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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 oxidized, its thermal conductivity and heat dissipation performance will be greatly reduced
Gold and silver have better thermal conductivity, but the disadvantage is that the cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First choose polyimide as the raw material, the thickness of polyimide is 15μm, and the thickness of graphite paper is 2mm. 1 piece of polyimide film, cross-stacked, and finally placed in a graphite boat. Then vacuumize the carbonization furnace to less than 5-10Pa, and then put the graphite boat filled with raw materials into the carbonization furnace for carbonization. It takes 0.5h to raise the temperature to 200°C in the first stage, 0.5h to 400°C in the second stage, and 0.5h to raise the temperature to 400°C in the third stage. It takes 1 hour to raise the temperature to 600°C for the first stage, 1 hour for the fourth stage to 800°C, 2.5 hours for the fifth stage to 1000°C, and 2.5 hours for the sixth stage to 1200°C. Finally, the carbonized material is moved to a graphitization furnace, and 20 g / cm2 is applied to the material, and it is carried out under an argon atmosphere. It takes 2 hours to raise the temperature to 1800°C, 2 hours to raise the temperature t...

Embodiment 2

[0025] First select polybenzoxazole as the raw material, the thickness is 30 μm, and the thickness of graphite paper is 3 mm. Cut the polybenzoxazole and graphite paper into a certain size for later use, and put 10 pieces of polybenzoxazole between every two pieces of graphite paper. Benzoxazole thin films, cross-stacked, and finally placed in graphite boats. Then vacuumize the carbonization furnace to less than 5-10Pa, and then put the graphite boat filled with raw materials into the carbonization furnace for carbonization. It takes 0.5h to raise the temperature to 200°C in the first stage, 0.5h to 400°C in the second stage, and 0.5h to raise the temperature to 400°C in the third stage. It takes 0.5 hours to raise the temperature to 600°C in the first stage, 1.5 hours to raise the temperature to 800°C in the fourth stage, 2 hours to raise the temperature to 1000°C in the fifth stage, and 3 hours to raise the temperature to 1200°C in the sixth stage. Finally, move the carboniz...

Embodiment 3

[0027] First select polythiazole as raw material, the thickness is 50 μm, and the thickness of graphite paper is 4 mm. Cut the polythiazole and graphite paper into a certain size and specification for later use. Put 30 pieces of polythiazole film between every two pieces of graphite paper, and stack them crosswise , and finally placed in a graphite boat. Then vacuumize the carbonization furnace to less than 5-10Pa, and then put the graphite boat filled with raw materials into the carbonization furnace for carbonization. It takes 0.5h to raise the temperature to 200°C in the first stage, 0.5h to 400°C in the second stage, and 0.5h to raise the temperature to 400°C in the third stage. It takes 0.5 hours to raise the temperature to 600°C for the first stage, 1 hour for the fourth stage to 800°C, 3 hours for the fifth stage to 1000°C, and 2.5 hours for the sixth stage to 1200°C. Finally, the carbonized material is moved to the graphitization furnace, and 35 g / cm2 is applied to the...

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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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