Microstructure and strength of oxidation-bonded porous silicon nitride ceramics

被引：1
|
作者：
Ding, Shuqiang [1 ]
Zeng, Yuping [1 ]
Jiang, Dongliang [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
来源：
PROGRESSES IN FRACTURE AND STRENGTH OF MATERIALS AND STRUCTURES, 1-4 | 2007年 / 353-358卷
关键词：
Si3N4; SiO2; porous ceramics; microstructure; strength;
D O I：
10.4028/www.scientific.net/KEM.353-358.503
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An oxidation bonding process was developed to fabricate oxidation-bonded porous silicon nitride (Si3N4) ceramics from alpha-Si3N4 powder in air at 1100-1400 degrees C. Si3N4 particles are bonded by the oxidation-derived silica (SiO2) and the pores derive from the stack of Si3N4 particles and the release of N-2 and SiO gas during the sintering. The microstructure of oxidation-bonded porous Si3N4 ceramics was observed. Moreover, the fracture mechanism was analyzed. Effects of the bonding phases and pores on the flexural strength were investigated. Oxidation-bonded porous Si3N4 ceramics with high flexural strength was obtained by restraining the crystallization of amorphous silica and forming the well-developed necks between Si3N4 particles.
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页码：503 / 506
页数：4
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