Abstract
In the last years the scientific interest for transition metal compounds, used for protective and functional coatings, was extended and included, besides Ti, other elements such as Zr, V, and Hf as potential candidates. Due to their promising mechanical properties, and resistance to high temperature, V compounds received an increasing attention from scientists and end-users.The present work is dedicated to the study of the characteristics and the properties of the vanadium based multilayer hard coatings deposited by a magnetron sputtering process, assisted by a high voltage pulse discharge. Different multilayer coatings (VC/VN, VN/VC, VN/VCN/VC) were obtained and comparatively analyzed relative to vanadium nitride and vanadium carbide monolayers. Coatings with microhardness up to 3700HV 0.05 and thickness up to 20μm have been produced.Elemental and phase composition, as well as tribological characteristics (wear factor and friction coefficient) of the coatings were investigated. The chemical and structural investigations were performed by GDOES (Glow Discharge Optical Emission Spectrometry), EDX (Energy Dispersive X-ray analysis), XRD (X-ray Diffraction) and SEM (Scanning Electron Microscopy), while microhardness measurements and wear test were used to assess the coatings characteristics. The friction coefficient and the wear resistance of the coatings were evaluated by using pin on disc tests in unlubricated conditions.
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