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Title

Influence of Al and Y content on the oxidation resistance of CrAlYN protective coatings for high temperature applications: New insights about the Y role

AuthorsRojas, T. Cristina; Domínguez-Meister, Santiago ; Brizuela, Marta; Sánchez-López, J.C.
Issue DateSep-2018
PublisherElsevier
CitationJournal of Alloys and Compounds, 2018
AbstractCrAlYN hard coatings with two different average Al contents: 16 at.% and 25 at.%, and Y concentration varying between 1.2 and 5.7 at.% were deposited by direct current reactive magnetron co-sputtering of mixed Cr-Al and Y targets on commercial M2 steel substrates. The samples were heated to 1000 ºC in air during 2 h to study their oxidation resistance and thermal stability. The Y content is critical and the coatings present different behaviour depending on the Al content. The best oxidation resistance and thermal stability are obtained for the coating with 16 at.% Al and 3.4 at.% Y. The initial film microstructure and the cubic phase (fcc-CrAlN) were retained, and a thin (Cr,Al)2O3 oxide protective scale was formed. At lower Y content (1.2 at.%) iron from the substrate crosses the coating, while a higher content (4.6 at.%) avoided the iron diffusion at the expense of a thicker oxide scale with new oxide phases. The coatings with higher Al content (~25 at. %) were not thermally stable at 1000ºC. A good oxidation resistance was obtained for 2.6 at.% of Y although new phases (hcp-AlN and Cr-Fe) were formed. Higher amount of yttrium (5.7 at. %) led to the complete oxidation of the coating.
Publisher version (URL)http://dx.doi.org/10.1016/j.jallcom.2018.09.280
URIhttp://hdl.handle.net/10261/171494
DOI10.1016/j.jallcom.2018.09.280
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