Chapter 31. Self-Reinforced Silicon Nitride by Gas Pressure Sintering

  1. John B. Wachtman Jr.
  1. Fengying Wu,
  2. Hanrui Zhuang,
  3. Litai Ma and
  4. Xiren Fu

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314050.ch31

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

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. (2008) 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

Author Information

  1. Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375235

Online ISBN: 9780470314050

SEARCH

Keywords:

  • gas pressure sintering;
  • silicon nitride;
  • lacontaining glassy phase;
  • sintering temperatures;
  • electron microprobe

Summary

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:

  1. 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.

  2. 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.

  3. 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.