M. Mueller—contributing editor
The Effects of BN Addition on the Mechanical Properties of Porous Si3N4/BN Ceramics Prepared Via Nitridation of Silicon Powder
Article first published online: 15 FEB 2011
© 2011 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 3, pages 666–670, March 2011
How to Cite
Yao, D., Zeng, Y.-P., Zuo, K.-H. and Jiang, D. (2011), The Effects of BN Addition on the Mechanical Properties of Porous Si3N4/BN Ceramics Prepared Via Nitridation of Silicon Powder. Journal of the American Ceramic Society, 94: 666–670. doi: 10.1111/j.1551-2916.2010.04371.x
This work was supported by National Natural Science Foundation of China (No. 5087214 and No.50902140).
- Issue published online: 11 MAR 2011
- Article first published online: 15 FEB 2011
- Manuscript No. 28565. Received September 6, 2010; approved December 2, 2010.
Porous Si3N4/BN ceramics were prepared via nitridation of silicon powder, with Si and BN as starting powder, Y2O3 as sintering additive. After nitridation and sintering at 1680°C, porous Si3N4/BN ceramics with a porosity of 47%–51% and a flexural strength of 170–90 MPa were obtained. Compared with pure porous Si3N4 ceramics, the grains of porous Si3N4/BN ceramics were finer, the aspect ratio of β-Si3N4 grains was higher, and the pore size was decreased, which can be attributed to grain-boundary pinning due to BN dispersions. The relatively high flexural strength was obtained with 5% BN addition. The porous Si3N4/BN ceramics also showed low shrinkage and machinable properties.