Chapter 7. High-Temperature Properties of a Silicon Nitride-Intermetallic Silicide Composite

  1. John B. Wachtman Jr
  1. Roger L. K. Matsumoto and
  2. G. Gregory Weaver

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313848.ch7

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

Matsumoto, R. L. K. and Weaver, G. G. (1991) High-Temperature Properties of a Silicon Nitride-Intermetallic Silicide 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.ch7

Author Information

  1. Hercules Incorporated Research Center Wilmington, DE 19894

Publication History

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

ISBN Information

Print ISBN: 9780470375105

Online ISBN: 9780470313848

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Keywords:

  • temperature;
  • mechanisms;
  • microstructure;
  • graphite;
  • nitride

Summary

Ceramic composites composed of a silicon nitride matrix containing a dispersed silicide phase have been fabricated. While many silicides are brittle at room temperature, they become ductile at high temperatures as they undergo a brittle-to-ductile transition. In contrast to composites having silicides as the matrix phase, the material examined contains dispersed cobalt silicide particulates and has a room temperature toughness of 10 MPa·m. The toughness increases to 12 MPa·m at 800°C. When the brittle-to-ductile transition temperature is exceeded, the toughness at 1100°C drops to 6 MPa·m.