Effect Of Y2O3 and Yb2O3 on the microstructure and mechanical properties of silicon nitride

被引:93
作者
Lu, HH [1 ]
Huang, JL [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan
关键词
microstructure; mechanical properties; silicon nitride; sintering additives;
D O I
10.1016/S0272-8842(01)00008-6
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The effect Of Y2O3 and Yb2O3 on the microstructure and mechanical properties of silicon nitride was investigated. The effect of heat-treatment on the crystallization of grain boundary phases and on the high-temperature strength was also studied. Sinterability and alpha to beta phase transformation of silicon nitride with Y2O3 were more pronounced than that with Yb2O3, for the same additive content. A wider grain size distribution and a larger average grain size were observed in the specimens with Y2O3. The specimens with Yb2O3 showed higher flexure strength, hardness and fracture toughness owing to a more frequent pullout of grains. Strength retention of silicon nitride at elevated temperatures was attributed to the crystallization and refractoriness of the grain boundary phases. (C) 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码:621 / 628
页数:8
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