Gas-pressure sintering of β-silicon nitride containing Y2O3 and Nd2O3

被引：12
|
作者：
Hirosaki, Naoto
Ando, Motohide
Akimune, Yoshio
Mitomo, Mamoru
机构：
来源：
Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan | 1992年 / 100卷 / 1162期
关键词：
Doping (additives) - Firing (of materials) - Grain growth - Microstructure - Neodymium compounds - Oxides - Scanning electron microscopy - Sintering - Strength of materials - Yttrium compounds;
D O I：
10.2109/jcersj.100.826
中图分类号：
学科分类号：
摘要：
Y2O3-Nd2O3-doped β-Si3N4 was sintered at 1700°C to 1900°C for 4 h in 10 MPa N2, and the effect of the amount of the additives and sintering temperatures on strength, fracture toughness and the microstructure was investigated. A dense material (>98% of the theoretical) was obtained by firing at 1900°C with addition of 1 to 10 mol% of oxides. Rod-like β-Si3N4 grains developed by firing at 1900°C increased the fracture toughness up to 7.8 MPa √m because of the pull-out and the crack-deflection mechanism. The material made from β-Si3N4 powder had a high Weibull modulus than that from α-Si3N4 powder.
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页码：826 / 829
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