Journal of Materials Science

, Volume 43, Issue 9, pp 2978–2989 | Cite as

Effect of platinum on the oxide-to-metal adhesion in thermal barrier coating systems

  • H. M. TawancyEmail author
  • A. UI-Hamid
  • N. M. Abbas
  • M. O. Aboelfotoh
Interface Science


An investigation was conducted to determine the role of Pt in a thermal barrier coating system deposited on a nickel-base superalloy. Three coating systems were included in the study using a layer of yttria-stabilized zirconia as a model top coat, and simple aluminide, Pt-aluminide, and Pt bond coats. Thermal exposure tests at 1,150 °C with a 24-h cycling period to room temperature were used to compare the coating performance. Additional exposure tests at 1,000, 1,050, and 1,100 °C were conducted to study the kinetics of interdiffusion. Microstructural features were characterized by scanning electron microscopy and transmission electron microscopy combined with energy dispersive X-ray spectroscopy as well as X-ray diffraction. Wavelength dispersive spectroscopy was also used to qualitatively distinguish among various refractory transition metals. Particular emphasis was placed upon: (i) thermal stability of the bond coats, (ii) thickening rate of the thermally grown oxide, and (iii) failure mechanism of the coating. Experimental results indicated that Pt acts as a “cleanser” of the oxide-bond coat interface by decelerating the kinetics of interdiffusion between the bond coat and superalloy substrate. This was found to promote selective oxidation of Al resulting in a purer Al2O3 scale of a slower growth rate increasing its effectiveness as “glue” holding the ceramic top coat to the underlying metallic substrate. However, the exact effect of Pt was found to be a function of the state of its presence within the outermost coating layer. Among the bond coats included in the study, a surface layer of Pt-rich γ′-phase (L12 superlattice) was found to provide longer coating life in comparison with a mixture of PtAl2 and β-phase.


Bond Coat Thermal Barrier Coating Al2O3 Scale Interdiffusion Zone Thermal Barrier Coating System 


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • H. M. Tawancy
    • 1
    Email author
  • A. UI-Hamid
    • 1
  • N. M. Abbas
    • 1
  • M. O. Aboelfotoh
    • 2
  1. 1.Center for Engineering ResearchKing Fahd University of Petroleum & MineralsDhahranSaudi Arabia
  2. 2.Department of Materials Science and EngineeringNorth Carolina State UniversityRaleighUSA

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