Method for manufacturing high heat conducting foam material of graphite with even apertures

A technology of high thermal conductivity graphite and foam materials, applied in the field of manufacturing high thermal conductivity graphite foam materials, can solve the problems of uneven surface tension, non-uniform pore size of foam carbon, affecting material strength and thermal conductivity, etc. The effect of uniformity, controllable density and porosity, and low manufacturing cost

Inactive Publication Date: 2007-10-10
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the raw material used in the above method is asphalt, the surface tension is uneven due to polymerization and decomposition at high temperature, and the pore size of the foamed carbon is not very uniform, which will affect the strength and thermal conductivity of the material.

Method used

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  • Method for manufacturing high heat conducting foam material of graphite with even apertures
  • Method for manufacturing high heat conducting foam material of graphite with even apertures
  • Method for manufacturing high heat conducting foam material of graphite with even apertures

Examples

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preparation example Construction

[0016] The preparation method of the high thermal conductivity graphite foam material of uniform aperture provided by the invention, its preparation steps are as follows:

[0017] (1) Put mesophase pitch into a high-temperature and high-pressure reactor, add surfactant and mix well, evacuate to 0.1-0.08MPa, and raise the temperature to 260-350°C at a heating rate of 1-5°C / min. Press to 2-6.0MPa, continue to heat up to 350-650°C at a heating rate of 1-5°C / min, keep the temperature for 15min-2 hours, then cool and deflate to obtain bituminous foam; the addition amount of the surfactant is 0.1%-5% of the weight of the mesophase pitch; the surfactant includes anionic, cationic or nonionic surfactants;

[0018] (2) Raise the temperature of the obtained asphalt foam to 950-1100°C at a heating rate of not more than 1°C / min, and conduct carbonization under the protection of nitrogen throughout the process to obtain a carbonized asphalt foam; then place the obtained asphalt foam carbon...

Embodiment 1

[0026] Put a certain amount of petroleum mesophase pitch powder into a high-temperature and high-pressure reactor, add 0.1% by weight of petroleum mesophase pitch powder anionic surfactant sodium dodecylbenzenesulfonate, mix well, and evacuate to 0.1MPa , heated to 260°C at a heating rate of 4°C / min, pressurized to 6.0MPa, then raised to a temperature of 650°C at a rate of 2°C / min, kept at a constant temperature for 15 minutes, cooled to room temperature, and released gas at a constant speed to normal pressure to obtain asphalt foam;

[0027] Raise the temperature of the obtained asphalt foam to 950°C at a heating rate not greater than 1°C / min, and carry out carbonization treatment under the protection of nitrogen throughout the process to obtain carbonized asphalt foam;

[0028] The resulting carbonized pitch foam is heated up to 2600°C at a heating rate not greater than 1°C / min under the protection of argon, and cooled naturally to obtain a high thermal conductivity graphite...

Embodiment 2

[0031] Get a certain amount of coal tar mesophase pitch powder and put it into a high temperature and high pressure reactor, add nonionic surfactant Span 40 of 5% by weight of coal tar mesophase pitch powder, and mix evenly, vacuumize to 0.08MPa, and Heat up to 350°C at a heating rate of 5°C / min, pressurize to 4.0MPa, then raise the temperature to 450°C at a heating rate of 1°C / min, keep the temperature for 1 hour, and cool to room temperature at a cooling rate of 1-2°C / min , let off the gas at a constant speed, lower the temperature to the softening point of the raw material (that is, complete at 300°C) to normal pressure, and obtain the asphalt foam;

[0032] Raise the temperature of the obtained asphalt foam to 1050°C at a heating rate not greater than 1°C / min, and carry out carbonization treatment under the protection of nitrogen throughout the process to obtain carbonized asphalt foam;

[0033] Under the protection of argon, the obtained carbonized pitch foam is heated to 2...

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Abstract

This invention discloses a method for preparing graphite foam material with uniform pore sizes and high heat conductivity. The method comprises: (1) placing mesophase pitch into a high-pressure reactor, adding surfactant, mixing uniformly, vacuumizing, heating to 260-350 deg.C, pressurizing to 2-6.0 MPa, heating to 450-650 deg.C, keeping for 15 min-2 h, cooling, and exhausting to obtain pitch foam; (2) heating the pitch foam at a heating rate not higher than 1 deg.C / min to 950-1100 deg.C, and carbonizing under nitrogen protection to obtain carbonized pitch foam; (3) heating the carbonized pitch foam at a heating rate not higher than 1 deg.C / min to 2500-3000 deg.C under Ar protection, and cooling naturally to obtain graphite foam material with high heat conductivity. The obtained graphite foam material can be widely used in radiators, heat exchangers, brake pads of automobiles and planes, catalyst carriers, and gas adsorbents.

Description

technical field [0001] The invention relates to a manufacturing method of a high thermal conductivity graphite foam material, in particular to a manufacturing method of a high thermal conductivity graphite foam material with uniform pore diameter. Background of the invention [0002] Foamed carbon has been used in high-tech fields, including as heat / insulation materials, conductive fillers for polymers or plastics, electrodes and structural materials, etc. Carbon foam with large specific surface area and high porosity has great potential for application in these fields. [0003] Foamed charcoal can be manufactured by using high-pressure nitriding and foaming of coal or asphalt, or using coal, asphalt, polyethylene and other raw materials with the aid of foaming agents, etc., and then solidifying the porous form at high temperature to obtain foamed charcoal. [0004] The above foamed carbon and the foamed carbon obtained by the preparation method have poor thermal conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 王永刚闵振华曹敏
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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