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

页码：789 / 794

页数：6

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