Oxidation behavior of high thermal conductivity mesophase-pitch-based carbon fibers

被引：0
|
作者：
Wang H. [1 ,3 ]
Wang G. [3 ]
Zhou X. [4 ]
Fan Z. [4 ]
Wu H. [3 ]
Ye C. [2 ,3 ]
Zhang Y. [2 ,3 ]
Huang D. [1 ,2 ,3 ]
机构：
[1] Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou
[2] Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials, Hunan Toyi Carbon Material Technology Co., Ltd., Changsha
[3] College of Materials Science and Engineering, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha
[4] Aerospace Research Institute of Materials and Processing Technology, Beijing
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 09期
基金：
中国国家自然科学基金;
关键词：
C/C composites; high thermal conductivity; mesophase-pitch-based carbon fibers; microstructure; oxidation behavior;
D O I：
10.13801/j.cnki.fhclxb.20221117.002
中图分类号：
学科分类号：
摘要：
The oxidation behaviors of the homemade high thermal conductive mesophase-pitch-based carbon fiber (CFMP) at different time and temperature were investigated using the polyacrylonitrile-based carbon fiber (M55J) as the control group. The results show that CFMP exhibits a fold radiation structure in the outer part and onion skin structure in the inner part. The CFMP has a well-developed graphite crystallite and a high degree of orientation. Oxygen atoms preferentially diffuse in the microcracks and micropores in the fold radiation carbon textures of CFMP and react with them resulting in radial cracks and localized pits. In the low temperature oxidation stage, the oxidation behaviors of the fibers are controlled by the carbon-oxygen chemical reaction. Because the active site concentration in graphite crystallite of CFMP is lower, its initial reaction temperature is higher than that of M55J, and its oxidation mass loss rate is relative lower. In the high temperature oxidation stage, the oxidation behaviors of the fibers are controlled by oxygen diffusion. The oxidation mass loss rate of CFMP is higher than that of M55J because there are more oxygen diffusion paths in the CFMP. Moreover, because there are more and larger microstructural defects in CFMP after oxidation, the strength retention rate of the CFMP is only 78%, which is lower than that of M55J (85%). This study provides certain technical and theoretical references for the structural design and actual service of high thermal conductive C/C composites. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：5189 / 5200
页数：11
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