Preparation method of C/C-SiC composite material with high thermal conductivity

A composite material and prefabricated technology, applied in the field of preparation of C/C-SiC composite materials, can solve the problems of reduced mechanical properties and thermal conductivity of final composite materials, poor weaving process performance, thermal mismatch, etc., to achieve volume reduction Shrinkage, optimized thermal conductivity, and reduced thermal mismatch effects

Active Publication Date: 2020-12-22
湖南东映碳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilizing SiC to modify C/C composites is one of the main thermal protection means of traditional polyacrylonitrile-based C/C-SiC composites; in contrast, the preparation of high thermal conductivity C/C-SiC composites requires a special structure During the design and preparation process, the main surface is in the following aspects: First, the modulus of the high thermal conductivity mesophase pitch-based carbon fiber is much higher than that of the PAN-based carbon fiber, usually abov

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First, mesophase pitch carbon fibers were carbonized at 500°C to obtain low-temperature filaments of mesophase pitch carbon fibers, namely carbon fibers I. The low-temperature filaments of carbon fibers I had a strength of 0.30 GPa and a modulus of 8 GPa. Carry out high-temperature carbonization treatment at 1000°C to the carbon fiber I, adjust the modulus of the carbon fiber to 100GPa and the strength to 1.05GPa, and obtain the carbon fiber II. After weaving the above-mentioned carbon fiber II into three pieces of satin weave cloth, use T800 carbon fiber in the Z direction to finely weave and puncture the above-mentioned carbon cloth to obtain a three-dimensional prefabricated body. The content of PAN-based carbon fiber in the Z direction of the carbon fiber prefabricated body is 8vol%. The content of mesophase pitch-based carbon fibers in the X and Y directions is 18 vol%.

[0063] Secondly, the three-dimensional preform is placed in a graphitization furnace, and the ...

Embodiment 2

[0066] First, mesophase pitch carbon fibers were carbonized at 600°C to obtain low-temperature filaments of mesophase pitch carbon fibers, namely carbon fibers I. The low-temperature filaments of carbon fibers I had a strength of 0.35 GPa and a modulus of 38 GPa. Carry out high-temperature carbonization treatment at 1600°C to the carbon fiber I, adjust the modulus of the carbon fiber to 210GPa and the strength to 1.6GPa, and obtain the carbon fiber II. After weaving the above-mentioned carbon fiber II into eight pieces of satin weave cloth, use M40J carbon fiber in the Z direction to finely weave and puncture the above-mentioned carbon cloth to obtain a three-dimensional prefabricated body. The content of the PAN-based carbon fiber in the Z direction of the carbon fiber prefabricated body is 6vol%. The content of mesophase pitch-based carbon fibers in the X and Y directions is 20 vol%.

[0067] Secondly, the three-dimensional prefabricated body was placed in a graphitization f...

Embodiment 3

[0070]First, mesophase pitch carbon fibers were carbonized at 700°C to obtain low-temperature filaments of mesophase pitch carbon fibers, namely carbon fibers I. The low-temperature filaments of carbon fibers I had a strength of 0.45 GPa and a modulus of 50 GPa. Carry out high-temperature carbonization treatment on carbon fiber I at 1800°C, adjust the modulus of carbon fiber to 290GPa and strength to 1.9GPa, and obtain carbon fiber II. After weaving the above carbon fiber II into five pieces of satin weave cloth, use T800 carbon fiber in the Z direction to finely weave and puncture the above carbon cloth to obtain a three-dimensional prefabricated body. The content of PAN-based carbon fiber in the Z direction of the carbon fiber prefabricated body is 7vol%. The content of mesophase pitch-based carbon fibers in the X and Y directions is 19 vol%.

[0071] Secondly, the three-dimensional prefabricated body was placed in a graphitization furnace, and the temperature was raised to ...

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Abstract

The invention provides a preparation method of a high-thermal-conductivity C/C-SiC composite material, which comprises the following steps: carbonizing mesophase pitch carbon fibers by using a two-stage carbonization method, weaving the carbonized mesophase pitch carbon fibers into carbon cloth, and puncturing the carbon cloth in the Z direction by using PAN-based carbon fibers by using a fine weaving puncture method to obtain a three-dimensional prefabricated body; and after the three-dimensional prefabricated body is subjected to graphitization treatment, densifying the three-dimensional prefabricated body through a pyrolytic carbon method, then subjecting the three-dimensional prefabricated body to graphitization, and densifying the three-dimensional prefabricated body through a chemical vapor reaction method, so as to obtain the three-dimensional high-thermal-conductivity C/C-SiC composite material.

Description

technical field [0001] The invention belongs to the technical field of structure-function integrated composite materials. In particular, it relates to a preparation method of a C / C-SiC composite material with high thermal conductivity and oxidation resistance. Background technique [0002] High thermal conductivity C / C composites are prepared from mesophase pitch-based carbon fibers as reinforcements. Compared with traditional C / C composites prepared from polyacrylonitrile-based carbon fibers, they have excellent high-temperature mechanical properties, light weight and high strength. In addition, it also has good thermal conductivity and is a new type of composite material with integrated structure and function, which can be widely used in aerospace, nuclear energy industry and some civil industries. At present, the application environment of high thermal conductivity C / C composite materials is mostly high temperature environment and aerobic environment. Due to the limitati...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/565C04B35/622
CPCC04B35/83C04B35/565C04B35/622
Inventor 黄东叶崇刘金水刘玲樊桢朱世鹏张鹏
Owner 湖南东映碳材料科技有限公司
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