A Study on the Ceria Stabilized Tetragonal Zirconia Polycrystals(Ce-TZP)(III) : Effect of Al2O3 Addition on the Mechanical Properities and Microstructures of Ce-TZP

,; ,; ,; ,; ,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 27(1); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(1): 55.

CeO2안정화 정방정 Zirconia 다결정체(Ce-TZP)에 관한 연구(III) : Ce-TZP의 기계적성질 및 미세조직에 미치는 Al2O3첨가의 영향

김문일, 박정현¹, 강대석, 문성환¹, 안계원²

연세대학교 금속공학과
¹연세대학교 요업공학과
²한국 뉴세라믹스 연구소

A Study on the Ceria Stabilized Tetragonal Zirconia Polycrystals(Ce-TZP)(III) : Effect of Al2O3 Addition on the Mechanical Properities and Microstructures of Ce-TZP

ABSTRACT

Effect of Al2O3 addition on the mechanical properties and microstructure of Ce-TZP were studied. 12, 14, 16Ce-TZP containing 0-40wt% Al2O3 were prepared by sintering at 155$0^{circ}C$ for 2h. in air. Density, linear shrinkage, bending strength, Vickers hardness, microstructuer and the amount of stress induced phase transformation were examined. Vickers hardness increased linearly with increasing amounts of Al2O3. The amount of transformation and fracture toughness decreased linearly with increasing amount of Al2O3. Linear shrinkage and relative density decreased with increasing Al2O3 content in all composition of Ce-TZP. Grain growth of Ce-TZP was inhibited by Al2O3 dispersion and fracture mode of Ce-TZP/Al2O3 composites transformed from intergranular to transgranular fracture as the amount of Al2O3 increased. TEM observation revealed that Al2O3 particles were located mainly at grain boundaries of ZrO2.