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Preparation method of high heat conductivity graphite film

A technology of high thermal conductivity graphite and expanded graphite, which is applied in the field of preparation of high thermal conductivity graphite film, can solve the problems of high cost, complicated process, unfavorable large-scale production, etc., and achieve the effect of high thermal conductivity and simple process

Inactive Publication Date: 2019-02-15
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of graphite film in the prior art has complicated process, high energy consumption, long time consumption and high cost, which is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The embodiment of the present invention provides a kind of preparation method of high thermal conductivity graphite film, it comprises the following steps:

[0028] Step S1, providing an expanded graphite.

[0029] Wherein, the purity of the expanded graphite is greater than 95%. Preferably, the purity of the expanded graphite is 98.65%. The volume of the expanded graphite is 120mL / g-200mL / g.

[0030] Step S2, adding the expanded graphite into a hot-pressing mold, and constantly vibrating the hot-pressing mold so that the expanded graphite is evenly distributed to fill the hot-pressing mold.

[0031] Specifically, the expanded graphite is added to the hot-pressing mold multiple times at a rate of one spoonful at a time through a medicine spoon, so as to avoid blowing up of the expanded graphite during the adding process. And each time the expanded graphite is added, the hot-pressing mold is slightly vibrated, so that the expanded graphite is evenly distributed in the...

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Abstract

The invention relates to a preparation method of a high heat conductivity graphite film. The preparation method comprises the following steps: providing expanded graphite with purity greater than 95%and a size of 120-200 mL / g, adding the expanded graphite into a hot-pressing mold, performing hot pressing on the expanded graphite in the hot-pressing mold for 30-60 min at a temperature of 150-250 DEG C and pressure of 80-120 MPa to form a graphite sheet, taking out the graphite sheet from the hot-pressing mold, heating the graphite sheet at a room temperature at a heating rate of 10 DEG C / min to 220 DEG C, holding the temperature for 30 min, rolling the sheet at working pressure of 80-100 MPa and a rolling speed of 0.5-1 m / s, and repeating heating and rolling till the high heat conductivitygraphite film is prepared.

Description

technical field [0001] The invention relates to a preparation method of a graphite material, in particular to a preparation method of a high thermal conductivity graphite film. Background technique [0002] With the rapid development of the information industry and portable electronic products, microelectronic components and power devices will be more integrated and smaller in size. It has become a technical bottleneck for the continued development of the electronics industry. Graphite film material has excellent electrical and thermal conductivity, coupled with small thermal expansion coefficient and low density. The application of graphite film to electronic products can not only alleviate the shortage of metal heat-conducting materials, but also solve the heat dissipation problem of electronic components and power devices. However, the preparation method of graphite film in the prior art has complicated process, high energy consumption, long time consumption and high co...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622C04B35/626
CPCC04B35/522C04B35/62218C04B35/6268C04B2235/6562C04B2235/6567C04B2235/77C04B2235/9607
Inventor 檀满林刘荣跃郭震田勇陈建军
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN