Chapter 22. Use of Indentation Technique to Measure Elastic Modulus of Plasma-Sprayed Zirconia Thermal Barrier Coating

  1. J. P. Singh
  1. J. P. Singh1,
  2. M. Sutaria1 and
  3. M. Ferber2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch22

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Singh, J. P., Sutaria, M. and Ferber, M. (1997) Use of Indentation Technique to Measure Elastic Modulus of Plasma-Sprayed Zirconia Thermal Barrier Coating, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch22

Author Information

  1. 1

    Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439

  2. 2

    Oak Ridge National Laboratory, Oak Ridge, TN 37831

Publication History

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

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • indentation;
  • ceramic layer;
  • expansion;
  • transformation;
  • elastic modulus

Summary

Elastic modulus of an yttria partially stabilized zirconia (YSZ) thermal barrier coating (TBC) was evaluated with a Knoop indentation technique. The measured elastic modulus values for the coating ranged from 68.4 ± 22.6 GPa at an indentation load of 50 g to 35.7 ± 9.8 at an indentation load of 300 g. At higher loads, the elastic modulus values did not change significantly. This steady-state value of 35.7 GPa for ZrO2 TBC agreed well with literature values obtained by the Hertzian indentation method. Furthermore, the measured elastic modulus for the TBC is lower than that reported for bulk ZrO2 (≈190 GPa). This difference is believed to be due to the presence of a significant amount of porosity and microcracks in the TBCs.