メカニカルアロイング法を用いた板状炭化ケイ素粒子の自己分散によるセラミックスの作製

概要

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To improve the fracture toughness of sintered bodies, a method for in-situ dispersion of SiC platelets was studied. A mechanically alloyed powder mixture consisting of Si, C, B and W (the mixing ratio was Si/C = 1/1 in molar ratio, and 3 mass% C, 3 mass% B and 5 mass% W were added as sintering additives) was sintered above 2100℃ in Ar atmosphere. By using the mechanical alloyed powder mixture, ceramics reinforced with β-SiC platelet in length of 100 μm and thickness of 5 μm, was obtained. Two possible mechanisms of the formation of a β-SiC platelet have been proposed; (a) W and B in the SiC phase are supersaturated by mechanical alloying process, (b) W-B phase is separated from the SiC phase during sintering, and then, SiC platelets grow. A W-containing compound formed in the reaction sintered SiC suppresses the phase transition from β-SiC to α-SiC.
社団法人日本セラミックス協会の論文
1997-08-01