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A kind of preparation method of lightweight high thermal conductivity carbon-based material

A carbon-based material, high thermal conductivity technology, applied in the field of carbon material manufacturing, can solve the problems of high density, decreased thermal conductivity, high thermal expansion coefficient, and achieve the effect of improving specific thermal conductivity, promoting orderly arrangement, and easy graphitization

Active Publication Date: 2017-04-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional metal (aluminum, copper) heat dissipation materials are difficult to meet the development needs due to their high density, high thermal expansion coefficient, and trace impurities that cause a sharp drop in thermal conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the lightweight heat-conducting carbon-based material of the present invention comprises the following steps:

[0022] Step 1. Put the reinforcing body in a strong oxidizing solution for ultrasonic treatment. After the treatment, filter and wash with a large amount of deionized water to remove the residual strong oxidizing solution; the reinforcing body has a room temperature thermal conductivity greater than 500W / m K vapor grown carbon fiber or high thermal conductivity mesophase pitch chopped fiber;

[0023] Step 2, crushing the mesophase pitch and passing through a 300-mesh sieve;

[0024] Step 3. Disperse the reinforcement and mesophase pitch powder prepared in step (1) and step (2) in a large amount of deionized water or ethanol solution according to a certain metering ratio, to obtain a uniform dispersion of reinforcement and mesophase pitch powder Suspension solution; wherein, the mass ratio of reinforcement and mesophase pitch powder ...

Embodiment 1

[0028] 1) Take 50g of commercial vapor-phase grown carbon fiber (thermal conductivity at room temperature greater than 1000W / m·K, aspect ratio greater than 1:1000) into concentrated nitric acid solution in a constant temperature water bath at 60°C and sonicate for 5 hours, then filter and use Rinse with a large amount of deionized water to remove residual nitric acid solution, put the treated fiber into 500ml ethanol solution and stir to disperse, set aside;

[0029] 2) After the mesophase pitch is pulverized into powder, 300 mesh sieves are processed, and 20 g of mesophase pitch powder is added to the ethanol solution of vapor-phase grown carbon fibers;

[0030] 3) After performing high-speed ball milling and sand milling on the mixed solution of vapor-phase grown carbon fiber and mesophase pitch, take it out and pour it into a container, add 2000ml of ethanol to dilute, and use a mechanical mixer to stir the diluted solution;

[0031] 4) Suction-filtering the uniformly dispe...

Embodiment 2

[0036] 1) Take 100g of commercially available high thermal conductivity mesophase pitch chopped fibers (the thermal conductivity at room temperature is 900W / m·K, and the aspect ratio is 1:500) and put them into a mixed solution of concentrated nitric acid and concentrated sulfuric acid in a constant temperature water bath at 60°C And after ultrasonic treatment for 5 hours, then filter and rinse with a large amount of deionized water to remove the residual mixed solution, put the treated fiber into 1000ml deionized water to stir and disperse, and set aside;

[0037] 2) After the mesophase pitch is pulverized into powder, it is sieved through 300 meshes, and 40 g of mesophase pitch powder is added to the deionized aqueous solution of high thermal conductivity mesophase pitch chopped fibers;

[0038] 3) After the mixed solution of high thermal conductivity mesophase pitch chopped fiber and mesophase pitch is subjected to high-speed ball milling and sand milling, it is taken out and ...

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Abstract

The invention relates to a preparation method for a light and high thermal conductivity carbon-based material. The light and high thermal conductivity carbon-based material in a porous structure is prepared through a series of process flows by taking carbon fiber in vapor phase growth or high thermal conductivity mesophase pitch chopped fiber as a reinforcement body and mesophase pitch as an adhesive. The light and high thermal conductivity carbon-based material is different from a conventional compact high thermal conductivity carbon / carbon composite material. The inner part of the light and high thermal conductivity carbon-based material is in the porous structure and the density is just 1 / 3-1 / 4 of that of the compact high thermal conductivity carbon / carbon composite material. The light and high thermal conductivity carbon-based material is also different from a conventional foam carbon material. On the premise of equivalent density, the compression strength of the material is much greater than that of the foam carbon material. The light and high thermal conductivity carbon-based material is expected to be widely popularized and applied in the field of thermal management, chemical energy storage, catalysis and the like.

Description

technical field [0001] The invention relates to a carbon-based material with high thermal conductivity, in particular to a method for preparing a lightweight carbon-based material with high thermal conductivity. It can be applied to battery electrodes, catalyst supports, adsorption materials, etc. Background technique [0002] With the rapid development of science and technology, heat dissipation and thermal management have become key technologies for the development of many fields. Many electronic components of aerospace vehicles need to work normally at an ambient temperature of 40-60°C. With the development of electronic technology, aircraft electronic equipment is becoming smaller, lighter, and more compact in structure. During operation, a large amount of The heat dissipation also puts forward higher and higher requirements for heat dissipation materials, which are an important part of thermal control. Large-area thin-plate structures of space vehicles such as satelli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/524C04B35/64
Inventor 冯志海樊桢孔清余立琼
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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