Abstract
Cold gas dynamic spray (CGDS) has been considered a potential technique to produce the metallic bond coat for TBC applications, because of its fast deposition rate and low deposition temperature. This article presents the influence of spray processes for bond coat, including air plasma spray, high velocity oxy-fuel, and in particular CGDS, on the oxidation performance of TBCs with a Co-32Ni-21Cr-8Al-0.5Y (wt.%) bond coat and an air plasma sprayed topcoat. Oxidation behavior of the TBCs was evaluated by examining the coating microstructural evolution, TGO growth behavior, and crack propagation during thermal exposure at 1050 °C. The relationship between the TGO growth and crack propagation will be discussed.
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Acknowledgments
The authors thank Sylvain Bélanger and Frédéric Belval of the Industrial Materials Institute of NRC Canada for thermal spraying the TBC samples.
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This article is an invited paper selected from presentations at the 2010 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray: Global Solutions for Future Applications, Proceedings of the 2010 International Thermal Spray Conference, Singapore, May 3-5, 2010, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2011.
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Chen, W.R., Irissou, E., Wu, X. et al. The Oxidation Behavior of TBC with Cold Spray CoNiCrAlY Bond Coat. J Therm Spray Tech 20, 132–138 (2011). https://doi.org/10.1007/s11666-010-9601-1
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DOI: https://doi.org/10.1007/s11666-010-9601-1