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Preparation method of foam graphene thermal interface material with high heat conducting property

A technology of foamed graphene and thermal interface material is applied in the field of providing new materials for the thermal interface layer, which can solve the problems of small elasticity and poor flexibility, and achieve the effects of excellent thermal conductivity, good flexibility and easy availability.

Inactive Publication Date: 2015-03-25
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The present invention aims at the defects of poor flexibility and low elasticity of existing carbon-based high thermal conductivity materials, and provides a method for preparing a foamed graphene thermal interface material with high thermal conductivity and good flexibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select natural flake graphite with a particle size of 32 mesh, acidify intercalation with sulfuric acid, potassium permanganate, and hydrogen peroxide, and use a centrifuge to wash to neutral to obtain graphene oxide; select carbon nanotubes with a diameter of 20nm and a length of 10μm , acidifying the carbon nanotubes with a concentrated nitric acid / concentrated sulfuric acid mixed solution for 4 hours. Prepare graphene oxide / acidified carbon nanotube aqueous solution, wherein the mass ratio of graphene oxide to acidified carbon nanotube is 1:1. Pour the mixed solution into a tetrafluoroethylene-lined hydrothermal reaction kettle for hydrothermal reaction, add 0.1M ascorbic acid solution, the hydrothermal reaction temperature is 150°C, and the hydrothermal reaction time is 6 hours. After the reaction, graphene is obtained Hydrogels. The hydrogel was cut into slices, then frozen and sliced ​​with a cryostat with a slice thickness of 3 mm. The graphene foam thermal int...

Embodiment 2

[0022] Select natural flake graphite with a particle size of 32 mesh, acidify intercalation with sulfuric acid, potassium permanganate, and hydrogen peroxide, and use a centrifuge to wash to neutral to obtain graphene oxide; select carbon nanotubes with a diameter of 50nm and a length of 30μm , acidifying the carbon nanotubes with a concentrated nitric acid / concentrated sulfuric acid mixed solution for 4 hours. Prepare graphene oxide / acidified carbon nanotube aqueous solution, wherein the mass ratio of graphene oxide to acidified carbon nanotube is 2:1. Pour the mixed solution into a tetrafluoroethylene-lined hydrothermal reaction kettle for hydrothermal reaction, add 0.1M ascorbic acid solution, the hydrothermal reaction temperature is 180°C, and the hydrothermal reaction time is 8 hours. After the reaction, graphene is obtained Hydrogels. The hydrogel was cut into slices, then frozen and sliced ​​with a cryostat with a thickness of 2 mm. The graphene foam thermal interface...

Embodiment 3

[0024] Select natural flake graphite with a particle size of 80 mesh, acidify intercalation with sulfuric acid, potassium permanganate, and hydrogen peroxide, and use a centrifuge to wash to neutral to obtain graphene oxide; select carbon nanotubes with a diameter of 100nm and a length of 30μm , acidifying the carbon nanotubes with a concentrated nitric acid / concentrated sulfuric acid mixed solution for 6 hours. Prepare graphene oxide / acidified carbon nanotube aqueous solution, wherein the mass ratio of graphene oxide to acidified carbon nanotube is 3:1. Pour the mixed solution into a tetrafluoroethylene-lined hydrothermal reaction kettle for hydrothermal reaction, add 0.2M ascorbic acid solution, the hydrothermal reaction temperature is 150°C, and the hydrothermal reaction time is 6 hours. After the reaction, graphene is obtained Hydrogels. The hydrogel was cut into slices, then frozen and sliced ​​with a cryostat with a thickness of 1 mm. The graphene foam thermal interfac...

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Abstract

The invention relates to a preparation method of a foam graphene thermal interface material with high heat conducting property. The preparation method comprises the following steps: preparing hydrogel with a carbon nanotube reinforced graphene three-dimensional porous structure by utilizing a hydrothermal synthesis method, preparing foam graphene by utilizing a freeze-drying method, wherein a carbon nanotube wound in the graphene three-dimensional porous structure plays a role in reinforcing the graphene Intercalation acting force, the stability of the graphene three-dimensional porous structure can be improved, and the foam graphene has good flexibility. In addition, the high heat conducting property on the graphene two-dimensional plane can be extended into a three-dimensional space through the graphene three-dimensional porous structure, the foam graphene is endowed with excellent macroscopic heat conducting property. The foam graphene thermal interface material is applicable to components of electronic devices, thermal interface heat-conducting layers in an electronically packaged thermal management system, and the like.

Description

technical field [0001] The invention relates to a preparation technology of a foamed graphene flexible thermal interface material with high thermal conductivity, in particular it can provide a new material for an interface thermal conduction layer of a thermal management system in the field of electronic devices or electronic packaging. Background technique [0002] Due to the rapid development of integrated circuits and packaging technology, the volume of electronic devices and logic circuits in computers has been reduced by thousands of times. In order to dissipate the heat generated during the operation of electronic devices in time to prevent device failure due to overheating, often It is required to use materials with good thermal conductivity as the heat dissipation substrate. Taking a notebook computer as an example, due to limitations such as small internal space and difficulty in heat dissipation, it is impossible for a notebook computer to increase the speed and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 吕鹏韦玮余柯涵谈晓文沈骁
Owner NANJING UNIV OF POSTS & TELECOMM
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