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TGO Growth and Crack Propagation in a Thermal Barrier Coating

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Abstract

In thermal barrier coating (TBC) systems, a continuous alumina layer developed at the ceramic topcoat/bond coat interface helps to protect the metallic bond coat from further oxidation and improve the durability of the TBC system under service conditions. However, other oxides such as spinel and nickel oxide, formed in the oxidizing environment, are believed to be detrimental to TBC durability during service at high temperatures. It was shown that in an air-plasma-sprayed (APS) TBC system, postspraying heat treatments in low-pressure oxygen environments could suppress the formation of the detrimental oxides by promoting the formation of an alumina layer at the ceramic topcoat/bond coat interface, leading to an improved TBC durability. This work presents the influence of postspraying heat treatments in low-pressure oxygen environments on the oxidation behavior and durability of a thermally sprayed TBC system with high-velocity oxy-fuel (HVOF)-produced Co-32Ni-21Cr-8Al-0.5Y (wt.%) bond coat. Oxidation behavior of the TBCs is evaluated by examining their microstructural evolution, growth kinetics of the thermally grown oxide (TGO) layers, and crack propagation during low-frequency thermal cycling at 1050 °C. The relationship between the TGO growth and crack propagation will also be discussed.

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Acknowledgments

The authors thank Sylvain Bélanger of the Industrial Materials Institute of NRC Canada for thermal spraying the TBC samples and Peter L’Abbe of the Institute for Chemical Process and Environmental Technology of NRC Canada for preparing the samples for LPOT. They are also grateful to Robert McKellar and Ryan MacNeil of NRC-IAR-SMPL for their help in VHT and oxidation testing. The support from the SURFTEC consortium is also appreciated.

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Authors and Affiliations

  1. Institute for Aerospace Research, SMPL, National Research Council Canada, Ottawa, ON, Canada, K1A 0R6

    W.R. Chen

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

    R. Archer & X. Huang

  3. Industrial Materials Institute, National Research Council Canada, Boucherville, QC, Canada, J4B 6Y4

    B.R. Marple

Authors
  1. W.R. Chen
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  2. R. Archer
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  3. X. Huang
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  4. B.R. Marple
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Correspondence to W.R. Chen.

Additional information

This article is an invited paper selected from presentations at the 2008 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray Crossing Borders, Proceedings of the 2008 International Thermal Spray Conference, Maastricht, The Netherlands, June 2-4, 2008, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2008.

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Chen, W., Archer, R., Huang, X. et al. TGO Growth and Crack Propagation in a Thermal Barrier Coating. J Therm Spray Tech 17, 858–864 (2008). https://doi.org/10.1007/s11666-008-9251-8

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  • DOI: https://doi.org/10.1007/s11666-008-9251-8

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