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Journal of Materials Science

, Volume 38, Issue 18, pp 3797–3807 | Cite as

Effect of superalloy substrate composition on the performance of a thermal barrier coating system

  • H. M. Tawancy
  • A. I. Mohamed
  • N. M. Abbas
  • R. E. Jones
  • D. S. Rickerby
Article

Abstract

An investigation was carried out to determine the performance of a thermal barrier coating system consisting of (ZrO2-8% Y2O3)/(Pt) on two single-crystal Ni-base superalloys. Coating/alloy behavior was studied with reference to: (i) initial microstructural features, (ii) oxidation properties, (iii) thermal stability characteristics, and (iv) failure mechanism. All thermal exposure tests were carried out at 1150°C in still air with a 24-h cycling period to room temperature. Failure of the coating system was indicated by macroscopic spallation of the ceramic top coat. Scanning electron microscopy combined with energy dispersive X-ray spectroscopy as well as X-ray diffraction were used to characterize the microstructure.

Decohesion between the thermally grown oxide and bond coat was found to be the mode of failure of the coating system for both alloys. This was correlated with the formation of Ti-rich and/or Ti+Ta-rich oxide particles near the oxide-bond coat interface degrading the adherence of the thermally grown oxide. However, the thickening rate of the oxide had very little or no effect on the relative coating performance. It was concluded that the coating performance is critically dependent on alloy substrate composition particularly the concentration of elements, which could have adverse effects on oxidation resistance such as Ti.

Keywords

Y2O3 Coating Performance Bond Coat Substrate Composition Thermal Barrier Coating System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • H. M. Tawancy
    • 1
  • A. I. Mohamed
    • 1
  • N. M. Abbas
    • 1
  • R. E. Jones
    • 2
  • D. S. Rickerby
    • 2
  1. 1.Materials Characterization Laboratory, Center for Engineering ResearchResearch Institute, King Fahd University of Petroleum and MineralsDhahranSaudi Arabia
  2. 2.Rolls-Royce plcDerbyUK

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