Porous Si3N4/SiC Ceramics Prepared via Nitridation of Si Powder with SiC Addition

被引：9

作者：

Hu, Hai-Long ^{[1
,2
]}

Yao, Dong-Xu ^{[1
]}

Xia, Yong-Feng ^{[1
]}

Zuo, Kai-Hui ^{[1
]}

Zeng, Yu-Ping ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2014年 / 11卷 / 05期

关键词：

BONDED SILICON-NITRIDE; MECHANICAL-PROPERTIES; MICROSTRUCTURE; FABRICATION; POROSITY; DENSE;

D O I：

10.1111/ijac.12186

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：

Porous Si3N4/SiC ceramics with high porosity were prepared via nitridation of Si powder, using SiC as the second phase and Y2O3 as sintering additive. With increasing SiC addition, porous Si3N4/SiC ceramics showed high porosity, low flexural strength, and decreased grain size. However, the sample with 20wt% SiC addition showed highest flexural strength and lowest porosity. Porous Si3N4/SiC ceramics with a porosity of 36-45% and a flexural strength of 107-46MPa were obtained. The linear shrinkage of all porous Si3N4/SiC ceramics is below 0.42%. This study reveals that the nitridation route is a promising way to prepare porous Si3N4/SiC ceramics with favorable flexural strength, high porosity, and low linear shrinkage.

引用

页码：845 / 850

页数：6

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