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

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• 作者：Zengyong Chu ; Rongan He ; Xiaobin Zhang ; Zheng Jiang ; Haifeng Cheng ; Yingde Wang ; Xiaodong Li
• 刊名：Carbon
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：48
• 期：7
• 页码：2115-2118
• 全文大小：234 K

文摘

Porous SiC_y (core)/C (shell) composite fibres have been fabricated using a simple KOH controlled-activation of SiC_x 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 N₂, 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_x fibres.