Paper Title:
Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics
  Abstract

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.

  Info
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, T. Nishimura, M. Mitomo, "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
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Young Wook Kim, Sung Hee Lee, Toshiyuki Nishimura, Mamoru Mitomo, Je Hun Lee, Doh Yeon Kim
Abstract:The effect of glassy-phase, using AlN and Lu2O3 as sintering additives, on the microstructure and mechanical properties of...
299
Authors: Tao Zhang, Hai Yun Jin, Yong Ian Wang, Zhi Hao Jin
Abstract:AlN/BN laminated ceramic composites were fabricated using tape-casting and hot-pressing by optimizing the designs of the structure and...
97
Authors: Daisuke Horikawa, Junichi Tatami, Toru Wakihara, Katsutoshi Komeya, Takeshi Meguro
Abstract:HfO2-added Si3N4 ceramics are known to exhibit excellent high-temperature strength and excellent damage characteristics because HfO2 assists...
35
Authors: Tao Zhang, Wen Zhao Li, Hai Yun Jin, Guan Jun Qiao, Zhi Hao Jin
Abstract:The AlN/Ti laminated composites were fabrication by plasma activated sintering. In the composites, the AlN layers were matrix layers and the...
348
Authors: Rosa Maria da Rocha, Francisco Cristóvão Lourenço de Melo
Abstract:The effect of three different sintering additive systems on densification of boron carbide powder was investigated. The sintering additives...
170