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J. Korean Ceram. Soc. > Volume 27(2); 1990 > Article
Journal of the Korean Ceramic Society 1990;27(2): 233.
CeO2 안정화 정방정 Zirconia 다결정체(Ce-TZP)에 관한 연구(IV) : 12 Ce-TZP 세라믹스에 미치는 MgO 첨가 영향
김문일, 박정현1, 강대석, 이현권1, 문성환1
연세대학교 금속공학과
1연세대학교 요업공학과
A Study on the Ceria Stabilized Tetragonal Zirconia Polycrystals (Ce-TZP) (IV) ; Effect of MgO Addition on 12 Ce-TZP Ceramics
ABSTRACT
For theinvestigation of MgO addition effect on 12Ce-TZP ceramics, MgO-CeO2-ZrO2 ceramics was fabricated using commercial powders under sintering condition of 130$0^{circ}C$-1$600^{circ}C$ for 2hr. Fully tetragonal phase could be obtained by proper heat treatment and MgO addition amount. Minor cubic phase was appeared in relatively high MgO content composition at each sintering temperature. As alloying amount of MgO increased, tetragonal stability increased and grain size decreased. Grain size dependence on MgO content was verified by SEM observation of fractured surface. Surface bloating was observed from the 2 m/o to 6m/o in the temperature range of 150$0^{circ}C$ to 1$600^{circ}C$. In spite of very porous microstructure owing to surface bloating, 100% TZP could be maintained in 2.0m/o MgO composition by heat treatment of 150$0^{circ}C$. This result indicated that MgO was more powerful stabilizer than CeO2. Mechanical proprties of MgO-CeO2-ZrO2 ceramics were consistent with the stability observation of tetragonal phase very well.
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