Microstructure and Mechanical Properties of <TEX>$Al_2$</TEX>O<TEX>$_3$</TEX>/t-ZrO<TEX>$_2$</TEX> Particulate Composites

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J. Korean Ceram. Soc. > Volume 36(7); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(7): 734.

Al$_2$O$_3$/t-ZrO$_2$ 입자복합체의 미세구조 및 기계적 성질

심동훈, 이윤복¹, 김영우², 오기동¹, 박홍채¹

LG화학
¹부산대학교 생산기술연구소(재료공학부)
²포항산업과학기술연구소

Microstructure and Mechanical Properties of $Al_2$O$_3$/t-ZrO$_2$ Particulate Composites

ABSTRACT

Al2O3/t-ZrO2 particulate composites were prepared by sintering at 150$0^{circ}C$ and 1$600^{circ}C$ for 2h in air and microstructure and mechanical properties of the composites were investigated. Although most ZrO2 particles existed at Al2O3 grain boundaries a few ZrO2 particles within Al2O3 grains. Al2O3 grain growth was depressed due to the pinning effect by ZrO2 particles. During sintering coarsening of intergranular ZrO2 particles occurred as a results of the elimination of ZrO2 intraagglomerate grain boundaries and the coalescence of dragged ZrO2 particles by migrating Al2O3 grain boundries. Changes in mechanical properties of Al2O3 composites were dependant on microstructure of Al2O3 matrix and on size and structure of dispersed ZrO2

Key words: Particulate composites, Microstructure, Mechanical propertis, ZrO$_2$ intraagglomerate grain boundaries, Coalesence, Al$_2$O$_3$ grain boundaries