Microstructures and tribological properties of CrN/ZrN nanoscale multilayer coatings |
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Authors: | ZG Zhang O Rapaud D Mercs C Dong |
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Institution: | a State Key Laboratory of Materials Modification, Dalian University of Technology, Dalian 116024, China b LERMPS, Université de Technologie de Belfort-Montbéliard (UTBM), Site de Montbéliard, F-90010 Belfort Cedex, France |
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Abstract: | Nanoscale multilayer CrN/ZrN coatings with bilayer thicknesses ranging from 11.7 to 66.7 nm were prepared by reactive magnetron sputtering techniques. The structure of the thin films was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray diffraction results showed that CrN individual layers presented a <1 1 1> preferred orientation in the multilayer coatings. The diffraction peaks of CrN shifted continuously to low diffraction angle with decreasing bilayer thickness. TEM observations showed that the multilayer did not form a superlattice structure instead of the coexistence of nanocrystalline CrN and ZrN layers. Columnar growth for all the coatings was observed by cross-sectional SEM. Nanoindentation tests showed that the multilayer coatings had almost a constant nanohardness of 29 GPa in spite of the variations of bilayer thickness. Pin-on-disk tests indicated that both the friction coefficients and wear rates increased when decreasing bilayer thickness. However, in comparison with the monolayer coating, the multilayer coatings exhibited excellent wear resistance. |
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Keywords: | CrN/ZrN multilayers Magnetron sputtering Structure Hardness Tribological properties |
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