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Correlation of microstructure and high temperature oxidation resistance of plasma sprayed NiCrAl, NiCrAlY, and TiAlO composite coatings on Ti−6Al−4V

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Abstract

In the present study Ni−18Cr−6Al, Ni−22Cr−10Al−1Y and TiAlO composite powders were coated on Ti−6Al−4V substrates by atmospheric plasma spraying, and the coated specimens were evaluated by isothermal and cyclic oxidation resistance tests at 800°C. The oxidation kinetics of the plasma sprayed NiCrAl, NiCrAlY, and TiAlO composite coated specimens obey a parabolic rate law. The oxidation resistance of the plasma sprayed NiCrAl and NiCrAlY coatings is superior to that of plasma sprayed TiAlO composite coating. The best oxidation resistance was observed in the plasma sprayed NiCrAlY coatings. This is mainly attributed to the formation of Y−Al−O complex oxides and Ni3Al with higher thermal stability on the coatings.

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Authors and Affiliations

  1. School of Advanced Materials Engineering & Research Center of Industrial Technology, Engineering Research Institute, Chonbuk National University, Deokjindong 1-ga, Deokjin-gu, Jeonju-si, 561-756, Jeonbuk, Korea

    Byung-Young Choi

  2. Department of Chemical & Materials Engineering, the University of Auckland, New Zealand

    Jing Liang & Wei Gao

Authors
  1. Byung-Young Choi
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  2. Jing Liang
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  3. Wei Gao
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Correspondence to Byung-Young Choi.

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Choi, BY., Liang, J. & Gao, W. Correlation of microstructure and high temperature oxidation resistance of plasma sprayed NiCrAl, NiCrAlY, and TiAlO composite coatings on Ti−6Al−4V. Met. Mater. Int. 11, 499–503 (2005). https://doi.org/10.1007/BF03027500

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