Porous S i 3 N 4 / S i C Ceramics Prepared via Nitridation of Si Powder with S i C Addition

Porous S i 3 N 4 / S i C ceramics with high porosity were prepared via nitridation of S i powder, using S i C as the second phase and Y 2 O 3 as sintering additive. With increasing S i C addition, porous S i 3 N 4 / S i C ceramics showed high porosity, low flexural strength, and decreased grain size...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2014-09, Vol.11 (5), p.845-850
Main Authors: Hu, Hai‐Long, Yao, Dong‐Xu, Xia, Yong‐Feng, Zuo, Kai‐Hui, Zeng, Yu‐Ping
Format: Article
Language:English
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Summary:Porous S i 3 N 4 / S i C ceramics with high porosity were prepared via nitridation of S i powder, using S i C as the second phase and Y 2 O 3 as sintering additive. With increasing S i C addition, porous S i 3 N 4 / S i C ceramics showed high porosity, low flexural strength, and decreased grain size. However, the sample with 20wt% S i C addition showed highest flexural strength and lowest porosity. Porous S i 3 N 4 / S i C ceramics with a porosity of 36–45% and a flexural strength of 107‐46MPa were obtained. The linear shrinkage of all porous S i 3 N 4 / S i C ceramics is below 0.42%. This study reveals that the nitridation route is a promising way to prepare porous S i 3 N 4 / S i C ceramics with favorable flexural strength, high porosity, and low linear shrinkage.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12186