Phase Stability and isothermal Phase Transformation of the Yttria-Stabilized Zirconia Powder Prepared from Alkoxide Hydrolysis

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J. Korean Ceram. Soc. > Volume 33(6); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(6): 637.

알코옥시드 가수분해법으로 합성한 이트리아 안정화 지르코니아 분말의 상안정성 및 등온상전이 특성

이종국, 김영쟁¹, 김환²

조선대학교 재료공학과
¹선문대학교 재료공학과
²서울대학교 재료공학과

Phase Stability and isothermal Phase Transformation of the Yttria-Stabilized Zirconia Powder Prepared from Alkoxide Hydrolysis

ABSTRACT

Phase stability and isothermal phase transformation during gaging at 25$0^{circ}C$ were investigated in yttria stabilized zirconia powders prepared from hydrolysis of zirconium isopropoxide. The stability of tetragonal phase at room temperature in zirconia powder was decreased with calcination temperature but increased with the addition of yttria content. During aging at 25$0^{circ}C$ in humid atmosphere isothermal phase transformation occurred in tetragonal zirconia powder stabilized by constraint effect not by alloying effect and grain size effect. Many twins and microcrackings were found in transformed monomlinic zirconia particles

Key words: Y-TZP powder, Alkoxide hydrolysis, Phase stability, Isothermal phase transformation, Stabilized effect