The paper deals with CrAlYN/CrAlYO multilayer coatings obtained by the plasma-assisted vacuum-arc deposition onto a WC–8Co alloy substrate. It is investigated how the layer number and thickness of 16- and 32-layer coatings with the thickness of ~240 and ~120 nm, respectively, affect the phase composition, crystal structure parameters, roughness, surface morphology, and physical and mechanical properties. The X-ray diffraction analysis shows that the obtained multilayer coatings have a multiphase structure consisting of nitride CrN and AlN and oxide Cr2O3 and AlYO3 phases. It is found that the roughness of the 32-layer CrAlYN/CrAlYO coating is almost 2 times lower than that of the 16-layer coating. It is shown that the larger number of layers and their lower thickness have a positive effect on physical and mechanical properties of the coatings. The hardness of the 32-layer coating increases by 52%. The synchrotron X-ray diffraction analysis of the 32-layer CrAlYN/CrAlYO coating shows its thermal stability up to ~1020°C during heating in air, while during heating in vacuum, its thermal stability keeps constant up to at least 1500°C.
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Leonov, A.A., Denisova, Y.A., Denisov, V.V. et al. Influence of Layer Number and Thickness of CrAlYN/CrAlYO Coatings on Phase Composition, Structure and Properties. Russ Phys J 66, 1102–1107 (2023). https://doi.org/10.1007/s11182-023-03049-1
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DOI: https://doi.org/10.1007/s11182-023-03049-1