility and surface finish are not very ideal.

Method used

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Experimental program
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Embodiment Construction

[0024] The following examples are given to further describe the present invention in detail.

[0025] A manufacturing process of high thermal conductivity graphite heat dissipation film, select high purity graphite with a density of 2.1g / cm 3 , to make graphite sintering molds, the external dimensions of the mold are designed according to the internal dimensions of the furnace body, and the internal dimensions of the mold are designed according to the size of the sintered graphite film required; the carbon content is ≥ 99%, the thermal conductivity is greater than 400w / mk, and the density is 1.9g / cm 3 , the natural graphite paper with a thickness of 0.15mm is used as the base material and cut into slices according to the size inside the graphite mold; stack the cut natural graphite paper into the graphite mold, and put a 6Kg graphite plate on the top layer for pressure .

[0026] Put the graphite mold with natural graphite paper into the high-temperature graphitization furnac...

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PUM

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Abstract

The invention relates to a high-thermal conductivity graphite heat-dissipation membrane making technology. The technology comprises preparing a graphite mold from high purity graphite, selecting a natural graphite paper as a base material, stacking the cut natural graphite papers in the graphite mold, putting the graphite mold into a high temperature graphitization furnace, carrying out high temperature purification four times, cutting a polymer film to obtain sheets, crosswise stacking the sheets and the purified natural graphite papers in the graphite mold, putting the graphite mold with the raw materials into a carbonizing furnace, putting the carbonized material into the graphitization furnace, cutting the graphitized raw material according to specifications, stacking the graphitized raw material and a release film, putting the stacked materials into a double-roller calendar and carrying out lamination to obtain a high-thermal conductivity graphite film with the smooth surface, uniform thickness and good flexibility. The high-thermal conductivity graphite heat-dissipation membrane has the smooth surface, uniform thickness and good flexibility.

Description

technical field [0001] The invention relates to a manufacturing process of a high thermal conductivity graphite heat dissipation film. Background technique [0002] With the development of electronic devices and products in the field of high integration and high computing, the requirements for the portability and operating speed of electronic products are getting higher and higher. However, the heat generated during high-speed operation is not easy to discharge, resulting in local high temperature. Reduce the performance and service life of electronic products, so heat dissipation has become an urgent problem to be solved. [0003] Traditional heat dissipation materials are generally aluminum, copper, silver, gold and other metal alloys. However, as the volume of electronic products becomes smaller and the heat generation increases, the existing heat dissipation materials can no longer meet the requirements of the products. Aluminum has a low thermal conductivity, copper ha...

Claims

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Application Information

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IPC IPC(8): C04B35/528
CPCC04B35/528C04B2235/9607
Inventor 黄志良
Owner 黄志良
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