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Method for preparing high hear conduction intermediate phase asphalt base charcoal materials

A mesophase pitch, high thermal conductivity technology, applied in the direction of fibrous fillers, textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of reducing material thermal conductivity, low thermal conductivity, complex process, etc., to avoid interference, high thermal conductivity The effect of high efficiency and simple process

Active Publication Date: 2007-05-30
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

In addition, the process flow is mesophase pitch melt spinning, non-melting, carbonization, graphitization, and then lamination and resin or other matrix composite materials, the process is more complicated; moreover, when the fiber is composited with other matrix, the matrix will be The axial orientation of the mesophase fibers has an effect; in addition, the lower thermal conductivity of the matrix will also reduce the overall thermal conductivity of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the mesophase pitch is refined, it is melt-spun, and the cross-section of the micropores of the spinneret is rectangular. Put the spun mesophase pitch ribbon fibers into a batch-type glass tube non-melting furnace for non-melting: the oxidizing medium used is air, which is passed into the heating furnace, and then enters the non-melting furnace for non-melting treatment of the fibers; non-melting The heating rate is 5°C / min within 0~150°C, 0.5°C / min between 150°C and 280°C, and the temperature is kept constant for 2 hours. The non-melting tape-shaped fiber layup is then heat molded. Molding temperature is 300°C, pressure is 80MPa, and molded. Finally, carbonize (900°C, stay for 60 minutes) and graphitize (2600°C, stay for 20 minutes) on the molded material. At this time, the thermal conductivity of the obtained material is 336W / (m·K), and the density is 1.50g / cm 3 . The thermal conductivity is measured according to the relative comparison method of GB-3399-...

Embodiment 2

[0022] Take the non-melting mesophase pitch-based fibers with strip-shaped cross-sections prepared in Example 1, and mold them at 300°C and a pressure of 30 MPa after laying. Then carbonization and graphitization are carried out to the molding material under the carbonization and graphitization conditions in Example 1. The resulting material has a thermal conductivity of 256W / (m K) and a density of 1.46g / cm 3 .

Embodiment 3

[0024] The mesophase pitch-based fiber with ribbon-shaped cross-section spun in Example 1 was subjected to non-melting treatment. The heating system is 1°C / min within 0~150°C, 0.5°C / min between 150°C and 260°C, and constant temperature for 2 hours. The fiber is laminated and molded at 80MPa and 300°C. The material is then carbonized and graphitized under the carbonization and graphitization conditions in Example 1. The resulting material has a thermal conductivity of 398W / (m K) and a density of 1.66g / cm 3 .

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Abstract

A method for preparing high heat conducting interphase bitumen material, uses band-shaped interphase bitumen fiber which is not melton in 180-280deg.C, with the speed to increase temperature being 0-150deg.c im 1-5deg.C / min, 150deg.C the final temperature being 0.2-0.6deg.C / min, and be dept in the final temperature for 1-3h, then be stamped to form the product in the pressure of 20-100MPa and temperature of 200-300deg.C, through charring and graphitization to generate the high heat conducting material. The invention has simple technique, avoids interference of filler or sticker and can be made into high heat conducting carbon material directly.

Description

technical field [0001] The invention belongs to a method for preparing a carbon material, in particular to a method for preparing a high thermal conductivity mesophase pitch-based carbon material. Background technique [0002] High-power-density devices of spacecraft, high-power-density electronic instruments and large-scale computers all require the use of heat sinks made of high thermal conductivity materials, while materials with good thermal conductivity such as copper and silver are not suitable for the above-mentioned applications due to their shortcomings such as high density and high expansion coefficient. occasion use. Carbon materials have become one of the hot spots in the development of high thermal conductivity materials since the mid-1990s because of their excellent properties such as low density, high thermal conductivity, low expansion coefficient, high temperature and high strength. The degree of orientation of graphite crystals along the fiber axis is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/44D01F9/145
Inventor 刘朗马兆昆史景利郭全贵翟更太宋进仁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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