Tribological Properties of Hot Pressed <TEX>$SiC/Si_3N_4$</TEX> Composites

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J. Korean Ceram. Soc. > Volume 36(10); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(10): 1102.

가압소결 $SiC/Si_3N_4$ 복합체의 마찰마모특성

백용혁, 최웅, 박용갑

전남대학교 세라믹공학과. 신소재기술연구소

Tribological Properties of Hot Pressed $SiC/Si_3N_4$ Composites

ABSTRACT

SiC-Si3N4 composites were prepared by mixing $alpha$-Si3N4 powder to $alpha$-SiC powder in the range of 10 to 30 vol% with 10vol% interval. 6wg% Al2O3 and 6wt% Y2O3 were respectively added as sintering aids. Hot pressing was performed at 1,80$0^{circ}C$ for 1 hour with 25 MPa pressure. In the case of adding 20vol% of $alpha$-Si3N4 powder the relative density to theoretical value and the flexural strength were 99.1% and 34,420 MPa respectively and the worn amount was 2.09$times$10-3 mm2 which were the highest values in the all range of he composition. Although the composite containig 10 vol% of $alpha$-Si3N4 powder showed the highest fracture toughness(KIC) of 4.65MN/m3/2 the reduction of the wear resistance in this composite is likely to be affected by the homogeneity and the uniformity of the grain coalescence and growth during the sintering process.

Key words: Hot Press, Tribological Property, Silicon Carbide, Silicon Nitride