Chapter 44. Measurements of Stress Distribution in top Coat and TGO Layers Processed by EB–PVD

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. Toru Tomimatsu,
  2. Shijie Zhu and
  3. Yutaka Kagawa

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch44

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

How to Cite

Tomimatsu, T., Zhu, S. and Kagawa, Y. (2002) Measurements of Stress Distribution in top Coat and TGO Layers Processed by EB–PVD, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294758.ch44

Author Information

  1. Institute of Industrial Science, The University of Tokyo 4–6–1, Kotnaba, Meguro-ku, Tokyo 153–8505, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375792

Online ISBN: 9780470294758

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Keywords:

  • stress distributions;
  • TGO layers;
  • physical vaporization;
  • thermal barrier coatings;
  • spectroscopy

Summary

Measurements of stress distributions in top coat and TGO layers of EB–PVD TBC have been carried out. It is found that the stress in the top coat layer in as deposited state is –3.5 GPa and it reduces to ∼1 GPa after isothermal heat exposure in air. The stress in the TGO layer is an order of –1 GPa. The stress in the top coat layer decreases with the increase of heat exposure time and that in the TGO layer vice versa. This change originates from the release of residual stress during deposition process and change in force-balance, which originates from the growth of TGO layer.