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Manufacturing method for graphite film

A manufacturing method and technology of graphite film, which is applied in the field of graphite film, can solve problems such as damage to the surface of carbonized film, and easy welding and sticking between the film surface and the film surface, so as to achieve the effect of reducing sticking and good quality

Inactive Publication Date: 2019-04-05
TAIMIDE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Regardless of whether the carbonized film produced by the multi-sheet (stack firing) or roll continuous (roll firing) process has the problem of welding and sticking between the film surface and the film surface
This phenomenon reduces the probability of defects or damage on the surface of the carbide film

Method used

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  • Manufacturing method for graphite film
  • Manufacturing method for graphite film
  • Manufacturing method for graphite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of flake graphite film.

[0031]

[0032] Sheet carbonized film preparation

[0033] Use polyimide (model: TH5) produced by Damai Technology as a precursor, slice it into lengths and widths of 323mm and 323mm, and use every 5 pieces of polyimide film as a layer, and use between layers 0.25mm graphite spacer paper separated. Heating in a reduced pressure environment, the heating rate is divided into the following sections: 5°C per minute from room temperature to 500°C, 2°C per minute from 500 to 800°C, and 2°C per minute at the highest temperature from 800 to carbonization.

[0034] Flake graphite film preparation

[0035] The above carbonized film is heated under normal pressure and argon gas for graphitization. The heating rate is: 10°C per minute from room temperature to 2000°C, 5°C per minute from 2000 to 2200°C, 3°C per minute from 2200°C, The highest graphitization temperature is 2850°C and the temperature is kept constant for 1 hour.

Embodiment 2

[0037] Repeat the steps of Example 1, except that the rate of carbonization temperature increase from 500 to 800° C. is 1° C. per minute. The heating rate of graphitization is 3°C per minute above 2200°C.

Embodiment 3

[0039] Repeat the steps of Example 1, except that the rate of carbonization temperature increase from 500 to 800° C. is 0.5° C. per minute. The heating rate of graphitization is 3°C per minute above 2200°C.

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Abstract

The invention provides a manufacturing method for a graphite film. A polyimide film is taken as a precursor, and heat treatment conditions are as follows: the average heating rate in a heating sectionof 500-800 DEG C is 2 DEG C or below per minute, and the highest carbonization temperature is 1000 DEG C or higher. According to the manufacturing method for the graphite film, the average heating rate from 2200 DEG C to the highest graphitization temperature is smaller than 3 DEG C per minute, and 2500 DEG C or a higher temperature is the highest graphitization temperature of the process.

Description

technical field [0001] The present invention relates to a manufacturing method of graphite film, in particular refers to heat treatment of polyimide film as a precursor to form carbonized film, and then heat treatment of carbonized film, by controlling the heating rate in a specific temperature section, to obtain better quality graphite film. graphite film. Background technique [0002] The rapid growth of mobile devices has made thinning and lightening a trend in electronic products, and electronic components are closely packed in order to reduce the volume. Therefore, the heat dissipation of chips, backlight modules, and batteries has become an important issue. When the heat conduction and heat dissipation performance requirements are gradually severe, the introduction of artificial soft graphite film can solve these problems. The artificial graphite film has good conductivity, flexibility and four times better thermal conductivity than copper. Graphite film Used heavily ...

Claims

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Application Information

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IPC IPC(8): C01B32/205
Inventor 吴家浩赖昱辰
Owner TAIMIDE TECH