Mechanical and Tribological Properties of <TEX>$alpha$</TEX>-Sialon/SiC Whisker Composites

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J. Korean Ceram. Soc. > Volume 30(10); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(10): 785.

$alpha$-Sialon/SiC Whisker 복합재료의 기계적 물성 및 마모 특성 연구

이병하, 김인섭, 이경희

명지대학교 공과대학 무기재료공학과

Mechanical and Tribological Properties of $alpha$-Sialon/SiC Whisker Composites

ABSTRACT

Sialon ceramics are presently seen as promising materials with high hardness, strength, fracture toughness and corrosion resistance for friction and wear applications. The objective of present work is to improve of mechanical properties and wear resistance of $alpha$-Sialon(x=0.4) by addition of SiC whisker. $alpha$-sialon(x=0.4)/SiC whisker composites were obtained by hot-isostatic pressing at 173$0^{circ}C$ for 1 hour under 1757Kg/$textrm{cm}^2$ N2 pressure after pressureless sintering the mixture of Si3N4, Y2O3, AlN at 1780~180$0^{circ}C$ for 3~5 hours in N2 atmosphere. As the amount of SiC whisker content increased, relative density and hardness were decreased, however fracture toughness, bending strength and tribological properties were improved. Tribological properties of $alpha$-Sialon/15 vol% SiC whisker composite were improved in spite of its low mechanical properties.