Journal
SURFACE & COATINGS TECHNOLOGY
Volume 167, Issue 1, Pages 25-32Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0257-8972(02)00885-X
Keywords
tribological properties; hard-lubricating coatings; composite coatings
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A CrN/MoS2 (Ti) coating was developed in order to improve the tribological characteristics of single CrN coatings as a possible alternative for high wear low friction applications. The MoS2 (Ti) coating was produced by PVD closed-field unbalanced magnetron sputtering on CrN coated stainless steel substrates. The tribological performance of both, the single CrN coating and the CrN/MoS2 (Ti) coating was evaluated and compared. Characterization of the coatings included: scratch testing, wear testing, nanoindentation, X-ray diffraction, optical and scanning electron microscopy. The CrN coating exhibited excellent adhesion, hardness and stiffness. However, adding the MoS2 (Ti) layer led to a significant improvement in the tribological properties, while maintaining the good adhesion characteristics of the underlying CrN layer. A maximum wear volume and coefficient of friction reduction of 95% was observed. Surface roughness of the coatings did not play a major role on the tribological properties. The results of this work provide with enough evidence to consider the CrN/MoS2 (Ti) coating as a promising alternative for high wear low friction applications. (C) 2002 Elsevier Science B.V. All rights reserved.
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