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Indexed by:期刊论文

Date of Publication:2009-01-15

Journal:APPLIED SURFACE SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:255

Issue:7

Page Number:4020-4026

ISSN No.:0169-4332

Key Words:CrN/ZrN multilayers; Magnetron sputtering; Structure; Hardness; Tribological properties

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 < 111 > 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. Crown Copyright (C) 2008 Published by Elsevier B. V. All rights reserved.