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Preparation method for high-thermal-conductivity high-heat-dissipation flexible graphite material

A technology of flexible graphite material and flexible graphite sheet, which is applied in metal material coating process, vacuum evaporation coating, coating, etc., can solve the problems of high cost, no heat dissipation, low rolling cost, etc., and achieve good infrared heat dissipation effect, The effect of increasing the specific surface area and saving costs

Active Publication Date: 2016-12-07
广西振钢再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, natural graphite has low calendering cost and poor heat conduction effect, while synthetic heat conduction graphite has good heat conduction effect, but the cost is high, which is dozens of times that of natural graphite, but artificial heat conduction graphite is only good in transverse heat conduction effect, and longitudinal heat conduction is poor. almost no heat dissipation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A layer of 5nm copper film is grown on the surface of the flexible graphite sheet by sputtering, and heated at 300°C for 5 minutes in a vacuum of 5pa to make the metal film into 5nm metal particles. Introduce hydrogen, continue heating for 30 minutes at a vacuum pressure of 50 Pa, then turn off the hydrogen, infuse methane and heat at a temperature of 500°C for 5 minutes, so that uniform nanofibrous materials can grow on the surface of flexible graphite, and then the obtained material is mixed with Composite with PET film to obtain a molded flexible graphite material with high thermal conductivity and high heat dissipation.

Embodiment 2

[0018] A layer of 25nm iron film was grown on the surface of the flexible graphite sheet by sputtering, and heated at 600°C for 13 minutes in a vacuum of 7pa to make the metal film into 75nm metal particles. Introduce hydrogen, continue heating at 250pa vacuum pressure for 80 minutes, then turn off the hydrogen, infuse methane and heat at 700°C for 20 minutes, so that uniform nanofibrous materials grow on the surface of flexible graphite, and then the obtained material is mixed with Composite with PET film to obtain a molded flexible graphite material with high thermal conductivity and high heat dissipation.

Embodiment 3

[0020] A layer of 50nm copper film is grown on the surface of the flexible graphite sheet by sputtering, and heated at 900°C for 20 minutes in a vacuum of 9pa to make the metal film into 150nm metal particles. Introduce hydrogen, continue heating at a vacuum pressure of 400 Pa for 120 minutes, then turn off the hydrogen, infuse methane and heat at a temperature of 900°C for 30 minutes, so that uniform nanofibrous materials grow on the surface of flexible graphite, and then the obtained material is mixed with Composite with PET film to obtain a molded flexible graphite material with high thermal conductivity and high heat dissipation.

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Abstract

The invention discloses a preparation method for a high-thermal-conductivity high-heat-dissipation flexible graphite material and relates to a preparation method for a graphite material. The preparation method mainly comprises the following steps that 1, a layer of metallic thin film is grown on the surface of a flexible graphite sheet through a sputtering method, a chemical method and other methods; 2, heating is conducted in vacuum, so that the metallic thin film becomes metallic particles; 3, hydrogen is injected, and heating is continuously conducted in the vacuum; 4, injecting of the hydrogen is stopped, and heating is conducted after organic gas is injected; and 5, an obtained material and a PET thin film are composited. According to the preparation method for the high-thermal-conductivity high-heat-dissipation flexible graphite material, the high-thermal-conductivity effect of the graphite sheet is kept, and meanwhile the surface infrared heat dissipation effect is improved; an ideal heat dissipation effect can be achieved without using a metal radiator, the size of an electronic device is greatly decreased, and the preparation method has an important significance to wide application of flexible graphite.

Description

technical field [0001] The invention relates to a preparation method of a graphite material, in particular to a preparation method of a flexible graphite material with high thermal conductivity and high heat dissipation. Background technique [0002] With the development of modern science and technology, the design and production of instruments, equipment, and components are developing towards miniaturization, light weight, compactness, and high efficiency. It is becoming more and more obvious that a large amount of heat will be generated, and the heat will directly affect the working stability and safety reliability of electronic devices. Therefore, with the increasingly widespread civil and industrial heat dissipation requirements, heat dissipation and heat conduction have become a major problem in the development of industrial technology. There is an urgent need for high thermal conductivity materials. High thermal conductivity materials bring new technical solutions to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/18C23C14/34C23C14/58
Inventor 于庆先刘通赵支丹侯永平刘蕾邵春妍
Owner 广西振钢再生资源有限公司