RT Journal Article
T1 Influence of Al and Y content on the oxidation resistance of CrAlYN protective coatings for high temperature applications: 												New insights about the Y role
A1 Rojas, T. C.
A1 Domínguez-Meister, S.
A1 Brizuela, M.
A1 Sánchez-López, J. C.
AB 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 °C 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 1000 °C. 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.
SN 0925-8388
YR 2019
FD 2019-01-30
LK https://hdl.handle.net/11556/4191
UL https://hdl.handle.net/11556/4191
LA eng
NO Rojas , T C , Domínguez-Meister , S , Brizuela , M & Sánchez-López , J C 2019 , ' Influence of Al and Y content on the oxidation resistance of CrAlYN protective coatings for high temperature applications : New insights about the Y role ' , Journal of Alloys and Compounds , vol. 773 , pp. 1172-1181 . https://doi.org/10.1016/j.jallcom.2018.09.280
NO Publisher Copyright: © 2018 Elsevier B.V.
NO European Regional Development Funds program (EU-FEDER) and Spanish Ministry of Economy, Industry and Competitiveness (projects n° MAT2015-65539-P and MAT2015-69035-REDC), and CSIC (201560E013) are acknowledged for financial support. The lamellae preparation was conducted in the ‘Laboratorio de Microscopias Avanzadas’ at ‘Instituto de Nanociencia de Aragón-Universidad de Zaragoza’. Authors acknowledge the LMA-INA for offering access to their instruments and expertise. European Regional Development Funds program ( EU-FEDER ) and Spanish Ministry of Economy, Industry and Competitiveness (projects n° MAT2015-65539-P and MAT2015-69035-REDC ), and CSIC ( 201560E013 ) are acknowledged for financial support. The lamellae preparation was conducted in the ‘Laboratorio de Microscopias Avanzadas’ at ‘Instituto de Nanociencia de Aragón-Universidad de Zaragoza’. Authors acknowledge the LMA-INA for offering access to their instruments and expertise.
DS TECNALIA Publications
RD 31 jul 2024