62. Micromechanisms Affecting Macroscopic Deformation of Plasmasprayed TBCs

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. E. Trunova,
  2. R. Herzog,
  3. T. Wakui,
  4. R. W. Steinbrech,
  5. E. Wessel and
  6. L. Singheiser

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch62

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Trunova, E., Herzog, R., Wakui, T., Steinbrech, R. W., Wessel, E. and Singheiser, L. (2004) Micromechanisms Affecting Macroscopic Deformation of Plasmasprayed TBCs, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch62

Author Information

  1. Research Centre Juelich Institute for Materials and Processes in Energy Systems (IWV 2) Leo-Brandt Street, Juelich, Germany 52428

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • thermal barrier coatings;
  • thermal radiation;
  • zirconia;
  • semitransparent materials;
  • ceramics

Summary

Compressive creep tests have been performed on separated, free-standing, air plasmasprayed thermal barrier coatings (zirconia doped with 7-8 wt% yttria) under constant load in the temperature range RT-1150°C. A small creep effect was observed in the temperature range RT-950°C and an increasingly larger effect in the range 950°C-1150°C. At 1150°C a permanent strain of 2.8% occurred after 10 h at 80 MPa. The macroscopic apparent elastic modulus of the TBC (stiffness) increased during that specific deformation from 25 to 120 GPa. The effect of mechanical loading on stiffness at high temperature is much more pronounced than densification by sintering during isothermal heat treatment. Microstructural changes related to deformation and creep were studied by in situ observation in the SEM as well as by comparing the SEM images before and after deformation using an image correlation program.