高温におけるZrO2-Y2O3系の立方晶/正方晶平衡
1986 年 50 巻 1 号 p. 113-118
詳細
1986 年 50 巻 1 号 p. 113-118
In order to re-examine the the phase diagram of ZrO2-Y2O3 system, well-prepared ZrO2-Y2O3 co-precipitation powders were sintered, annealed at 1600°C (1873 K), 1700°C (1973 K) and 1800°C (2073 K), and then the conjugate compositions of tetragonal (t) and cubic (c) phase grains were analysed by means of EPMA. The present data of t-phase coincided with those by dilatometry reported in our previous paper. These data do not contradict X-ray data by Ruh et al., but it is considered that the solubility line of t-phase should be drawn in a different way from them. The anomalous shape of solubility line is discussed from the viewpoint of tetragonality and the abnormal t-c transformation of ZrO2.
