CECÍLIO ALVARES DA CUNHA
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Artigo IPEN-doc 23482 High temperature erosion-oxidation resistance of thermally sprayed nanostructured Cr3C2-25(Ni-20Cr) coatings2017 - CUNHA, CECILIO A. da; CORREA, OLANDIR V.; SAYEG, ISAAC J.; RAMANATHAN, LALGUDI V.This study reports the high temperature erosion-oxidation (E-O) behavior of conventional and nanostructured Cr3C2-25(Ni-20Cr) coatings prepared by high velocity oxygen fuel (HVOF) spraying. As-received and nanostructured Cr3C2-25(Ni-20Cr) powders with mean crystallite sizes of 145 nm and 50 nm respectively, were used to prepare 120 - 200 μm thick coatings on AISI 310 samples. The E-O behavior of the coatings prepared with the as-received (AR) and nanostructured (NS) powders was determined as weight change in a custom designed rig at room temperature, 450, 700 and 800 ºC. The Vickers microhardness, Young’s Modulus and fracture toughness of the AR and NS coatings were determined, and the NS coatings exhibited higher values compared with the AR coatings. The E-O resistance of the NS coating was higher than that of AR coating at all temperatures, and particularly at 800 ºC. The increase in E-O resistance of the NS coatings is due to its superior mechanical properties as well as to the presence of some heterogeneities in the AR coatings. The E-O mechanisms of both types of the coatings are discussed, with special attention to that at high temperatures. The results suggest that at 800 ºC the E-O process is controlled by erosion of the oxide.Resumo IPEN-doc 19754 Nanostructured coatings to protect metallic materials at high temperatures2013 - FERNANDES, S.M.C.; PILLIS, M.F.; CUNHA, C.A.; CORREA, O.V.; RAMANATHAN, L.V.Resumo IPEN-doc 13320 Structure and properties of thermal sprayed nanostructured Cr3C2-25(Ni20Cr coatings2008 - PADIAL, A.; CUNHA, C.A.; BRESSIANI, A.H.; RAMANATHAN, L.V.Artigo IPEN-doc 12493 Effect of high energy milling parameters on nanostructured Cr3C2-Ni20Cr powder characteristics2007 - PADIAL, A.; CUNHA, C.A.; AMBROZIO FILHO, F.; BRESSIANI, A.H.A.; MARTINELLI, J.R.; LIMA, N.B. de; RAMANATHAN, L.V.Artigo IPEN-doc 15882 Thermal stability and erosin-oxidation behaviour of nanostructured Crsub(3)Csub(2)-Ni20Cr coatings2010 - PADIAL, A.; CUNHA, C.A.; CORREA, O.V.; RAMANATHAN, L.V.Artigo IPEN-doc 18563 Mechanical properties and erosion-oxidation resistance of thermally sprayed nanostructured Crsub(3)Csub(2)-25(Ni-20Cr) coatings2012 - CUNHA, C.A.; CORREA, O.V.; SAYEG, I.J.; LIMA, N.B. de; RAMANATHAN, L.V.Artigo IPEN-doc 18565 Preparation and properties of nanostructured WC-Co composite powders and coatings2012 - PADIAL, A.G.; CUNHA, C.A. da; CORREA, O.V.; LIMA, N.B.; RAMANATHAN, L.V.Artigo IPEN-doc 14778 Structure and properties of thermal sprayed nanostructured Crsub(3)Csub(2)-25(Ni20Cr) coatings2009 - PADIAL, A.; CUNHA, C.A.; LIMA, N.B.; MARTINELLI, J.R.; CORREA, O.V.; RAMANATHAN, L.V.