Role of Y in the oxidation resistance of CrAlYN coatings

Domínguez-Meister, Santiago; Mrabet, Said El; Galindo, R. Escobar; Mariscal, Antonio Joaquín Franco; Haro, C. Jimenez de; Justo, A.; Brizuela, Marta; Rojas, T.C.; Sánchez-López, J.C.

doi:10.1016/j.apsusc.2015.06.099

Cited by 29 publications

(20 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the relevance of the iron out-diffusion decreases with the Y content, as previously reported in multilayered CrAlYN coating [26]. The best result is obtained for the intermediate value of 3.4 at.% of Y (cf.…”

Section: Oxidation Resistance and Thermal Stabilitysupporting

confidence: 74%

“…11c). On one hand, yttrium appears segregated forming grains at the interface what helps to improve the scale adhesion (by preventing fast growth of voids) and block iron out diffusion as highlighted in the literature and previous works [26,34].…”

Section: Oxidation Resistance and Thermal Stabilitymentioning

confidence: 84%

“…Nevertheless, at higher Y contents, the mobility of Cr ions is reduced in respect of Al according to the RE effect [26,30], favouring an enrichment of the oxide scale in Al.…”

Section: Oxidation Resistance and Thermal Stabilitymentioning

confidence: 99%

“…superlattice effect) as already proven with CrN-based multilayer systems like CrN/AlN [19][20], CrN/CrAlN [21], TiAlN/CrAlN [22] or TiAlSiN/CrAlN [23]. On the other hand, the incorporation of yttrium as a reactive element (RE) in CrAlN coatings, which reduces the oxide scale growth rate and increase the onset of decomposition to 1100ºC [24][25][26][27][28][29][30]. However, some discrepancies are found in the literature concerning the effect of the RE [31][32][33][34] and the optimum Y content [27,29,35], which seems to be dependent on the Al content, the film architecture and microstructure.…”

Section: Introductionmentioning

confidence: 98%

“…However, some discrepancies are found in the literature concerning the effect of the RE [31][32][33][34] and the optimum Y content [27,29,35], which seems to be dependent on the Al content, the film architecture and microstructure. These aspects as well as the influence of the substrate have been studied and revised in our previous publications with multi-layered CrAlYN coatings [25][26]36]. In this sense, in this work, we have prepared two series of CrAlYN coatings by cosputtering with two different Al contents: 16 at.% (set I) and 25 at.% (set II), and Y concentration varying between 1.2 and 5.7 at.%.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Rojas

Domínguez-Meister

Brizuela

et al. 2019

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

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) 2 O 3 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.

show abstract

Section: Oxidation Resistance and Thermal Stabilitysupporting

confidence: 74%

Section: Oxidation Resistance and Thermal Stabilitymentioning

confidence: 84%

“…Nevertheless, at higher Y contents, the mobility of Cr ions is reduced in respect of Al according to the RE effect [26,30], favouring an enrichment of the oxide scale in Al.…”

Section: Oxidation Resistance and Thermal Stabilitymentioning

confidence: 99%