Crack-healing and oxidation behavior of silicon nitride ceramics

被引：93
作者：
Houjou, K
Ando, K
Liu, SP
Sato, S
机构：
[1] Yokohama Natl Univ, Dept Energy & Safety Engn, Yokohama, Kanagawa, Japan
[2] Yokohama Natl Univ, Yokohama, Kanagawa 240, Japan
[3] Ching Yin Univ, Dept Mech Engn, Jhongli 32049, Taiwan
[4] NHK Spring Co Ltd, Yokohama, Kanagawa, Japan
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2004年 / 24卷 / 08期
关键词：
crack-healing; oxidation behavior; Si3N4; strength;
D O I：
10.1016/S0955-2219(03)00645-9
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：
Si3N4/SiC Composite ceramic specimens, made to JIS standard, were sintered and subjected to three-point bending. Semi-elliptical surface cracks of 50-400 mum in diameter were made on the tensile side of each specimen. Crack-healing behavior as a function of environment, temperature, time, and crack size, and oxidation behavior as a function of temperature and time were studied. The main conclusions are as follows: (1) Cracks healed completely in air, but did not heal in Ar gas, N-2 gas nor in a vacuum. (2) This Si3N4 ceramic has the ability to heal a crack at temperature from 900 to 1400 degreesC completely. (3) The maximum surface crack size that can be healed completely was 200 mum in diameter. (4) The activation energies for crack-healing and oxidation were 150 and 131KJ/mol, respectively. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2329 / 2338
页数：10
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