Role of rare earth oxide coatings on oxidation resistance of chromia-forming alloys |
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Authors: | Lalgudi Venkataraman Ramanathan Marina F Pillis Stela Maria C Fernandes |
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Affiliation: | (1) Materials Science and Technology Center, Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes 2242, Cidade Universitaria, Sao Paulo, SP, 05508-000, Brazil |
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Abstract: | Rare earths (RE) have been used to increase high temperature oxidation resistance of chromia and alumina forming alloys. The
RE can be added as elements (or oxides) to the alloys or applied as oxide coatings to the alloy surface. This paper presents
the effect of different RE oxide coatings and lanthanum chromite coatings on the high temperature oxidation behavior of Fe20Cr
and Fe20Cr4Al alloys. The oxidation resistance of the Fe20Cr alloy increased with increase in ionic radius of the RE element
in the coating. The RE oxides decreased chromia growth rate more than alumina growth rate. In extended cyclic oxidation tests
that were carried out from peak temperatures of 900 °C, 1,000 °C and 1,100 °C to room temperature at cooling rates of 300 °C/s
and 1,000 °C/s, the La2O3 coating increased cyclic oxidation resistance of the Fe20Cr alloy significantly more than the Pr2O3 coating. The role of RE in increasing overall oxidation resistance of chromia forming alloys is discussed. |
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