Si-N-O系セラミック繊維の作製と高温の機械的特性

概要

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Si-N-O ceramic fibers were prepared, at 1200-1500℃ in a stream of NH_3 gas, from polycarbosilane fibers cured by thermal oxidation at 145-180℃ in a stream of O_2 gas. The ceramic fibers were colorless and semitransparent in visible light. Their mechanical properties depended on the contents of oxygen introduced during the thermal oxidation curing process. Tensile strength of the Si-N-O ceramic fiber obtained by the heat treatment at 1400℃ of the polycarbosilane fiber cured at 160℃ was the highest among the ceramic fibers obtained in this work. The maximum tensile strength and chemical formula of the Si-N-O ceramic fiber were about 1.8 GPa and Si_<1.00>N_<1.23>O_<0.43>, respectively. The fiber was exposed at 1000-1400℃ for 1h either in air or an Ar gas in order to examine oxidation and heat resistances, respectively. Their tensile strength and Young's modulus did not change up to 1400℃ by the exposure in the Ar and 1200℃ in the air.
社団法人日本セラミックス協会の論文
1998-03-01