High heat conducting foam material of graphite, and fabricating method

A technology of high thermal conductivity graphite and foam materials, which is applied in the field of manufacturing high thermal conductivity graphite foam and high thermal conductivity graphite foam, can solve the problem of no pressure release method, etc., and achieve low manufacturing cost, controllable density and porosity, and simple process Effect

Inactive Publication Date: 2006-12-06
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In 2003, Qiu Jieshan of Dalian University of Technology and others applied for a patent on the method of preparing foamed carbon by using coal tar medium-temperature pitch and petroleum pitch, but the raw materials used had to be modified with metal salts, and foamed carbon was prepared by natural cooling. press release
In 2004, Yu Mingfang of Donghua University applied for a method of preparing foamed carbon by mechanical extrusion process, but the preparation process needs to add foaming agent

Method used

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  • High heat conducting foam material of graphite, and fabricating method
  • High heat conducting foam material of graphite, and fabricating method
  • High heat conducting foam material of graphite, and fabricating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put a certain amount of petroleum mesophase pitch powder into a high-temperature and high-pressure reactor, evacuate to 0.1Mpa, heat up to 260°C at a heating rate of 4°C / min, pressurize to 6.0Mpa, and then heat up to 2°C / min The temperature is 350°C, the temperature is kept constant for 15 minutes, after cooling to room temperature, the gas is released at a constant speed to normal pressure, and the asphalt foam is obtained;

[0030] Raise the temperature of the obtained asphalt foam to 950°C at a heating rate of 1°C / min, and carry out carbonization treatment under the protection of nitrogen throughout the process to obtain carbonized asphalt foam;

[0031] Under the protection of argon, the obtained carbonized bitumen foam is heated up to 2600°C at a heating rate of 1°C / min, and cooled naturally to obtain the following figure 2 Shown high thermal conductivity graphite foam material; After measuring, the density of the high thermal conductivity graphite foam material p...

Embodiment 2

[0033] Take a certain amount of coal tar pitch powder after high-temperature heat treatment and put it into a high-temperature and high-pressure reactor, evacuate to 0.08Mpa, heat to 350°C at a heating rate of 5°C / min, pressurize to 4Mpa, and then pressurize to 1°C / min The heating rate is raised to 450°C, after constant temperature for 1 hour, while cooling to room temperature at a cooling rate of 1-2°C / min, at the same time, the gas is released at a constant speed to reduce the temperature to the softening point of the raw material (that is, 300°C) to normal pressure; to obtain bituminous foam;

[0034] The resulting asphalt foam was heated up to 1050°C at a heating rate of 1°C / min, and carbonized under the protection of nitrogen throughout the process to obtain carbonized asphaltin foam.

[0035] The obtained carbonized bitumen foam is heated up to 2800°C at a heating rate of 1°C / min under the protection of argon, and cooled naturally to obtain the following: figure 1 The h...

Embodiment 3

[0037] Take a certain amount of synthetic mesophase pitch particles and put them into a high-temperature and high-pressure reactor, evacuate to 0.08Mpa, heat up to 400°C at a heating rate of 1°C / min, pressurize to 2Mpa, and continue to heat up at a heating rate of 1°C / min to 550°C, keep the temperature constant for 2 hours, and after rapid and uniform degassing to normal pressure, cool down to room temperature at 1°C / min to obtain asphalt foam;

[0038] The obtained asphalt foam is heated up to 1100°C at a heating rate of 1°C / min, and carbonized under the protection of nitrogen throughout the process to obtain a carbonized asphalt foam.

[0039] The obtained carbonized bitumen foam is heated up to 3000°C at a rate of 1°C / min under the protection of argon, and cooled naturally to obtain the following: image 3 The high thermal conductivity graphite foam material shown; the density of the high thermal conductivity graphite foam material obtained after measurement is 0.28g / cm 3 ...

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Abstract

This invention discloses a method for manufacturing high heat-conductive graphite foam material. The method comprises: (1) heating asphalt in a reactor at 1-5 deg.C/min to 260-400 deg.C; (2) pressurizing to 2-6 MPa; (3) heating at 1-2 deg.C/min to 350-550 deg.C; (4) keeping the temperature for 15-120 min, and discharging the gas to obtain asphalt foam material; (5) heating to 950-1100 deg.C under nitrogen protection to obtain carbonized asphalt foam material; (6) heating to 2600-3000 deg.C under nitrogen protection for carbonization, and cooling naturally to obtain high heat-conductive graphite foam material. The pore sizes are 80-800 mum, the density is 0.28-0.75 g/cu cm, the porosity is 55-85%, and the heat conductivity is 68-140 W/mK. The high heat-conductive graphite foam material can be widely used in radiator, heat exchanger, automobile, airplane brake block, catalyst carrier, gas adsorbent and composite material.

Description

technical field [0001] The invention relates to a high thermal conductivity graphite foam (graphite foam) and a manufacturing method of the high thermal conductivity graphite foam. Background of the invention [0002] Charcoal foams have been used in a variety of applications including use as thermal / insulation materials, conductive fillers for polymers or plastics, electrodes and structural materials, among others. Carbon foams with large surface area and high porosity find expression in many of these and other applications. [0003] There are known various methods of making charcoal foam, including using coal or bitumen high-pressure nitriding foaming, or using raw materials such as coal, pitch, polyethylene, etc. to foam with the aid of a foaming agent, etc., and then solidifying the porous form at high temperature, in order to obtain charcoal foam. [0004] The above charcoal foam and the charcoal foam obtained by the preparation method have extremely poor thermal cond...

Claims

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Application Information

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