Chapter 61. Cyclic Oxidation of Monolithic SiC and Si3N4 Materials

  1. John B. Wachtman Jr.
  1. Elizabeth J. Opila1,
  2. Dennis S. Fox2 and
  3. Charles A. Barrett2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314180.ch61

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

How to Cite

Opila, E. J., Fox, D. S. and Barrett, C. A. (1993) Cyclic Oxidation of Monolithic SiC and Si3N4 Materials, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314180.ch61

Author Information

  1. 1

    Cleveland State University Cleveland, OH 44115

  2. 2

    NASA-Lewis Research Center Cleveland, OH 44135

Publication History

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

ISBN Information

Print ISBN: 9780470375266

Online ISBN: 9780470314180

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Keywords:

  • oxidation;
  • concentrated;
  • intermetallics;
  • exposure;
  • characterized

Summary

Cyclic oxidation of monolithic CVD SiC, sintered alpha-SiC, CVD Si3N4 and HIPed Si3N4 has been performed. The oxidation behavior of samples subjected to five hour cycles in air at 1300 and 1500°C has been compared to that of samples with uninterrupted exposures of the same time and temperature. No difference between cyclic and uninterrupted oxidation rates or scale morphology was found after fifty hours of oxidation. Cyclic studies were continued to 500 hours. Typically, oxide growth continued to follow nearly parabolic kinetics and scale spallation was not observed. A comparison to models developed for cyclic oxidation of superalloys is made.