Thermo-mechanical Properties and Microstructures of <TEX>$ZTA-Al_2O_3$</TEX> Whisker Composites

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J. Korean Ceram. Soc. > Volume 30(6); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(6): 457.

$ZTA-Al_2O_3$ Whisker계 복합재료의 미세구조 변화에 따른 열적, 기계적 특성에 관한 연구

이문환, 최성철, 이응상

한양대학교 공과대학 무기재료공학과

Thermo-mechanical Properties and Microstructures of $ZTA-Al_2O_3$ Whisker Composites

ABSTRACT

In oxide matrix-SiC(W) composites, instability and glassy phase formation due to oxidation at the high temperature and the diffusion of Si, respectively, cause brittle fracture and low reliability for ceramic materials. The mode of contribution in each mechanisms induced by matrix-whisker debonding, varies with the morphology of matrix-whisker interfaces. This work has described the dispersion behaviours and stabilization mechanisms in slip systems, and multiple toughening mechanisms by dint of two second phase different from each other when spherical ZrO2 and chemically stable Al2O3(W) is respectively added in Al2O3 matrix. To obtain complexshaped components, slip casted bodies were sintered at 1$600^{circ}C$, 2hrs up to 98~99% R.D.. Multiple toughening mechanisms in comparison with theories reported until now will be discussed as a result of the phase analysis of ZrO2 by athermal behaviours and microstructural characterizations as well as measured mechanical properties.