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Isothermal Oxidation Behavior of NiCoCrAlTaY Coating Deposited by High Velocity Air-Fuel Spraying

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Abstract

The performance of thermal barrier coatings is influenced by the high temperature oxidation behavior of the bond coat. In this paper, NiCoCrAlTaY bond coat was deposited by high velocity air-fuel (HVAF) spraying, and the microstructure and surface morphology of the bond coat before and after oxidation were examined to aim at developing high performance thermal barrier coatings. Results showed that the HVAF sprayed NiCoCrAlTaY coating presented a dense microstructure and some partially melted particles with a near spherical morphology were deposited on the coating surface. A uniform α-Al2O3 scale was formed on the HVAF sprayed MCrAlY coating surface after the pre-oxidation treatment in an argon atmosphere. A small fraction of nodular-shaped mixed oxides was formed when the MCrAlY coating was oxidized for 100 h at 1000 °C. The amount of the mixed oxides increased less significantly after 200 h oxidation. A homogeneous α-Al2O3 oxide scale was maintained over the large particles on the bond coat surface after 200 h oxidation at 1000 °C in air. A model is proposed to explain the formation of nodular-shaped mixed oxides.

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Acknowledgments

The present project was supported by National Natural Science Foundation for the Distinguished Young Scholars of China (Grant No. 50725101) and Program for New Century Excellent Talents in University (No. NCET-08-0443).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, People’s Republic of China

    Guan-Jun Yang, Lu-Kuo Xing, Chang-Jiu Li & Cheng-Xin Li

  2. DongFang Turbine Co., Ltd., Deyang, 618000, Sichuan, People’s Republic of China

    Xu-Dong Xiang & Ding-Jun Li

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  1. Guan-Jun Yang
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Correspondence to Chang-Jiu Li.

Additional information

This article is an invited paper selected from presentations at the 2011 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2011: Proceedings of the International Thermal Spray Conference, Hamburg, Germany, September 27-29, 2011, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and André McDonald, Ed., ASM International, Materials Park, OH, 2011.

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Yang, GJ., Xiang, XD., Xing, LK. et al. Isothermal Oxidation Behavior of NiCoCrAlTaY Coating Deposited by High Velocity Air-Fuel Spraying. J Therm Spray Tech 21, 391–399 (2012). https://doi.org/10.1007/s11666-012-9740-7

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  • DOI: https://doi.org/10.1007/s11666-012-9740-7

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