1988 年 37 巻 413 号 p. 119-125
Y-PSZ materials containing 2.5 to 5.0mol% Y2O3 prepared by post hot isostatic pressing under oxygen-containing atmosphere (white-Hipping) were found to retain their original strength even after ageing at temperatures higher than 600°C for 1000h.
In this paper, the effects of heat-treatment at 1000°C to 1400°C on the bend strength and microstructure of Y-PSZ materials prepared by white-Hipping were reported.
The bend strength of 5.0mol% Y-PSZ material after heat-treating at 1100°C for 1000h increased greatly from 720 to 1080MPa. The enhancement of strength was explained by the crack-precipitate interaction (CPI) toughening mechanism.
The modulated, tweed or colony structures of fine strip crystals orthogonally crossing each other were observed within the cubic ZrO2 matrix. The 5.0mol% Y-PSZ material showed less decrease in strength at temperatures above 600°C, and higher strength at 1000°C to 1200°C than the 4.0mol% Y-PSZ material.