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Expanded graphite and graphene composite material and preparation method therefor

A technology of expanded graphite and composite materials, used in ceramic products, other household appliances, household appliances, etc., can solve the problems of lack of resilience, limited application scope, strict equipment requirements, etc., and achieve the effect of improving resilience performance.

Active Publication Date: 2015-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the existing carbon foams have the following disadvantages: 1. Poor mechanical properties and no resilience. Graphene and mesophase pitch-based carbon foams usually need to be filled with polymers to be used, which limits their application range; 2. , The production process is complicated and the production cost is high. Graphene is a nano-material, which is still in the research and development stage, and the output is low-cost. However, the graphitization process of asphalt requires a high temperature of about 3000 ° C, and the requirements for equipment are very strict.

Method used

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  • Expanded graphite and graphene composite material and preparation method therefor
  • Expanded graphite and graphene composite material and preparation method therefor
  • Expanded graphite and graphene composite material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 100 g of graphene oxide aqueous dispersion with a mass fraction of 0.1%, weigh 1 g of 100-mesh expanded graphite and add the above-mentioned graphene oxide aqueous dispersion, stir and mix evenly to obtain expanded graphite / graphene oxide aqueous dispersion, and place it in an airtight Then place it in a muffle furnace for heat treatment at 120°C for 24 hours, take out the sample after cooling down, and obtain expanded graphite / graphene-based carbon foam after drying, which is a composite material of expanded graphite and graphene. Its thermal conductivity and rebound performance were tested respectively. Its thermal conductivity is 55W / (m·K), and it is compressed 100 times at a compression rate of 70%, and its rebound rate is 90%.

Embodiment 2

[0031]Prepare 100 g of graphene oxide aqueous dispersion with a mass fraction of 10%, weigh 1 g of 300-mesh expanded graphite and add it to the above-mentioned graphene oxide aqueous dispersion, stir and mix evenly to obtain expanded graphite / graphene oxide aqueous dispersion, and place it in an airtight The container is then placed in a muffle furnace for heat treatment at 260°C for 24 hours, and the sample is taken out after cooling down, and the expanded graphite / graphene-based carbon foam is obtained after drying, which is a composite material of expanded graphite and graphene. Its thermal conductivity and rebound performance were tested respectively. Its thermal conductivity is 100W / (m·K), and it is compressed 100 times at a compression rate of 70%, and its rebound rate is 96%.

Embodiment 3

[0033] Prepare 100 g of graphene oxide aqueous dispersion with a mass fraction of 10%, weigh 10 g of 200-mesh expanded graphite and add the above-mentioned graphene oxide aqueous dispersion, stir and mix uniformly to obtain expanded graphite / graphene oxide aqueous dispersion, place it in an airtight The container is then placed in a muffle furnace for heat treatment at 180°C for 12 hours, and the sample is taken out after cooling down, and the expanded graphite / graphene-based carbon foam is obtained after drying, which is a composite material of expanded graphite and graphene. Its thermal conductivity and rebound performance were tested respectively. Its thermal conductivity is 90W / (m·K), and it is compressed 100 times at a compression rate of 70%, and its rebound rate is 92%.

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Abstract

The invention relates to an expanded graphite and graphene composite material and a preparation method therefor. The preparation method comprises the steps: preparing a graphene oxide water dispersion, of which the mass fraction is 0.1-10%; uniformly stirring and mixing expanded graphite, of which the expansion ratio is 100-300, and the graphene oxide water dispersion, so as to obtain a homodisperse expanded graphite / graphene oxide water dispersion; putting the expanded graphite / graphene oxide water dispersion in a closed vessel, putting the closed vessel in a muffle furnace, carrying out heat treatment for 1-24 hours at the temperature of 120-260 DEG C, carrying out cooling, then, taking out samples, and drying the samples, so as to obtain expanded graphite / graphene based carbon foam; and connecting expanded graphite by graphene sheet layers so as to jointly form a three-dimensional network structure, wherein the coefficient of thermal conductivity is greater than or equal to 50W / (m.K), and the rebound degree is greater than or equal to 90%. Compared with the traditional mesophase asphalt based carbon foam, graphene oxide based carbon foam and chemical vapor deposition based graphene based carbon foam, the rebound elasticity, thermal conducting capability, production cost and the like of the expanded graphite and graphene composite material are superior.

Description

technical field [0001] The invention relates to an expanded graphite and graphene composite material and a preparation method, in particular to a preparation method of elastic heat-conducting carbon foam. Background technique [0002] With the rapid development of science and technology, efficient heat conduction and heat dissipation have become key issues in the field of thermal management. With the continuous improvement of the integration and precision of electronic components in electrical devices such as computers, mobile phones, and satellites, the increasing heat generated by electronic devices per unit area has caused a sudden increase in the heat generated by the system. If the heat cannot be quickly dissipated, it will form a large temperature difference with the local materials, which will affect the normal operation of the device. Studies have shown that the stability of electronic components is extremely sensitive to temperature. When the operating temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/536C04B38/00
Inventor 封伟秦盟盟冯奕钰
Owner TIANJIN UNIV
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