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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 |
Authors: | Rojas, T. Cristina; Domínguez-Meister, Santiago ![]() ![]() |
Issue Date: | Sep-2018 |
Publisher: | Elsevier |
Citation: | Journal of Alloys and Compounds, 2018 |
Abstract: | CrAlYN 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 |
URI: | http://hdl.handle.net/10261/171494 |
DOI: | http://dx.doi.org/10.1016/j.jallcom.2018.09.280 |
Appears in Collections: | (ICMS) Artículos |
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JALCOM-D-18-08157R1 Germán.pdf | 1,54 MB | Adobe PDF | ![]() View/Open |
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