Performance of vacuum plasma spray and HVOF bond coatings at 900° and 1100 °C

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Abstract

The effects of Ti and B additions to a vacuum plasma sprayed (VPS) NiCoCrAlYHfSi bond coating on thermal barrier coating (TBC) performance were studied at 1100 °C and 900 °C and compared to high-velocity oxy-fuel (HVOF) bond coatings. Using alloy 247 substrates and air plasma sprayed Y2O3-stabilized ZrO2 top coatings, additions of B or Ti + B did not improve the average TBC lifetime in 1-h cycles at 1100 °C in air with 10% H2O. The addition of Ti resulted in a decrease in lifetime. Photo-stimulated luminescence spectroscopy was used to map residual stresses in the thermally-grown Al2O3 scale. At 900 °C, closer to a typical land based turbine operating bond coating temperature, specimens were examined after ten 500-h cycles in laboratory air and air with 10%H2O to study the effect of H2O. The addition of water vapor had little effect on the measured parabolic rate constants at 900 °C and a comparison of the oxide microstructures in both environments is reported.

Original languageEnglish
Pages (from-to)136-140
Number of pages5
JournalSurface and Coatings Technology
Volume337
DOIs
StatePublished - Mar 15 2018

Funding

The authors would like to thank Prof. S. Sampath, V. Viswanathan and G. Dwivedi at CTSR for assistance with the coating processing. At ORNL, G. Garner, T. Lowe, T. Geer, S. Waters and T. Jordan assisted with the experimental work and A. Wereszczak and E. Lara-Curzio provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Turbine Program (R. Dennis program manager and P. Burke project manager). The authors would like to thank Prof. S. Sampath, V. Viswanathan and G. Dwivedi at CTSR for assistance with the coating processing. At ORNL, G. Garner, T. Lowe, T. Geer, S. Waters and T. Jordan assisted with the experimental work and A. Wereszczak and E. Lara-Curzio provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy , Office of Fossil Energy, Turbine Program (R. Dennis program manager and P. Burke project manager).

Keywords

  • Alumina scale
  • Bond coating
  • Directionally-solidified superalloy
  • Furnace cycle testing (FCT)
  • Photo-stimulated luminescence piezospectroscopy (PLPS)
  • TBC

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