Polyaluminocarbosilane prepared with fillings as precursors for SiC(Al) fibers

Chin J Mater Res

2008, Vol. 22

Issue (6): 623-628 DOI:

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Polyaluminocarbosilane prepared with fillings as precursors for SiC(Al) fibers

Zhao Dafang; Li Xiaodong^†; Zheng Chunman

Key Lab of Ceramic Fiber and Composites; National University of Defense Technology; Changsha 410073

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Zhao Dafang Li Xiaodong Zheng Chunman. Polyaluminocarbosilane prepared with fillings as precursors for SiC(Al) fibers. Chin J Mater Res, 2008, 22(6): 623-628.

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Abstract

Polyaluminocarbosilane(PACS) was synthesized by a reaction between polysilacarbosilane and aluminum acetylacetonate at ambient pressure in N₂. A reactor with a high temperature pyrolysis equipment which was filled with fillings was used, so PACS can be prepared for shorter reaction time. Comparing with the PACS synthesized without fillings, its Mn increased from 1008 to 2436, its molecular distribution was narrower, and its –Si–Si– bonds content decreased. Moreover, ceramic yield of the obtained PACS at 1200℃ in N2 was increased from 65% to 69% when it was synthesized with fillings. It is suggested that the translation from –Si–Si– bonds to –Si–C– bonds was facilitated when the filling existed. The PACS is spinnability. Lower mass was gotten during air curing process. The tensile strength of the obtained Si–Al–C–O fiber is 2.1 GPa. A densified SiC(Al) fiber was obtained after been heated at 1800 ℃ in Ar.

Key words: inorganic non-metallic materials Polyaluminocarbosilane SiC fibers preceramic polymer

Received: 18 February 2008

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