Chapter 10. Thermomechanical Behavior of Plasma-Sprayed ZrO2-Y2O3 Coatings Influenced by Plasticity, Creep, and Oxidation

  1. William Smothers
  1. J. Padovan1,
  2. B. T. F. Chung1,
  3. Glen E. McDonald2 and
  4. Robert C. Hendricks2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320402.ch10

11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8

11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8

How to Cite

Padovan, J., Chung, B. T. F., McDonald, G. E. and Hendricks, R. C. (1987) Thermomechanical Behavior of Plasma-Sprayed ZrO2-Y2O3 Coatings Influenced by Plasticity, Creep, and Oxidation, in 11th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 8, Issue 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320402.ch10

Author Information

  1. 1

    Univ. of Akron Akron, OH 44325

  2. 2

    NASA Lewis Research Center 21000 Brookpark Rd. Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780470374733

Online ISBN: 9780470320402

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Keywords:

  • creep;
  • plasticity;
  • and oxidation;
  • severe stresses;
  • subsequent spallation;
  • high-temperature environments;
  • oxidation/scaling

Summary

Thermocycling of ceramic-coated turbomachine components produces high thermomechanical stresses that are mitigated by plasticity and creep but aggravated by oxidation, with residual stresses exacerbated by all three. These residual stresses, coupled with the thermocyclic loading, lead to high compressive stresses that cause the coating to spall. In this paper a ceramic-coated gas path seal is modeled with consideration given to creep, plasticity, and oxidation. The resulting stresses and possible failure modes are discussed.