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Microstructure and thermal conductivity of carbon/carbon composites made with different kinds of carbon fibers

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Abstract

The microstructure and surface state of three kinds of polyacrylonitrile-based carbon fibers (T700, T300 and M40) before and after high temperature treatment were investigated. Also, the pyrocarbon and thermal conductivity of carbon/carbon composites with different carbon fibers as preform were studied. The results show that M40 carbon fiber has the largest crystallite size and the least d 002, T300 follows, and T700 the third. With the increase of heat treatment temperature, the surface state and crystal size of carbon fibers change correspondingly. M40 carbon fiber exhibits the best graphitization property, followed by T300 and then T700. The different microstructure and surface state of different carbon fibers lead to the different microstructures of pyrocarbon and then result in the different thermal conductivities of carbon/carbon composites. The carbon/carbon composite with M40 as preform has the best microstructure in pyrocarbon and the highest thermal conductivity.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy (Central South University), Changsha, 410083, China

    Jie Chen  (陈洁), Ying Long  (龙莹), Xiang Xiong  (熊翔) & Peng Xiao  (肖鹏)

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  1. Jie Chen  (陈洁)
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  2. Ying Long  (龙莹)
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  3. Xiang Xiong  (熊翔)
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  4. Peng Xiao  (肖鹏)
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Corresponding author

Correspondence to Jie Chen  (陈洁).

Additional information

Foundation item: Project(201012200233) supported by the Freedom Explore Program of Central South University, China

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Chen, J., Long, Y., Xiong, X. et al. Microstructure and thermal conductivity of carbon/carbon composites made with different kinds of carbon fibers. J. Cent. South Univ. 19, 1780–1784 (2012). https://doi.org/10.1007/s11771-012-1207-y

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  • DOI: https://doi.org/10.1007/s11771-012-1207-y

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