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Preparation method for graphite film as well as product and application of graphite film

A technology of graphite film and product, applied in the field of preparation of graphite film, can solve the problems of increased cost of diamond, unsuitable for enlarged production, difficult to control the uniformity of graphite crystal structure, etc., and achieves the effect of ensuring conductivity and good repeatability

Inactive Publication Date: 2018-09-18
SHUZHOU GU CARBON NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the highest thermal conductivity is only 1056W / (m K), which needs to be improved, and the degree of dispersion of nano-diamonds will make it difficult to control the uniformity of the crystal structure of graphite, the stability of product performance is not good enough, and diamonds increase the cost, which is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method for a graphite film, comprising the steps of:

[0059] (1) Carbonization: The PI film with a thickness of 39 μm is used as the raw material, and the carbonization is carried out in a carbonization furnace with an internal pressure of -1 MPa using the following gradient temperature rise program:

[0060] Put the PI film in a carbonization furnace, heat up to 300°C at a rate of 6°C / min, keep the temperature for 30 minutes, continue to heat up to 400°C at a rate of 1.5°C / min, keep the temperature for 60 minutes, and continue to heat up to 700°C at a rate of 0.5°C / min. Keep the temperature constant for 130 minutes, continue to heat up to 900°C at a rate of 0.3°C / min, keep the temperature constant for 120 minutes, continue to heat up to 1300°C at a rate of 2.5°C / min, keep the temperature for 100 minutes, and cool to obtain a carbonized film;

[0061] (2) Graphitization: the carbonized film obtained in step (1) is graphitized using the following gradient ...

Embodiment 2

[0064] A preparation method for a graphite film, comprising the steps of:

[0065] (1) Carbonization: use the PI film with a thickness of 40 μm as the raw material, and use the following gradient temperature rise program for carbonization in a carbonization furnace with an internal pressure of -0.5 MPa:

[0066] Put the PI film in a carbonization furnace, heat up to 300°C at a rate of 10°C / min, keep the temperature for 30 minutes, continue to heat up to 400°C at a rate of 3.5°C / min, keep the temperature for 60 minutes, and continue to heat up to 700°C at a rate of 1°C / min. Keep the temperature constant for 130 minutes, continue to heat up to 900°C at a rate of 0.7°C / min, keep the temperature constant for 120 minutes, continue to heat up to 1300°C at a rate of 5°C / min, keep the temperature for 100 minutes, and cool to obtain a carbonized film;

[0067] (2) Graphitization: the carbonized film obtained in step (1) is graphitized using the following gradient heating program:

[0...

Embodiment 3

[0070] The only difference from Example 1 is that the thickness of the PI film is 37 μm.

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Abstract

The invention relates to a preparation method for a graphite film. The method comprises the following steps: heating a PI film to temperature of 650-750 DEG C, keeping the temperature for 100-150 min,continuing to raise the temperature to 850-950 DEG C, keeping the temperature for 100-150 min, continuing to raise the temperature to 1250-1350 DEG C, keeping the temperature for 80-130 min, and performing cooling to obtain a carbonized film; and (2) performing graphitization: performing graphitization on the carbonized film obtained in the step (1) by adopting the following gradient heating procedure: heating the carbonized film to temperature of 1550-1650 DEG C, keeping the temperature for 20-60 min, continuing to raise the temperature to 1750-1850 DEG C, keeping the temperature for 20-90 min, continuing to raise the temperature to 2300-2400 DEG C, keeping the temperature for 20-90 min, performing heating to temperature of 2750-2900 DEG C, and performing cooling to obtain the graphite film with high orientation, high crystallinity and high conductivity.

Description

technical field [0001] The invention relates to the technical field of heat-conducting materials, in particular to a preparation method of a graphite film and its product and use. Background technique [0002] With the continuous development of science and technology, the problem of heat dissipation has become a common problem encountered in the development of many fields. For example, the high integration and high density of electronic components in large notebook computer CPUs, mobile phones, and many household appliances make the heat generated on the surface of materials increase sharply. If the heat cannot be removed in time, it will affect the life of electronic components and the system. stability. In addition, in the fields of missile nose cone, solid rocket motor nozzle, aerospace vehicle thermal control system and nuclear fusion reaction, the problem of heat removal is also a scientific and technological difficulty that needs to be solved urgently. Carbon and gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205
CPCC01B32/205
Inventor 赖优萍
Owner SHUZHOU GU CARBON NEW MATERIAL
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