Chapter 69. The Behavior of two Si3N4 and Two SiC Ceramics Subject to Oxidation Environments

  1. J. P. Singh
  1. H. S. Rho,
  2. N. L. Hecht and
  3. G. A. Graves

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch69

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Rho, H. S., Hecht, N. L. and Graves, G. A. (1997) The Behavior of two Si3N4 and Two SiC Ceramics Subject to Oxidation Environments, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch69

Author Information

  1. University of Dayton Research Institute Dayton, Ohio 45469

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • gas turbine engines;
  • ceramics;
  • microstructure;
  • oxidizing environment;
  • service conditions

Summary

SiC and Si3N4 ceramics are the primary candidates for use in stationary gas turbine engines. The use of these ceramics in turbine engines will require that they demonstrate long time survival in severe operating environments. A study was initiated to investigate the effects of air and air containing H2O on the behavior of two Si3N4 and two SiC ceramics. The nature of the oxide scale formed (chemistry, microstructure and macrostructure) and the changes in specimen weight were evaluated. Flexural dynamic fatigue of three of the candidate ceramics was measured in air and air with 6.4 v/o H2O at temperature from 1038 to 1350°C. In addition, the effects of applied flexural stress on polished SiC and Si3N4 test bars in an oxidizing environment at 1320°C for 50 h was investigated.