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Graphene foam and preparation method thereof, graphene carbon composite material and preparation method thereof

A graphene foam and composite material technology, applied in the direction of graphene, carbon compounds, heat exchange materials, etc., can solve the problems of lack of strong directional thermal conductivity and low thermal conductivity, and achieve improved thermal conductivity and high thermal conductivity. , the effect of improving the thermal conductivity

Pending Publication Date: 2019-10-22
CHANGZHOU FUXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although carbon-carbon composites can achieve a certain structural strength, their thermal conductivity is still not high, the thermal conductivity is tens to hundreds of W / m K, and there is no strong directional thermal conductivity.

Method used

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  • Graphene foam and preparation method thereof, graphene carbon composite material and preparation method thereof
  • Graphene foam and preparation method thereof, graphene carbon composite material and preparation method thereof
  • Graphene foam and preparation method thereof, graphene carbon composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment approach

[0071] As a third embodiment of the present invention, a graphene-carbon composite material is provided, including graphene and a carbon material filled between graphene layers. The density of graphene carbon composite material is 1.0-2.2g / cm 3 , for example: 1.0g / cm 3 , 1.1g / cm 3 , 1.2g / cm 3 , 1.3g / cm 3 , 1.4g / cm 3 , 1.5g / cm 3 , 1.6g / cm 3 , 1.7g / cm 3 , 1.8g / cm 3 , 1.9g / cm 3 , 2.0g / cm 3 , 2.1g / cm 3 , 2.2g / cm 3,Wait. The mass fraction of graphene in the graphene-carbon composite material is 5-80wt%, for example: 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 12wt%, 15wt%, 20wt%, 25wt%, 30wt% %, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 72wt%, 75wt%, 78wt%, 79wt%, 80wt%, etc., the mass fraction of carbon material is 20 -95wt%, for example: 20wt%, 21wt%, 22wt%, 25wt%, 28wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt% , 80wt%, 85wt%, 88wt%, 90wt%, 91wt%, 92wt%, 93wt%, 94wt%, 95wt%, etc. The thermal conductivity of graphene carbon compo...

Embodiment 1A

[0077] This example shows the preparation process of the plate-shaped graphene foam.

[0078] Step 1): Cut the in-plane oriented assembled graphene oxide film with a thickness of 200 μm into sheets, and the cross-sectional SEM image of the graphene oxide film is shown in figure 1 shown.

[0079] Step 2): sandwich the graphene oxide sheet between two graphite papers, put it into a high-temperature furnace, and raise the temperature to 400°C at a rate of 0.1°C / min in an air environment; replace the air with nitrogen, and heat up to 2°C Raise the temperature to 1000°C at a rate of / min to obtain a thickness of 0.5mm and a density of 0.15g / cm 3 , graphene foam with a thermal conductivity of 150W / m K, the SEM image of graphene foam figure 2 shown.

Embodiment 1B

[0081] This example shows the preparation process of using the graphene foam of Example 1A to prepare a plate-shaped graphene-carbon composite material.

[0082] Step 1): Put the graphene foam into a high-temperature and high-pressure impregnation carbonization furnace, add coal tar pitch, adjust the pressure in the furnace to 100MPa, raise the temperature to 450°C at a rate of 10°C / min, and keep it warm for 1h; The temperature was raised to 570°C at a rate of 1 min, and the temperature was kept for 2 hours to obtain a composite material of composite carbon material between the inner layers of the graphene foam.

[0083] Step 2): Put the composite material of the graphene foam inner interlayer composite carbon material in step 1) into a graphitization furnace, heat up to 1800°C at a rate of 10°C / min, and heat treatment time is 3h; at 5°C / min The temperature is raised to 2850°C at a high rate, and the heat treatment time is 3h, and the thickness is 0.5mm, the density is 1.6g / cm ...

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Abstract

The invention provides a graphene foam and a preparation method thereof, and a graphene carbon composite material and a preparation method thereof. The graphene carbon composite material comprises graphene and a carbon material filled between the layers of graphene. According to the invention, the graphene carbon composite material with different heat conduction properties can be set according todifferent content of graphene and carbon. The graphene carbon composite material provided by the invention has very high heat conduction performance along a targeted direction.

Description

technical field [0001] The invention relates to the field of high thermal conductivity materials, in particular to a graphene-carbon composite material and a preparation method thereof. Background technique [0002] Carbon-carbon composites are carbon matrix composites reinforced by carbon fibers and their fabrics. They have excellent mechanical properties and chemical inertness, and are widely used in aerospace, automobile industry, medicine and other fields. [0003] In the prior art, the embryo body of carbon-carbon composite material is prepared by weaving carbon fiber, etc., and then impregnated with other substances, formed by carbonization, graphitization, or a composite material formed by depositing carbon by CVD. [0004] Although carbon-carbon composites can achieve a certain structural strength, their thermal conductivity is still not high, with a thermal conductivity of tens to hundreds of W / m·K, and there is no strong directional thermal conductivity. [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194C09K5/14
CPCC01B32/184C01B32/194C09K5/14C01B2204/24C01B2204/20
Inventor 周步存周仁杰卢静
Owner CHANGZHOU FUXI TECH CO LTD
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