On the Cubic/Tetragonal Phase Equilibrium of the ZrO<SUB>2</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB> System

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  • Yoshikawa Noboru
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • Eda Hiroyuki
    Graduate Student, Tohoku University
  • Suto Hajime
    Department of Materials Science, Faculty of Engineering, Tohoku University

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Other Title
  • 高温におけるZrO<SUB>2</SUB>-Y<SUB>2</SUB>O<SUB>3</SUB>系の立方晶/正方晶平衡
  • 高温におけるZrO2-Y2O3系の立方晶/正方晶平衡
  • コウオン ニ オケル ZrO2 Y2O3ケイ ノ リッポウショウ セイ

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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.

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