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J. Korean Ceram. Soc. > Volume 26(5); 1989 > Article
Journal of the Korean Ceramic Society 1989;26(5): 719.
CeO2 안정화 정방정 Zirconia 다결정체(Ce-TZP)에 관한 연구(I) : CeO2 함량에 따른 Ce-TZP의 기계적 성질과 파괴거동의 변화
김문일, 박정현1, 강대석, 문성환1
연세대학교 금속공학과
1연세대학교 요업공학과
A Study on the Ceria Stabilized Tetragonal Zirconia Polycrystals(Ce-TZP)(I) : Effect of CeO2 Content on the Mechanical Properties and Fracture Behavior of Ce-TZP
ABSTRACT
By using commercial zirconia powder CeO2-ZrO2 ceramics containing 8~16mol% CeO2 was made by heat treatment at 1350~155$0^{circ}C$ for 1~10hr. The minimum amount of CeO2 for obtaining complete tetragonal phase was 12mol%, and in the tetragonal phase region fracture toughness of Ce-TZP was decreased with increasing CeO2 content and the maximum value was obtained when 12mol% CeO2 was added. The bending strength goes through maximum at 14mol% CeO2. Fracture mode of Ce-TZP transformed from intergranular to transgranular fracture with increasing CeO2 content, so the morphology of fracture surface of 16mol% Ce-TZP was wholly transgranular and this tendency was independent on grain size. The crystal structure of the 12mol% Ce-TZP was monoclinic with fringes along the grain boundaries which are lying in the particular plane from the TEM observation. The chemical composition of the sintered body was homogeneous as a whole and some amorphism or air pocket was observed at the triple junction.
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