Chapter 31. Self-Reinforced Silicon Nitride by Gas Pressure Sintering
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1993 The American Ceramic Society
A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2
How to Cite
Wu, F., Zhuang, H., Ma, L. and Fu, X. (1993) Self-Reinforced Silicon Nitride by Gas Pressure Sintering, in A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314050.ch31
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375235
Online ISBN: 9780470314050
- gas pressure sintering;
- silicon nitride;
- lacontaining glassy phase;
- sintering temperatures;
- electron microprobe
The gas pressure sintering (GPS) behavior of reaction-bonded silicon nitride (RBSN) with Yfi3 and La/)3 additives has been studied It has been found that:
Under the pressure range of the present work, the aspect ratio of grains increased with raising the nitrogen pressure during sintering. The bend strength of the sintered material increased with raising the aspect ratio.
The grain boundary phase of material obtained is composed ofY- and La-containing glassy phase and a small amount of H (Y10(SiO4)6N2) and K ((Y,La)2O3.Si2N2O) crystals. Raising the nitrogen pressure increased the nitrogen content within the grain boundary glassy phase and the viscosity of the glassy phase.
The existence of a large number of pores at the early sintering stage, a certain amount of liquid phase, and high nitrogen pressure during sintering are beneficial to the formation of a silicon nitride ceramic material with high aspect ratio of grains.