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Evolution of microstructure, mechanical and tribological properties of vanadium carbonitride coatings sputtered at different nitrogen partial pressures

Type
Articles dans des revues avec comité de lecture
Author
AISSANI, Linda
357682 Badji Mokhtar-Annaba University
421622 Universite Abbes Laghrour [Khenchela]
ALHUSSEIN, Akram
1685 Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée [LASMIS]
93484 Université de Technologie de Troyes [UTT]
NOUVEAU, Corinne
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
RADJEHI, Lamia
421622 Universite Abbes Laghrour [Khenchela]
LAKDHAR, Issam
1685 Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée [LASMIS]
93484 Université de Technologie de Troyes [UTT]
ZGHEIB, Elia
1685 Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée [LASMIS]
93484 Université de Technologie de Troyes [UTT]

URI
http://hdl.handle.net/10985/19686
DOI
10.1016/j.surfcoat.2019.06.034
Date
2019
Journal
Surface and Coatings Technology

Abstract

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.

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