熱硬化性ポリシラスチレン-ペルヒドロポリシラザン共重合体の合成と熱分解

概要

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Copolymer of polysilastyrene and perhydropolysilazane was obtained by the reaction of polysilastyrene with zirconium n-butoxide and perhydropolysilazane. Zirconium n-butoxide and perhydropolysilazane were essential to render the thermosetting property. The thermosetting copolymers were converted into silicon carbide-based ceramics by pyrolysis at 1000℃ in a stream of N_2 with about 80 mass% ceramic yield. The main phase of the pyrolysis product at 1500℃ in N_2 was small crystallite β-SiC. Free carbon, based on rule-of-mixtures composition in the final ceramics could be reduced by varying the ratio of polysilastyrene/prehydropolysilazane. The copolymer was dry spun and pyrolyzed to produce a ceramic fiber. Pyrolysis in N_2 at 1500℃ yielded a silicon carbide-based fiber. Tensile strength of 1.0 GPa and elastic modulus of 190 GPa were obtained for the fiber from 10 to 12 μm in diameter. Crystallization to α-Si_3N_4, β-Si_3N_4, β-SiC, and ZrN proceeded on annealing in N_2 at 1700℃ for 1 h.
社団法人日本セラミックス協会の論文
1995-05-01