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Influence of Bond Coats on the Microstructure and Mechanical Behaviors of HVOF-Deposited TiAlNb Coatings

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Abstract

Hot dip galvanizing has been extensively employed for corrosion protection of steel structures. However, during the process of galvanization, the corrosion in molten zinc brings many problems to galvanization industry. In this study, as a material of corrosion resistance to molten zinc intended for application in Hot-dip galvanization, HVOF Ti28.15Al63.4Nb8.25Y (at.%) coatings with different bond coats (NiCr5Al, NiCoCrAlY, CoCrAlYTaSi, and NiCr80/20) were deposited onto 316L stainless steel substrate, respectively. The influences of different bond coats on HVOF Ti28.15Al63.4Nb8.25Y coatings were investigated. The results showed that bond coat had an obvious influence on improving the mechanical properties of HVOF Ti28.15Al63.4Nb8.25Y coatings. HVOF Ti28.15Al63.4Nb8.25Y coatings with NiCoCrAlY bond coat displayed the best mechanical properties. However, bond coats had no obvious effects on the microstructure, porosity, and hardness of HVOF Ti28.15Al63.4Nb8.25Y top coatings. The effects of as-received powder morphology and grain size on the characteristics of coatings were also discussed.

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Acknowledgments

The authors wish to acknowledge the financial support received from the National Key Basic Research Program of China (973 Program, No. 2011CB605502, the National Natural Science Foundation of China under Contract No. 50871127 and the State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, under contract No. 2008Z-05, as well as D.W. An for his assistance with the thermal spraying equipment.

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    H. J. Zeng, L. Q. Zhang, J. P. Lin & X. Y. He

  2. Beijing Langqiao Surface Technology Co., Ltd., Beijing, 100089, People’s Republic of China

    Y. C. Zhang & P. Jia

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  1. H. J. Zeng
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Correspondence to H. J. Zeng.

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Zeng, H.J., Zhang, L.Q., Lin, J.P. et al. Influence of Bond Coats on the Microstructure and Mechanical Behaviors of HVOF-Deposited TiAlNb Coatings. J Therm Spray Tech 21, 1245–1256 (2012). https://doi.org/10.1007/s11666-012-9825-3

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  • DOI: https://doi.org/10.1007/s11666-012-9825-3

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