Preparation method for light and 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 decreased thermal conductivity, high thermal expansion coefficient, high density, etc., to achieve the effect of improving specific thermal conductivity, easy graphitization, and reducing density

Active Publication Date: 2015-09-02
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 light-weight thermally conductive carbon-based material of the present invention comprises the following steps:

[0022] Step 1: Put the reinforcing body into a strong oxidizing solution for ultrasonic treatment, filter and wash with a large amount of deionized water after the treatment to remove the residual strong oxidizing solution; the reinforcing body is 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 it 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 pitc...

Embodiment 1

[0028] 1) 50g of commercial vapor-grown carbon fibers (thermal conductivity at room temperature greater than 1000W / m K, aspect ratio greater than 1:1000) were taken out and placed in a concentrated nitric acid solution at a constant temperature of 60°C in a water bath and ultrasonically treated for 5h, then filtered and used Rinse with a large amount of deionized water to remove the residual nitric acid solution, put the treated fibers into 500ml of ethanol solution, stir and disperse, and set aside;

[0029] 2) After crushing the mesophase pitch into powder, sieve with 300 meshes, and add 20g of mesophase pitch powder to the ethanol solution of the vapor-grown carbon fiber;

[0030] 3) After carrying out high-speed ball milling and sanding treatment of the mixed solution of vapor-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) carrying out su...

Embodiment 2

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

[0037] 2) After crushing the mesophase pitch into powder, sieve with 300 meshes, and add 40g of mesophase pitch powder 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 fibers and mesophase pitch is subjected to high-speed ball milling and sanding treatment, take it out and pour it into a container, ad...

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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 light-weight high-thermal-conductivity carbon-based material, belongs to the technical field of carbon material manufacturing, and can be applied to thermal management and thermal dredging of aerospace vehicles, electronic instruments and equipment, etc. It can be applied to battery electrodes, catalyst carriers, adsorbent 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 to 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 Therefore, higher and hig...

Claims

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Application Information

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Patent Type & Authority Applications(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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