OLANDIR VERCINO CORREA
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Artigo IPEN-doc 20477 Effect of sol-gel preparation technique of mixed nanocrystalline rare earth oxide coatings on high temperature oxidation behavior of Fesup(2)0Cr5al alloy2014 - FERNANDES, S.M.C.; CORREA, O.V.; RAMANATHAN, L.V.Resumo IPEN-doc 18664 Effect of mixed rare earth oxide gel coatings on the high temperature oxidation behavior of iron-chromium alloys2012 - FERNANDES, STELA M.; CORREA, OLANDIR V.; RAMANATHAN, LALGUDI V.Resumo IPEN-doc 12585 Cyclic oxidation resistance of rare earth oxide gel coated Fe-Cr alloys2006 - FERNANDES, S.M.C.; CORREA, O.V.; RAMANATHAN, L.V.Use of rare earths to increase high temperature oxidation resistance of chromium dioxide and alumina forming alloys is well known. Rare earth oxide coatings obtained by the solgel technique have been found to be very efficient to apply fine oxide coatings. The cyclic oxidation resistance (RT-900ºC) of Fe-Cr alloy coated with various rare earth oxide gel coatings (La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, Gd2O3, Dy2O3, Y2O3, Er2O3, and Yb2O3) was determined. Specimens coated with La2O3 and Pr2O3 gels were found to be the most resistant to cyclic oxidation. In an extension of this study, the effect of cooling rate, (and consequently thermal shock resistance) from the peak temperature (900ºC, 1000ºC, 1100ºC) to room temperature of specimens coated with La2O3 and Pr2O3 gels was studied. The morphology and coverage of the rare earth oxide gels varied with the type of rare earth. The cyclic oxidation resistance increased with increase in time at temperature required to reach a specific chromium dioxide layer thickness. This in turn was influenced by rare earth ion radius and other characteristics of the rare earth oxide coating such as morphology, stability, coverage, resistance to thermal stresses and adhesion.Artigo IPEN-doc 16154 Optimization of rare earth additions to increase high temperature oxidation resistance of chromia and alumina forming alloys2010 - FERNANDES, STELA M.; CORREA, OLANDIR V.; RAMANATHAN, LALGUDI V.Artigo IPEN-doc 15881 Effect of mixed rare earth oxide coatings on high temperature oxidation of Fe-20Cr alloy2010 - FERNANDES, S.M.C.; CORREA, O.V.; RAMANATHAN, L.V.Artigo IPEN-doc 17571 Oxidation behaviour of rare earth oxide-coated De20Cr and Fe20CrAl alloys2011 - FERNANDES, STELA M.C.; CORREA, OLANDIR V.; RAMANATHAN, LALGUDI V.