部分安定化ジルコニアの圧縮強度と相変態

概要

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The compressive strength of partially stabilized zirconia with 4-8 mol% yttria was investigated in a relatively wide range of temperature. In each yttria-added material, the amount of metastable tetragonal (T) phase decreased with increasing yttria content and this was accompanied by fracture strength decrease by decrement of the T phase. The strength also decreased with increasing test temperature in the experimental range, and the magnitude of the temperature dependence became less important with increasing yttria content. In the case of 4 mol% yttria stabilized zirconia, the fracture strain increased with temperature up to 450℃, but beyond this temperature, it decreased with increasing temperature. However, in the case of 6 or 8 mol% yttria added zirconia, the fracture strain decreased monotonically with temperature. The fracture mode in the compression test could be roughly classified into three categories in a simple map representing the relation between yttria content and test temperature. Although almost all of the stress-strain curves retained their linearity until fracture occurred, a peculiar shape of the curve exhibiting yield point and subsequent plastic deformation was observed in 4 mol% yttria stabilized zirconia tested at temperatures between 400℃ and 500℃.
社団法人日本材料学会の論文
1988-09-15