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Effects of Cr–Si Diffusion Barrier Layer on the Oxidation Resistance of NiCrAlY Coating System with Aluminized Top Layer

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Abstract

A multilayer coating, which consisted of a Cr–Si co-deposited layer as the diffusion barrier, a plasma sprayed NiCrAlY middle layer, and an aluminized top layer, was developed. During the aluminizing treatment, Cr in the NiCrAlY layer was released as the γ/γ′ structure of this layer transformed to the β phase. The released Cr was inhibited by the inner Cr–Si layer to diffuse into the substrate, and a Cr layer eventually formed over the Cr–Si layer. The Cr layer impeded the inward diffusion of Al due to the low solubility of Al in the Cr layer so that more Al atoms remain in the coating and contributed to the oxidation resistance of the coating. The multilayer coating exhibited better oxidation and spallation resistance than coatings without a Cr–Si layer, at least at 1050 °C for up to 1000 h.

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Acknowledgments

This research was supported by National Science and Engineering Council of Canada.

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Authors and Affiliations

  1. Life Prediction Technologies Inc., Unit 23, 1010 Polytek Street, Ottawa, ON, K1J 9J1, Canada

    F. Gao

  2. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada

    X. Huang & R. Liu

  3. Aerospace Portfolio, National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada

    Q. Yang

Authors
  1. F. Gao
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  2. X. Huang
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  3. Q. Yang
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  4. R. Liu
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Correspondence to F. Gao.

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Gao, F., Huang, X., Yang, Q. et al. Effects of Cr–Si Diffusion Barrier Layer on the Oxidation Resistance of NiCrAlY Coating System with Aluminized Top Layer. Oxid Met 85, 425–442 (2016). https://doi.org/10.1007/s11085-015-9604-x

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  • DOI: https://doi.org/10.1007/s11085-015-9604-x

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