Chapter 59. Furnace Cyclic Behavior of Plasma–Sprayed Zirconia–Yttria and Multi–Component Rare Earth Oxide Doped Thermal Barrier Coatings

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. Dongming Zhu,
  2. James A. Nesbitt,
  3. Terry R Mccue,
  4. Charles A. Barrett and
  5. Robert A. Miller

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch59

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

Zhu, D., Nesbitt, J. A., Mccue, T. R., Barrett, C. A. and Miller, R. A. (2002) Furnace Cyclic Behavior of Plasma–Sprayed Zirconia–Yttria and Multi–Component Rare Earth Oxide Doped Thermal Barrier Coatings, 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.ch59

Author Information

  1. NASA John H. Glenn Research Center 21000 Brookpark Road, Cleveland, OH 44135

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:

  • ceramic thermal barrier coatings;
  • gas turbine engines;
  • furnace thermal cyclic behavior;
  • rare earth;
  • furnace cyclic tests

Summary

Ceramic thermal barrier coatings will play an increasingly important role in advanced gas turbine engines because of their ability to enable further increases in engine temperatures. However, the coating performance and durability become a major concern under the increasingly harsh thermal cycling conditions. Advanced zirconia-and hafhia-based cluster oxide thermal barrier coatings-having lower thermal conductivity and improved thermal stability-are being developed using a high-heat-flux laser-rig based test approach. Although the new composition coatings were not yet optimized for cyclic durability, an initial durability screening of numerous candidate coating materials was carried out using conventional furnace cyclic tests. In this paper, furnace thermal cyclic behavior of the advanced plasma-sprayed zirconia-yttria-based thermal barrier coatings that were co-doped with multi-component rare earth oxides was investigated at 1163°C using 45 min hot cycles. The ceramic coating failure mechanisms were studied by using scanning electron microscopy combined with X–ray diffraction phase analysis after the furnace tests. The coating cyclic lifetime will be discussed in relation to coating phase structures, total dopant concentrations and other properties.