Sinterability and Stability of Tetragonal Zirconia Polycrystals Co-Stabilized by CeO2 and Other Oxides

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J. Korean Ceram. Soc. > Volume 28(7); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(7): 541.

CeO2와 각종 산화물에 의해 동시 안정화한 정방전 ZrO2 다결정체의 소결성과 안정성

박정현, 문성환

연세대학교 요업공학과

Sinterability and Stability of Tetragonal Zirconia Polycrystals Co-Stabilized by CeO2 and Other Oxides

ABSTRACT

Sinterability and stability of TZP ceramics co-stabilized by 12 mol% CeO2 and divalent or trivalent oxides less than 1 mol% were investigated. Divalent and trivalent oxides increased stability of tetragonal ZrO2. 100% tetragonal ZrO2 phase was obtained by doping 12 mol% CeO2 and 0.2 mol% CaO and MgO respectively when sintering was carried out at 1500$^{circ}C$ for 2 hours. Divalent and trivalent oxides improved sinterability and inhibit grain growth of ZrO2. And it was found that CaO was the most effective sintering aid and grain growth inhibitor for ZrO2 in this study. Incorporation of divalent and trivalent oxides into 12Ce-TZP increased the strength of 12Ce-TZP and particulary 12Ce, 0.4Ca-TZP exhibited a flexural strength of about twofold greater than 12Ce-TZP.