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Compressed expanded graphite heat conduction composite material and preparation method thereof

A technology of compression expansion and graphite heat conduction, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of affecting thermal conductivity, compression and expansion graphite heat conduction network damage, etc., and achieve the effect of reducing damage and increasing thermal conductivity

Active Publication Date: 2019-04-30
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the impregnation process, due to the fluidity of the liquid, especially the polymer with a large molecular weight, it will break the overlap between the graphite sheet and the graphite sheet, so it will cause certain damage to the heat conduction network of the compressed and expanded graphite. Affect thermal conductivity

Method used

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  • Compressed expanded graphite heat conduction composite material and preparation method thereof
  • Compressed expanded graphite heat conduction composite material and preparation method thereof
  • Compressed expanded graphite heat conduction composite material and preparation method thereof

Examples

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preparation example Construction

[0037] see figure 1 , is the flow chart of the preparation method of the compressed expanded graphite heat-conducting composite material provided by the present invention, comprising the following steps:

[0038] S1, preparing compressed expanded graphite;

[0039] To prepare compressed expanded graphite, the following two steps are required:

[0040] Firstly, expandable graphite is obtained after graphite is oxidized by strong acid intercalation, and expanded graphite is obtained by high temperature expansion;

[0041] In the present invention, high temperature expansion method or microwave expansion method is adopted to prepare expanded graphite from expandable graphite. Among them, the high-temperature expansion method generally uses a high-temperature furnace to heat, and reacts for 10-30s under the condition of 800-1000°C, so as to obtain expanded graphite. In the microwave expansion method, expandable graphite is placed in microwave equipment for heating, and expandab...

Embodiment 1

[0052] This embodiment relates to a method for preparing a thermally conductive composite material of compressed expanded graphite, comprising the following steps:

[0053] (1), prepare compressed expanded graphite;

[0054] Weigh the expanded graphite, and then compress the expanded graphite to obtain compressed expanded graphite. The density of compressed expanded graphite described in the present embodiment is 0.1g / cm 3 . The compressed expanded graphite includes a plurality of graphite sheets, and the plurality of graphite sheets are stacked to form compressed expanded graphite. For ease of calculation, in this embodiment, the compressed expanded graphite is a cubic compressed expanded graphite block with a side length of 1 cm. Of course, the compressed expanded graphite can also be in other shapes, which are not limited in this embodiment.

[0055] (2), adopting chemical vapor infiltration method to deposit pyrolytic carbon on compressed expanded graphite block;

[00...

Embodiment 2

[0064] The preparation method of the compressed expanded graphite thermally conductive composite material in this implementation is basically the same as that of the compressed expanded graphite thermally conductive composite material in Example 1, the difference being that the compressed expanded graphite used in this implementation has a density of 0.2g / cm 3 ; In addition, the density of the pyrolytic carbon is 0.01g / cm 3 .

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Abstract

The invention provides a preparation method of a compressed and expanded graphite heat conduction composite material. The preparation method includes the steps of S1), preparing compressed and expanded graphite; S2), subjecting the prepared compressed and expanded graphite to sediment in pyrolytic carbon with chemical vapor infiltration, wherein a gas adopted in the chemical vapor infiltration is a mixed gas of argon and methane; S3), filling of organic fillers into the compressed and expanded graphite subjected to sediment in pyrolytic carbon to obtain the compressed and expanded graphite heat conduction composite material. The invention further provides the compressed and expanded graphite heat conduction composite material obtained with the preparation method and an encapsulating material applying the compressed and expanded graphite heat conduction composite material.

Description

technical field [0001] The invention relates to the field of preparation of graphite composite materials, in particular to a compression-expanded graphite heat-conducting composite material and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of industry, especially the rise of the electronic field and the emergence of a large number of high-power devices, the problem of heat dissipation and heat transfer has become a bottleneck that limits the further improvement and optimization of these products. In many fields, metals have been used as the main material for thermal management due to their high heat transfer efficiency, but for metals, polymer materials have more excellent properties, such as low density, stronger oxidation resistance, Corrosion resistance and higher processing performance. However, most polymer materials are poor conductors of heat, so the development of high thermal conductiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C08L83/04C08K7/24C08K3/04C08L91/06C08L63/00C08L61/06
CPCC08K3/04C08K7/24C09K5/14C08L83/04C08L91/06
Inventor 杜鸿达陈威干林李佳徐成俊褚晓东姚有为李宝华杨全红贺艳兵康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV