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Oxidation behavior of rare earth oxide-coated Fe20Cr and Fe20Cr5Al alloys

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Abstract

This article presents the influence of surface additions of nanocrystalline rare earth (RE) oxides CeO2, La2O3, and CeO2 + La2O3 on the isothermal oxidation behavior of Fe20Cr and Fe20Cr5Al at 1000 °C. Thermogravimetric studies revealed parabolic kinetics in all cases and the scale thickness on specimen surfaces varied with the nature of RE oxide. The oxidation resistance of specimens coated with two RE oxides was significantly higher than those coated with either one of the two oxides. The marked increase in the oxidation resistance of the alloys coated with two RE oxides is due to optimization of RE ion radius and RE oxide grain size/shape.

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Authors and Affiliations

  1. Instituto de Pesquisas Energéticas e Nucleares—IPEN-CNEN/SP, São Paulo, Brazil

    Stela M. C. Fernandes, Olandir V. Correa & Lalgudi V. Ramanathan

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  1. Stela M. C. Fernandes
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  2. Olandir V. Correa
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  3. Lalgudi V. Ramanathan
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Correspondence to Lalgudi V. Ramanathan.

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Fernandes, S.M.C., Correa, O.V. & Ramanathan, L.V. Oxidation behavior of rare earth oxide-coated Fe20Cr and Fe20Cr5Al alloys. J Therm Anal Calorim 106, 541–543 (2011). https://doi.org/10.1007/s10973-011-1563-0

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  • DOI: https://doi.org/10.1007/s10973-011-1563-0

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