Improved oxidation resistance properties of Si3N4/O′-SiAlON composite ceramics by a repeated sintering method

被引：2
|
作者：
Ma, Haiqiang [1 ]
Bao, Chonggao [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2022年 / 19卷 / 05期
基金：
中国国家自然科学基金;
关键词：
oxidation resistance; Si3N4/O '-SiAlON composites; two-time sintering; weight gain; SILICON-NITRIDE; MECHANICAL-PROPERTIES; FLEXURAL STRENGTH; LIQUID-PHASE; MICROSTRUCTURE; BEHAVIOR;
D O I：
10.1111/ijac.14102
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/O'-SiAlON composite ceramics with superior oxidation resistance properties were fabricated by a repeated sintering method. The effects of sintering time on the phase evolution, microstructure, and oxidation resistance properties of the Si3N4/O'-SiAlON composite ceramics were investigated. The results indicated that the content of the O'-SiAlON phase and the densification of Si3N4/O'-SiAlON composite ceramics increased after two-time sintering. Furthermore, the thickness of the oxide layer of the Si3N4/O'-SiAlON composite ceramics after oxidation at 1100-1500 degrees C for 30 h was not significant. Compared to the oxidation weight gain after the one-time sintering process, the oxidation weight gain of Si3N4/O'-SiAlON composite ceramics was 0.432 mg/cm(2) after two-time sintering when oxidized at 1500 C for 30 h, which was reduced by 43.3%. The mechanism of the improved oxidation resistance properties was ascribed to the formation of more O'-SiAlON and the enhancement of the densification.
引用
收藏
页码：2905 / 2915
页数：11
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