Chapter 71. Elucidating Thermo-Mechanical Spallation of Thermal Barrier Coating-Systems Using Controlled Indentation Flaws

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Marion Bartsch1 and
  2. Edwin R. Fuller Jr.2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch71

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

How to Cite

Bartsch, M. and Fuller, E. R. (2003) Elucidating Thermo-Mechanical Spallation of Thermal Barrier Coating-Systems Using Controlled Indentation Flaws, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294802.ch71

Author Information

  1. 1

    Bemd Baufeld German Aerospace Center (DLR) D-51147 Cologne, GERMANY

  2. 2

    National Institute of Standards and Technology (NIST) Gaithersburg, MD 20899, U.S.A.

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375839

Online ISBN: 9780470294802

SEARCH

Keywords:

  • thermal barrier coatings;
  • crack initiation;
  • monotonic loading;
  • bond coat;
  • thermally grown oxide

Summary

Ceramic thermal barrier coatings (TBC) can exhibit premature in-service failure due to spallation as a consequence of exposure to elevated temperatures, aggressive environments, and cyclic loading. Lifetime assessment for TBC-systems requires methods for characterizing damage accumulation that lead to spallation as a function of loading history. in this study controlled flaws were introduced into cylindrical TBC coated specimens by indentation. These controlled flaws were introduced to ultimately characterize the interfacial fracture toughness of thermally cycled specimens, as well as of specimens that underwent more realistic thermo-mechanical cycling with a thermal gradient across the coating. Indentation flaws introduced before testing were used to investigate the topcoat spallation phenomenon and bond coat rumpling behavior as a function of thermo-mechanical cycling conditions.