Evolution of microstructure, mechanical and tribological properties of vanadium carbonitride coatings sputtered at different nitrogen partial pressures
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Titre | Evolution of microstructure, mechanical and tribological properties of vanadium carbonitride coatings sputtered at different nitrogen partial pressures |
Type de publication | Journal Article |
Year of Publication | 2019 |
Auteurs | Aissani L, Alhussein A, Nouveau C, Radjehi L, Lakdhar I, Zgheib E |
Journal | SURFACE & COATINGS TECHNOLOGY |
Volume | 374 |
Pagination | 531-540 |
Date Published | SEP 25 |
Type of Article | Article |
ISSN | 0257-8972 |
Mots-clés | Magnetron sputtering, Mechanical properties, Microstructure, Nitrogen pressure, V-C-N thin films, wear |
Résumé | Vanadium carbide coatings were deposited by R.F. reactive magnetron sputtering at different nitrogen partial pressures. The structures and the mechanical and tribological behaviour of these coatings were studied. By using a combined approach of EDS and WDS, it has been shown that increasing nitrogen concentration from 0 to 27 at.% led to decrease the carbon content from 48.50 to 30.50 at.%. All coatings exhibited a dominant fcc-VC structure with additional fractions of vanadium nitrides, as determined by XRD. Nanoindentation measurements showed that the highest hardness of 26.1 GPa was obtained for the coating with a (N + C) / (V) ratio equal to 1.44. The transition in brittleness-ductile failure mode was noticed with increasing nitrogen content. This adhesive feature can prevent phase separation and improves the wear resistance of the coatings. Moreover, the nitrogen partial pressure showed a significant influence on the friction coefficient because of film density and residual stress effects. |
DOI | 10.1016/j.surfcoat.2019.06.034 |