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J. Korean Ceram. Soc. > Volume 31(9); 1994 > Article
Journal of the Korean Ceramic Society 1994;31(9): 1053.
마그네시아 소결체의 미세구조와 강도에 미치는 $ZrO_2$의 영향
이윤복, 이종현, 박홍채, 오기동
부산대학교 무기재료공학과
Influence of $ZrO_2$ on Microstructure and Mechanical Strength of Sintered Magnesia
ABSTRACT
The influence of ZrO2 addition on microstructre and mechanical strength of magnesia ceramics were discussed. ZrO2 was existed as a cubic phase resulted from MgO solubility into ZrO2 on firing at temperature range from 130$0^{circ}C$ to 1$600^{circ}C$ for 2 h. The addition of ZrO2 markedly promoted the densification of MgO also above 150$0^{circ}C$ and the sintered density at 1$600^{circ}C$, 2 h reached to 95.2% of the theoretical. The solubility of MgO into c-ZrO2 was about 7.68 wt% and it was segregated at grain boundary on cooling to room temperature. ZrO2 existing as a second phase retarded the grain growth of MgO. The bending strength were increased to 240 MPa with the amount of ZrO2.
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