MoSi_2/ZrO_2系複合焼結体の機械的性質

概要

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Two kinds of composites of MoSi_2 and ZrO_2 stabilized with 8 mol% Y_2O_3 (8Y-ZrO_2) were fabricated by sintering at 1873 K for 90 min under a vacuum of 2-8 x 10^<-3> Pa and subsequent HIPing at 1873 K for 60 min in Ar. The mechanical properties for both bodies were determined at room temperature. No new compound was produced in the MoSi_2/ZrO_2 composites by firing up to 1873 K for 90 min under a reduced pressure. Young's modulus of MoSi_2/8Y-ZrO_2 composites decreased linearly with an increase in the amount of 8Y-ZrO_2. On the other hand, Vickers hardness of the composites increased with an increase in the amount of 8Y-ZrO_2 and the effect of HIPing for sintered bodies on these values was clearly noticed. The bending strength of composites increased and then decreased with an increase in the amount of 8Y-ZrO_2. The bending strength of HIPed bodies was higher than that of as-sintered bodies over the 8Y-ZrO_2 content range of 0-60 vol%. The 8Y-ZrO_2 content dependence of fracture toughness for composites was almost the same as that of bending strength, although the amount of 8Y-ZrO_2 at which the bending strength and fracture toughness for composites take a maximum values, were different .
社団法人日本セラミックス協会の論文
1996-06-01