Preparation method of graphite film with high heat conductivity

A technology of high thermal conductivity graphite and graphite film, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of reduced thermal conductivity and heat dissipation performance, high cost of copper sheet, non-corrosion resistance, etc., and achieve a good degree of bubbles , Good cell domain size, high heat dissipation effect

Inactive Publication Date: 2014-07-16
JIANGSU YUEDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat dissipation effect of pure copper is second, but in addition to the high cost, the copper sheet is also its disadvantages such as heavy weight and poor corrosion resistance, and once

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] First choose polyimide as the raw material. The thickness of the polyimide is 15μm and the thickness of the graphite paper is 2mm. Cut the polyimide and graphite paper into a certain size for use, and put it between every two pieces of graphite paper. One polyimide film, cross-stacked, and finally placed in a graphite boat. Then the carbonization furnace is first evacuated to within 5-10Pa, and then the graphite boat containing the raw materials is put into the carbonization furnace for carbonization. It takes 0.5h for one stage to heat up to 200℃, and 0.5h for the second stage to heat up to 400℃. It takes 1h to heat up to 600℃ in one stage, 1h to heat up to 800℃ in four stages, 2.5h to heat up to 1000℃ in five stages, and 2.5h to heat up to 1200℃ in six stages. Finally, the carbonized material is moved to the graphitization furnace, and 20 g / cm2 is applied to the material, and it is carried out in an argon atmosphere. It takes 1h to raise the temperat...

Example Embodiment

[0024] Example 2:

[0025] First choose polybenzoxazole as the raw material, the thickness is 30μm, the thickness of graphite paper is 3mm, cut the polybenzoxazole and graphite paper into a certain size for use, and put 10 pieces of polybenzoxazole between every two pieces of graphite paper. The benzoxazole film is cross-stacked and finally placed in a graphite boat. Then the carbonization furnace is first evacuated to within 5-10Pa, and then the graphite boat containing the raw materials is put into the carbonization furnace for carbonization. It takes 0.5h for one stage to heat up to 200℃, and 0.5h for the second stage to heat up to 400℃. It takes 0.5h to heat up to 600°C in the first stage, 1.5h to heat up to 800°C in the fourth stage, 2h to heat up to 1000°C in the fifth stage, and 3h to heat up to 1200°C in the sixth stage. Finally, the carbonized material is moved to the graphitization furnace, and 25 g / cm2 is applied to the material in a nitrogen atmosphere. It takes 0.5h...

Example Embodiment

[0026] Example 3:

[0027] First choose polythiazole as the raw material, the thickness is 50μm, the thickness of graphite paper is 4mm, the polythiazole and graphite paper are cut into a certain size for use, and 30 polythiazole films are placed between every two pieces of graphite paper and stacked crosswise , And finally placed in a graphite boat. Then the carbonization furnace is first evacuated to within 5-10Pa, and then the graphite boat containing the raw materials is put into the carbonization furnace for carbonization. It takes 0.5h for one stage to heat up to 200℃, and 0.5h for the second stage to heat up to 400℃. It takes 0.5h to heat up to 600°C in the first stage, 1h to heat up to 800°C in the fourth stage, 3h to heat up to 1000°C in the fifth stage, and 2.5h to heat up to 1200°C in the sixth stage. Finally, the carbonized material is moved to the graphitization furnace, and 35 g / cm2 is applied to the material, and it is carried out in an argon atmosphere. It takes ...

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Abstract

The invention discloses a preparation method of a graphite film with high heat conductivity. The process comprises the following steps of selecting polymer films as raw materials, and sandwiching graphite paper between the polymer films; placing the polymer films which are spaced by the graphite paper, intersected and overlapped into a carbonization furnace for carbonization, wherein the carbonization is performed in a vacuum environment; transferring into a graphite furnace for graphitization in an inert atmosphere after carbonization. The preparation process is simple, the process is easy to control, and the prepared graphite film has a relatively high heat diffusion coefficient, good stability and excellent resistance to bending, and can be widely applied to high-powder LEDs (light-emitting diodes), electronic products with high heating values, microelectronic integrated circuit packages, motors, automobiles, cables, aerospace and other fields.

Description

technical field [0001] The invention relates to a preparation method of a new material, in particular to a preparation method of a high thermal conductivity graphite film material. technical background [0002] At present, high-power density electronic devices and high-end electronic industrial devices are gradually developing in the direction of miniaturization, compact structure, and high power density. The enhanced export and dissipation of heat generated during operation puts forward higher requirements. For example, due to the rapid increase in the frequency of high-frequency processors in computers, power consumption and heat generation have not decreased. In particular, the heat generated by the processor is not low, and the part close to the CPU core has the highest temperature. At present, the limit temperature of various processors is around 80°C. Without a suitable heat sink, it is very dangerous. Working at high temperature for a long time will inevitably short...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/205
Inventor 赵大伟蔡铜祥杨玉晴
Owner JIANGSU YUEDA NEW MATERIALS TECH
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