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High temperature oxidation of Ni-20Cr-12.5Al coatings containing 1% dispersed oxides

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Abstract

Oxidation studies were conducted on plasma sprayed coatings of Ni-20Cr-12.5Al containing one of the following: 1% MgO, 1% La2O3, 1% Y2O3, and 0.8% Y. The alloy powders containing dispersed oxides were prepared by a variety of processes employing attrition and ball milling. The TEM characterization of the plasma sprayed deposits of Ni-20Cr-12.5Al-1Y2O3 indicated that the oxide particles ranged from almost pure aluminum oxide to various compounds of aluminum and yttrium oxide. In cyclic tests conducted at 1150 and 1225°C, the coating containing 1% Y2O3 appeared to provide the best oxidation resistance. The oxidation resistance appeared to be influenced by the size and distribution of the oxide particles.

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Authors and Affiliations

  1. Corporate Research and Development, General Electric Company, 12345, Schenectady, NY

    Krishan L. Luthra & Ernest L. Hall

Authors
  1. Krishan L. Luthra
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  2. Ernest L. Hall
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Luthra, K.L., Hall, E.L. High temperature oxidation of Ni-20Cr-12.5Al coatings containing 1% dispersed oxides. Oxid Met 26, 385–396 (1986). https://doi.org/10.1007/BF00659343

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  • DOI: https://doi.org/10.1007/BF00659343

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