Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics

Abstract:

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The effect of sintering additives comprising AlN and RE2O3 (RE=Lu, Yb, Er and Y) in 2:3 and 3:2 molar ratios on mechanical properties of liquid-phase-sintered (LPS) and subsequently annealed SiC ceramics was investigated. The toughness vs cationic radius curve had a maximum in both 2:3 and 3:2 molar ratios; Yb-doped specimens showed maximal toughness of 5.8 and 6.6 MPa..m1/2 in 2:3 and 3:2 molar ratios, respectively. There was no correlation between room temperature (RT) strength and cationic radius. In contrast, the high temperature (HT) strength vs cationic radius curve had a minimum in both 2:3 and 3:2 molar ratios; Yb-doped specimens showed minimal strength of 520 MPa and 550 MPa in 2:3 and 3:2 molar ratios, respectively. The present results suggest that there is a trade-off in improving both RT toughness and HT strength in LPS-SiC ceramics.

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Periodical:

Edited by:

Katsutoshi Komeya, Yi-Bing Cheng, Junichi Tatami and Mamoru Mitomo

Pages:

185-188

DOI:

10.4028/www.scientific.net/KEM.403.185

Citation:

Y. W. Kim et al., "Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics", Key Engineering Materials, Vol. 403, pp. 185-188, 2009

Online since:

December 2008

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$35.00

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