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Method for preparing high heat conducting foam carbon material

A technology of foamed carbon and high thermal conductivity, which is applied in the field of preparation of foamed carbon materials, can solve the problems of reduced thermal conductivity of foamed carbon, achieve the effects of increasing size, good thermal conductivity and mechanical properties, and simplifying the preparation process

Active Publication Date: 2008-04-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thermal barrier effect caused by the addition of montmorillonite, the thermal conductivity of carbon foam after graphitization also decreases to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The foamed carbon was prepared by using naphthalene-based mesophase pitch as raw material. The softening point of the mesophase pitch used was 282°C, and it was ground and passed through a 100 mesh sieve for use. Polyoxyethylene and distilled water were mixed at a ratio of 1 g: 150 ml, and stirred with a magnetic stirrer for 10 hours to fully dissolve the polyoxyethylene in distilled water to obtain a dispersant. Mix the mesophase pitch and Ti powder with a mass percentage of 95:5, pour it into the dispersant, and ball mill it in a liquid nitrogen ball mill for 2 hours to achieve the uniform mixing of the doped particles in the mesophase pitch, and then mix the mixed material in the The oven was kept at 100°C for 2 hours. Weigh 20 grams of the above-mentioned mixed material, put it in a stainless steel mold, place it in an autoclave, and repeatedly charge and discharge nitrogen three times under a pressure of 1 MPa to exhaust the air in the autoclave, start the temperat...

Embodiment 2

[0020] The foamed carbon was prepared by using naphthalene-based mesophase pitch as raw material. The softening point of the mesophase pitch used was 282°C, and it was ground and passed through a 100 mesh sieve for use. Polyoxyethylene and distilled water were mixed at a ratio of 1 g: 170 ml, and stirred with a magnetic stirrer for 7 hours to fully dissolve the polyoxyethylene in distilled water to obtain a dispersant. Mix the mesophase pitch and Ti powder with a mass percentage of 93:7, pour it into the dispersant, and ball mill it in a liquid nitrogen ball mill for 1 hour, so that the doped particles are uniformly mixed in the mesophase pitch, and then the mixed material is placed in the The oven was kept at 120°C for 1 hour. Weigh 20 grams of the above-mentioned mixed material, put it in a stainless steel mold, place it in an autoclave, and repeatedly charge and discharge nitrogen three times under a pressure of 1 MPa to exhaust the air in the autoclave, start the temperatu...

Embodiment 3

[0023] The foamed carbon was prepared by using naphthalene-based mesophase pitch as raw material. The softening point of the mesophase pitch used was 282°C, and it was ground and passed through a 100 mesh sieve for use. Polyethylene oxide and distilled water were mixed at a ratio of 1 g: 200 ml, and stirred with a magnetic stirrer for 4 hours to fully dissolve the polyoxyethylene in distilled water to obtain a dispersant. Mix the mesophase pitch and Ti powder with a mass percentage of 89:11, pour it into the dispersant, and ball mill it in a liquid nitrogen ball mill for 1 hour, so that the doped particles are evenly mixed in the mesophase pitch, and then the mixed material is placed in the The oven was kept at 120°C for 1 hour. Weigh 20 grams of the above-mentioned mixed material, put it in a stainless steel mold, place it in an autoclave, repeatedly charge and discharge nitrogen three times under a pressure of 1 MPa to exhaust the air in the autoclave, and start the temperat...

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Abstract

This invention relates to a method for preparing high-thermal conductivity foamy carbon material. In this invention, polyoxyethylene, polyvinyl alcohol or polymethylcellulose and distilled water are mixed to obtain the dispersing agent; asphaltum, as the intermediate phase, is added with adulterant particle Ti and mixed; the mixture is then added into said dispersing agent, after ball-milling, drying to obtain doped intermediate phase asphaltum. After that, the same is heated, in protective nitrogen atmosphere, at 450-500deg.C for 2-3hrs, after cooling to obtain asphaltum foam. Then it is heated, under nitrogen protective atmosphere, to 800-1000deg.C, for 1-2hrs, after cooled to room temperature to obtain foamy carbon. Finally, the same is heated to 2500-2800deg.C, under argon atmosphere, for 10-20min, cooled to room temperature to obtain graphite foamy carbon. The advantages of this invention are: simple process, low cost, and high-thermal conductivity.

Description

technical field [0001] The invention relates to a preparation method of a foamed carbon material with low density and high thermal conductivity. Background technique [0002] Mesophase pitch-based carbon foam is a member of the family of carbon materials that have emerged in recent years. Its unique properties have attracted the attention of researchers at home and abroad. It is composed of cells in the middle and graphite structures regularly arranged around it. A porous lightweight carbon material with a three-dimensional network structure of interconnected cells. Because the mesophase pitch-based foamed carbon has excellent properties incomparable to other materials such as light weight, high temperature resistance, corrosion resistance, thermal shock resistance, and small thermal expansion coefficient, especially isotropic thermal conductivity, it has great potential in many fields. High application value. For example, in the fields of heat exchanger equipment and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 闫曦史景利宋燕郭全贵宋进仁刘朗
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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