Chapter 19. Thermochemical Analysis of Chemical Processes Relevant to the Stability and Processing of SiC-Reinforced Si3N4 Composite

  1. John B. Wachtman Jr
  1. Ajay K. Misra

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch19

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10

How to Cite

Misra, A. K. (2008) Thermochemical Analysis of Chemical Processes Relevant to the Stability and Processing of SiC-Reinforced Si3N4 Composite, in Proceedings of the 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 12, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313848.ch19

Author Information

  1. Sverdrup Technology, Inc. NASA Lewis Research Center Group Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1991

ISBN Information

Print ISBN: 9780470375105

Online ISBN: 9780470313848

SEARCH

Keywords:

  • thermochemical;
  • monolithic;
  • monofilament;
  • thermodynamic;
  • equilibrium

Summary

Chemical processes relevant to the stability and processing of SiC-reinforced Si3N4 composites have been examined from thermochemical considerations. The thermodynamic stabilities of various interfaces, such as SiC-Si3N4, SiC-Si3N4, Si2ON2, and SiC-Si3N4-SiO2, have been examined as a function of temperature, and the temperatures above which these interfaces become unstable have been calculated. The degradation of SiC during the processing of the composite has been examined. The processing routes considered in this study include the reaction bonded silicon nitride (RBSN) process and the pressure-assisted sintering processes with suitable sintering additives.