B_4CとTiCの反応焼結により作製されたB_4C/TiB_2複合体の微細構造

概要

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TiB_2 dispersed B_4C ceramics were fabricated by reac tion sintering of B_4C and TiC powders. The microstruc ture of this counposite was observed mainly by trans mission electron rricroscopy. TiB_2 particles dispersed uniformly in the boundaries of B_4C matrix. The inter faces of B_4C B_4C, TiB_2 TiB_2 and B_4C TiB_2 connect directly without intergranular phase, defect and im purity, and have no preferred orientation. However, "ribbon like structure " carbon layer sometimes precipi tates at B_4C B_4C, TiB_2 TiB_2 and B_4C TiB_2 interfaces, which form in parallel to (002) plane of carbon. The degradation of bending strength and the constant frac ture toughness observed in the composites containing more than 20 vol% TiC in starting material are caused by the increase of carbon precipitation.
社団法人日本セラミックス協会の論文
1994-04-01