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A new theoretical approach to the thermodynamic calculation of high-temperature oxidation of Ni-Cr alloys

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Abstract

In calculations, not only the Gibbs formation energy of nickel and chromium oxides and thermodynamic activities of the alloy components, but also the Gibbs surface energy of a Ni-Cr alloy is taken into account. The method is based on the adsorption model of the alloy oxidation, according to which the adsorption of an alloy component with the smaller surface energy, namely, nickel, at the alloy-oxide film interface boundary shifts the dynamic equilibrium between the alloy and oxide-film components toward the formation of NiO. For the oxidation of Ni-Cr alloys, which are solid solutions with an fcc lattice, at 1123 to 1473 K, concentration boundaries of the chromium content in the alloy are calculated for the case of the prevailing formation of Cr2O3 oxide, which determines the high heat resistance of Ni-Cr alloys.

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Authors and Affiliations

  1. Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936, Russia

    Yu. Ya. Andreev & A. A. Shumkin

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  1. Yu. Ya. Andreev
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  2. A. A. Shumkin
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Original Russian Text © Yu.Ya. Andreev, A.A. Shumkin, 2006, published in Zashchita Metallov, 2006, Vol. 42, No. 3, pp. 239–244.

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Andreev, Y.Y., Shumkin, A.A. A new theoretical approach to the thermodynamic calculation of high-temperature oxidation of Ni-Cr alloys. Prot Met 42, 221–226 (2006). https://doi.org/10.1134/S0033173206030039

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