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Preparation method of unidirectional carbon/carbon composite material with high heat conductivity

A technology of carbon composite materials and high thermal conductivity, which is applied in the field of preparation of carbon/carbon composite materials. It can solve problems such as difficulty in making large-scale samples, high shrinkage and weight loss rates, and harsh preparation conditions, and achieve excellent mechanical properties and densification. The effect of high degree and simple preparation process

Active Publication Date: 2014-07-23
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 relatively large shrinkage and weight loss rate of moderately oxidized fibers or low-temperature carbonized large-section ribbon-shaped carbon fibers during high-temperature heat treatment, the preparation conditions of the above two technologies are harsh, and the yield is low, making it difficult to produce large-scale samples. There is still a long way to go to promote the application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put the mesophase pitch into an aqueous solution containing 5% methylcellulose (the mass ratio of pitch to water is 1:10), stir at high speed for 2 hours, and obtain a uniform dispersion; put a 700mm mesophase pitch-based circular section (average 10.5μm in diameter) fixed filaments of carbon fibers are arranged in parallel on a flat plate with a thickness of 0.5mm, and then the prepared asphalt dispersion is evenly coated on the surface of the fibers. The mass ratio of carbon fibers to asphalt in the dispersion is 1:1.03, Dry naturally to obtain a fiber prefabricated body. The mass ratio of fiber and pitch in the prefabricated body is tested to be 1:1; the prefabricated body is cut into 100×100mm thin slices, and the stacks are placed in a mold in turn, heated and pressurized to form, The pressure is 20MPa, the temperature is 1000°C, the constant temperature and pressure are 10min, and the composite carbon product is prepared; the carbon product is impregnated and densi...

Embodiment 2

[0036]Put the asphalt into an aqueous solution containing 1% hydroxyethyl cellulose (the mass ratio of asphalt to water is 1:12), stir at high speed for 3 hours to obtain a uniform dispersion; put a 600mm mesophase asphalt-based circular section (average diameter 12.6μm) fixed filaments of carbon fibers are arranged in parallel on a flat plate with a thickness of 0.3mm, and then the prepared asphalt dispersion is evenly coated on the surface of the fibers. The mass ratio of carbon fibers to asphalt in the dispersion is 1:0.82. After drying, the fiber prefabricated body was obtained. The mass ratio of fiber and pitch in the prefabricated body was tested to be 1:0.8; the prefabricated body was cut into 210×100mm thin slices, and the stacks were placed in the abrasive mold in turn, heated and pressurized, and the pressure 20MPa, temperature 1300°C, constant temperature and constant pressure for 30 minutes to prepare composite carbon products; use mesophase pitch with a softening p...

Embodiment 3

[0038] Put the mesophase pitch into an aqueous solution containing 0.5wt% of anionic surfactant HY-200 (the mass ratio of pitch to water is 1:13), and stir at high speed for 5 hours to obtain a uniform dispersion; put 500mm of mesophase Pitch carbon fiber circular cross-section (average diameter 14.6μm) fixed filaments are arranged in parallel on a flat plate with a thickness of 0.1mm, and then the prepared pitch dispersion is evenly coated on the surface of the fiber, the mass of the carbon fiber and the pitch in the dispersion The ratio is 1:0.61, and it is dried naturally to obtain a fiber prefabricated body. The mass ratio of fiber and pitch in the prefabricated body is tested to be 1:0.6; the prefabricated body is cut into 100×100mm thin slices, and the stacks are placed in the abrasive tool in turn , heated and pressurized, the pressure is 25MPa, the temperature is 1500°C, and the constant temperature and pressure are 60min, and the composite carbon product is obtained; t...

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Abstract

The invention discloses a preparation method of a unidirectional carbon / carbon composite material with high heat conductivity. The preparation method comprises the following steps: preparing a pitch dispersion liquid from mesophase pitch; evenly applying the pitch dispersion liquid onto the surfaces of fixed-length mesophase-pitch-based carbon fibers, or soaking continuous mesophase-pitch-based carbon fibers in the pitch dispersion liquid; naturally airing or drying the fibers to obtain a one-dimensional carbon-carbon composite material preform; performing compression molding on the one-dimensional preform, i.e., performing hot compression molding and once soaking for pitch densification; and then performing hot repressing for graphitization. The preparation method has the advantages of simple preparation technology, easily-controlled operation parameters, good repeatability and short production cycle, large-sized products can be obtained, and the method is suitable for large-scaled production.

Description

technical field [0001] The invention belongs to a method for preparing a carbon / carbon composite material, in particular to a method for preparing a carbon / carbon composite material with high thermal conductivity in one dimension. Background technique [0002] With the development of science and technology, structure-function integrated heat dissipation materials are becoming more and more important in aerospace, nuclear industry, military industry and other fields. Parts such as the nose cones of missiles and aerospace vehicles, solid rocket motor nozzles, and nuclear fusion first wall materials need to work in complex and harsh environments, and must withstand high temperature or high heat flux density and large temperature differences between cold and hot environments. This requires materials to have high mechanical properties and excellent thermal conductivity to facilitate heat energy exchange with the outside world, and to control their own temperature changes to adapt...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 高晓晴郭全贵翟更太
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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