High aspect ratio β-Si3N4 grain growth

被引：28
作者：
Perera, DS [1 ]
Mitchell, DRG [1 ]
Leung, S [1 ]
机构：
[1] Australian Nucl Sci & Technol Org, Div Mat, Menai, NSW 2234, Australia
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2000年 / 20卷 / 06期
关键词：
aspect ratio; grain growth; microstructure-final; Si3N4;
D O I：
10.1016/S0955-2219(99)00201-0
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：
It has been shown by others that high aspect ratio beta-Si3N4 grains formed in-situ on sintering lead to high fracture toughness in Si3N4 ceramics. In this work beta-Si3N4 powder was sintered at 1750 degrees C for varying times with Y2O3, La2O3, SiO2, and CaO additives. The microstructure of the materials was examined by electron microscopy and microanalysis. The beta-Si3N4 grain growth rate was controlled by diffusion through the liquid phase. A maximum aspect ratio of about 20 was observed for beta-Si3N4 grains heated for 6 h and was dependent on the chemistry of the liquid phase present. The formation of high aspect ratio Si3N4 at a relatively low temperature and short sintering times is discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：789 / 794
页数：6
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