Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (11): 1039-1043.doi: 10.3866/PKU.WHXB20031111

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The Preparation and Properties of High Temperature Resistant SiC(Al) Fibers

Li You-Ji;Cao Feng;Tian Hong-Xian;Li Xiao-Dong;Yu Yu-Xi   

  1. Department of Chemistry, Jishou University, Jishou　416000; Key Laboratory of Ceramic Fiber and Composites, National University of Defence Technology, Changsha　410073
  • Received:2003-05-06 Revised:2003-07-08 Published:2003-11-15
  • Contact: Li You-Ji E-mail:fcao@china.com

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Abstract: In order to prepare high temperature resistant SiC fibers, polyaluminocarbosilane (PACS)was synthesized by reaction of polysilacarbosilane (PSCS) with Al(AcAc)3 (AcAc: acetylacetonate). Through melting spinning of PACS, air-curing, ceramination at 1300 ℃ and sintering at 1800 ℃ SiC(Al) ceramic fibers with high temperature resistance were obtained. 29Si MAS-NMR, AES, XRD, Raman spectra and SEM suggested that the composition of SiC(Al) fibers is close to stoichiometric ratio with much lower content of oxygen, free carbon and SixCyOz phase than that of common SiC fibers resulted in a character of high temperature resistance. In addition, densification and crystalline inhabitation by aluminum are crucial to the high temperature resistance of SiC(Al) fibers.

Key words: Polyaluminumcarbosilane, High temperature resistant SiC fibers, 　Properties