503 窒化ケイ素セラミックスの高温変形(セラミック/セラミック基複合材料1)

概要

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Silicon nitride ceramics have been investigated as a structural material. High temperature mechanical properties, in particular creep resistance, are important for high temperature use. The creep resistance has been improved by controlling chemical composition and amount of sintering additives. The sintering additives promote sintering, i.e. densification and grain growth, by forming liquid phase during heating, and then solidify during cooling as grain boundary phase. High creep resistance, 1000h creep life at 1500℃ under 137MPa of tensile stress, could be achieved by using Lu_2O_3 as the additives and reducing amount of additives up to 1.2mol%. High temperature plasticity, on the other hand, is needed for producing complex shape parts with low cost. High plastic deformability, 10^<-4> per second in strain rate at 1400℃ under compressive stress, could be obtained by reducing grain size up to<100nm.
社団法人日本機械学会の論文
2007-11-16