Role of y in the oxidation resistance of CrAlYN coatings
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2015-10-30
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Abstract
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/N 2 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 Cr 2 N, and a more effective Fe and C blocking.
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Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.
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CrAlN , Magnetron sputtering , Mechanism , Oxidation resistance , Yttrium , CrAlN , Magnetron sputtering , Oxidation resistance , Mechanism , Yttrium , Condensed Matter Physics , Surfaces and Interfaces , Surfaces, Coatings and Films , Funding Info , MINECO: MAT2007-66881 MAT2010-21597 MAT2011-29074 Consolider FUNCOAT CSD2008-00023. _x000D_ Junta de Andalucia :TEP217. I3P programme of CSIC , MINECO: MAT2007-66881 MAT2010-21597 MAT2011-29074 Consolider FUNCOAT CSD2008-00023. _x000D_ Junta de Andalucia :TEP217. I3P programme of CSIC
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Domínguez-Meister , S , El Mrabet , S , Escobar-Galindo , R , Mariscal , A , Jiménez De Haro , M C , Justo , A , Brizuela , M , Rojas , T C & Sánchez-López , J C 2015 , ' Role of y in the oxidation resistance of CrAlYN coatings ' , Applied Surface Science , vol. 353 , pp. 504-511 . https://doi.org/10.1016/j.apsusc.2015.06.099