Effects of Mo Addition on the Microstructures and Mechanical Properties of <TEX>$Al_2O_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 25(3); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(3): 201.

Mo첨가가 $Al_2O_3$ 세라믹스의 미세구조 및 기계적 성질에 미치는 영향

박정현, 문성환, 백승수, 정동익

연세대학교 요업공학과

Effects of Mo Addition on the Microstructures and Mechanical Properties of $Al_2O_3$ Ceramics

ABSTRACT

To investigate the effects of Mo addition on the microstructures and mechanical properties of Al_2O_3$ ceramics, two kinds of Mo particles with average sizes of 2-${mu}{textrm}{m}$ and 6-${mu}{textrm}{m}$ were used as additives. It was shown that Mo particles inhibited the grain growth of Al_2O_3$, and the smaller Mo particles were more effective. In case of 2-${mu}{textrm}{m}$ Mo dispersion, the bending strength and the fracture toughness were increased. Dispersion of 6-${mu}{textrm}{m}$ MO did not increase the strength but improved the fracture toughness a little. The toughening mechanisms of Al_2O_3$-Mo composites are thought to be the crack deflection and microcracking mechanisms.