☆ 4.8 Article

Fabrication of porous SiCy (core)/C (shell) fibres using a hybrid precursor of polycarbosilane and pitch

CARBON (2010)

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CARBON
卷 48, 期 7, 页码 2115-2118

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2010.01.064

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Chemistry, Physical Materials Science, Multidisciplinary

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  1. National Natural Science Foundation of China [50403010]

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Porous SiCy (core)/C (shell) composite fibres have been fabricated using a simple KOH controlled-activation of SiCx fibres, which were pyrolyzed from polycarbosilane-pitch blend fibres. Effects of activation conditions and pyrolysis temperatures were studied. There are distinctive interfaces observed on the cross-sections of the co-axial fibres, where Si content varies gradually from the core to the shell. The etching of Si follows a slow core-reducing process in N-2, while in CO2, cracks are frequently observed on the shells due to the accelerated activations. V-shaped Si-free carbon fibres could be obtained when a lower pyrolysis temperature was used to produce the SiC fibres. (C) 2010 Elsevier Ltd. All rights reserved.

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