Artículo
Role of Y in the oxidation resistance of CrAlYN coatings
Autor/es | Sánchez López, Juan Carlos
Rojas Ruiz, Teresa Cristina Brizuela, Marta Justo, A. Jiménez de Haro, María del Carmen Mariscal, Antonio Escobar-Galindo, Ramón El Mrabet, Said Domínguez Meister, Santiago |
Fecha de publicación | 2015 |
Fecha de depósito | 2018-04-10 |
Publicado en |
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Resumen | CrAlYN coatings with different aluminum (4–12 at.%) and yttrium (2–5 at.%) contents are deposited by d.c. reactive magnetron sputtering on silicon and M2 steel substrates using metallic targets and Ar/N2 mixtures. The ... CrAlYN coatings with different aluminum (4–12 at.%) and yttrium (2–5 at.%) contents are deposited by d.c. reactive magnetron sputtering on silicon and M2 steel substrates using metallic targets and Ar/N2 mixtures. The influence of the nanostructure and chemical elemental distribution on the oxidation resistance after heating in air at 1000 °C is studied by means of cross-sectional scanning electron microscopy (X-SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GD-OES). The sequential exposure to the metallic targets during the synthesis leads to a multilayer structure where concentration of metallic elements (Cr, Al and Y) is changing periodically. A good oxidation resistance is observed when Al- and Y-rich regions are separated by well-defined CrN layers, maintaining crystalline coherence along the columnar structure. This protective behavior is independent of the type of substrate and corresponds to the formation of a thin mixed (Al, Cr)-oxide scale that protects the film underneath. The GD-OES and XRD analysis have demonstrated that Y acts as a reactive element, blocking the Fe and C atoms diffusion from the steel and favoring higher Al/Cr ratio in the passivation layer after heating. The coating with Y content around 4 at.% exhibited the best performance with a thinner oxide scale, a delay in the CrN decomposition and transformation to Cr2N, and a more effective Fe and C blocking. |
Identificador del proyecto | TEP217
CSD2008-00023 MAT2007-66881 MAT2010-21597 MAT2011-29074 |
Cita | Sánchez López, J.C., Rojas Ruiz, T.C., Brizuela, M., Justo, A., Jiménez de Haro, M.C., Mariscal, A.,...,Domínguez Meister, S. (2015). Role of Y in the oxidation resistance of CrAlYN coatings. Applied Surface Science, 353, 504-513. |
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