Effect of Grain Size of β-Si3N4 and Glassy Phase on Strength and Fracture Toughness of In-Situ Toughened Si3N4

被引：0
|
作者：
罗学涛
机构：
[1] Department of Materials Science and Engineering Northwestern Polytechnical University
[2] P.R.China
[3] Xi’an 710012
来源：
HighTechnologyLetters | 1996年 / 02期
基金：
中国博士后科学基金;
关键词：
Si3N4; In-situ toughening; Microstructure; Strength; Fracture toughness;
D O I：
暂无
中图分类号：
TN304.9 [其他半导体材料];
学科分类号：
0805 ; 080501 ; 080502 ; 080903 ;
摘要：
An in-situ toughened Si3N4ceramic is obtained by hot-pressing.Its flexural strength andfracture toughness are 960MPa,12.74MPa·m1/2at room temperature and 720MPa,23.94MPa·m~1/2at 1350℃,respectively.The relation between grain size of β-Si3N4and mechanicalproperties is investigated.The glassy phase containing Y and La plays an important role inincreasing high-temperature mechanical properties because of its high viscosity and softeningtemperature.Crack deflection,crack branching and pullout of rodlike β-Si3N4grains are ob-served in this material by SEM,and the toughening mechanisms are discussed.
引用
收藏
页码：84 / 88
页数：5
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