Chapter 75. Thermal Fatigue Testing of Layer-Graded Thick Thermal Barrier Coating Systems

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Robert A. Miller1,
  2. Dongming Zhu1,
  3. John G. Goedjen1,
  4. Anthony M. Calomino1 and
  5. Thomas A. Cruse2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch75

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

How to Cite

Miller, R. A., Zhu, D., Goedjen, J. G., Calomino, A. M. and Cruse, T. A. (2008) Thermal Fatigue Testing of Layer-Graded Thick Thermal Barrier Coating Systems, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch75

Author Information

  1. 1

    NASA John H. Glenn Research Center, Cleveland, OH 44135

  2. 2

    Vanderbilt University, Nashville, TN 37235

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

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Keywords:

  • layer graded bond coat systems;
  • thermal mechanical loading;
  • complex shaped components;
  • coating failure process;
  • finite element analysis

Summary

Thick thermal barrier coatings with layer-graded bond coat systems were developed for diesel engine applications. In general, coating systems for diesel applications need to be designed to minimize thermal stresses at the component edge and corner regions while providing thermal insulation and oxidation resistance. The concept of low expansion and layer-graded bond coat systems was proposed because the novel coating systems can be easily tailored to meet the stringent performance requirements under severe cyclic loading during engine operation. In this study, thermal fatigue behavior of several coating systems was evaluated using burner rigs and high heat flux laser tests under thermal transients which simulate those in diesel engines. Thermomechanical fatigue tests were also carried out for the coating systems under simultaneous thermal and mechanical fatigue conditions. Effects of the thermal-mechanical loading, interfacial temperature, and coating configuration on thermal barrier coating life were investigated. Experiments showed that the layer-graded bond coat system possesses lower interfacial stresses and excellent oxidation resistance as compared to conventional thick TBC coating systems, thus significantly improving the coating performance and durability.