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Adherence and Failure of an EBPVD 7YSZ Coating on a β/γ-NiCrAl Substrate: A Pilot Study

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Abstract

Oxidation, lifetime and crack path at failure upon furnace oxidation testing at 1100 °C were evaluated for an undoped alumina-forming NiCrAl alloy/7YSZ (7 wt% yttria stabilized zirconia) coating system. The coating was deposited by electron beam physical vapor deposition (EBPVD). The thermally grown oxide (TGO) was investigated by energy dispersive spectroscopy. The outer zone of the TGO comprised a particular interlayer-denominated mixed zone (MZ), which revealed accumulation of Cr together with Y and Zr. The contents of Y and Zr in the MZ of the undoped sample were in good agreement with compositional data previously evaluated for thermal barrier coating (TBC) systems with EBPVD NiCoCrAlY bond coats versus relative lifetime. These data are considered characteristic measures of the stage of life for EBPVD TBC systems.

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Acknowledgments

The authors would like to thank Wolfgang Braue for insightful discussions and comprehensive proofreading of the paper, Philipp Watermeyer for Monte Carlo simulations, and Eberhard Marx for graphic work.

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Authors and Affiliations

  1. Institute of Materials Research, DLR-German Aerospace Center, 51170, Cologne, Germany

    Klaus Fritscher, Claus-Jürgen Kröder & Uwe Schulz

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  1. Klaus Fritscher
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  2. Claus-Jürgen Kröder
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  3. Uwe Schulz
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Correspondence to Klaus Fritscher.

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Fritscher, K., Kröder, CJ. & Schulz, U. Adherence and Failure of an EBPVD 7YSZ Coating on a β/γ-NiCrAl Substrate: A Pilot Study. Oxid Met 86, 279–298 (2016). https://doi.org/10.1007/s11085-016-9636-x

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  • DOI: https://doi.org/10.1007/s11085-016-9636-x

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