19. Nondestructive Evaluation Methods for High Temperature Ceramic Coatings

  1. Dongming Zhu,
  2. Uwe Schulz,
  3. Andrew Wereszczak and
  4. Edgar Lara-Curzio
  1. William A. Ellingson,
  2. Rachel Lipanovich,
  3. Stacie Hopson and
  4. Robert Visher

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291320.ch19

Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3

Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3

How to Cite

Ellingson, W. A., Lipanovich, R., Hopson, S. and Visher, R. (2006) Nondestructive Evaluation Methods for High Temperature Ceramic Coatings, in Advanced Ceramic Coatings and Interfaces: Ceramic Engineering and Science Proceedings, Volume 27, Issue 3 (eds D. Zhu, U. Schulz, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291320.ch19

Author Information

  1. Argonne National Laboratory 9700 S. Cass Avenue Argonne, IL 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080535

Online ISBN: 9780470291320

SEARCH

Keywords:

  • BSAS;
  • FGI;
  • CMC;
  • APS;
  • NDE

Summary

Various high temperature ceramic coatings are under development for components for the hot gas path of gas turbine engines. These coatings are being developed for both metal and ceramic substrates. Regardless of the coating system, environmental barrier coatings for ceramics or thermal barrier coatings for metals, there is a need to determine the condition of the coating as well as determine physical parameters such as thickness. Two laser-based, non-contact, nondestructive methods are being developed that provide information regarding the condition or “health” of the coating, including thickness variations. The elastic optical scatter (EOS) method has been demonstrated to correlate to spall conditions for thermal barrier coatings however there has been a question about sensitivity to surface features. The laser-based optical coherence tomography (OCT) method has been demonstrated to provide thickness measurements for thermal and environmental barrier coatings. Several well-controlled sample sets have been examined with these two NDE methods and extensive data have been acquired. The test methods, test samples, and results obtained to date showing correlations with destructive measurements are presented.