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Role of Y in the oxidation resistance of CrAlYN coatings

AuthorsDomínguez-Meister, Santiago ; El Mrabet, R.; Escobar Galindo, R.; Mariscal, A. ; Jiménez de Haro, María del Carmen ; Brizuela, Marta; Rojas, T. Cristina; Sánchez-López, J.C.
Magnetron sputtering
Oxidation resistance
Issue Date2015
CitationApplied Surface Science, 353: 504-513 (2015)
AbstractCrAlYN 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.
Publisher version (URL)http://dx.doi.org/10.1016/j.apsusc.2015.06.099
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