Oxidation behavior of rare earth oxide-coated Fe20Cr and Fe20Cr5Al alloys |
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| Authors: | Stela M C Fernandes Olandir V Correa and Lalgudi V Ramanathan |
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| Institution: | (1) Instituto de Pesquisas Energ?ticas e Nucleares—IPEN-CNEN/SP, S?o Paulo, Brazil; |
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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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