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Influence of film thickness and Ar N2 plasma gas on the structure and performance of sputtered vanadium nitride coatings

Type
Articles dans des revues avec comité de lecture
Author
AISSANI, Linda
301037 Université Larbi-Ben-Mhidi [Oum-El-Bouaghi] [OEB]
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]
GHELANI, Laala
421622 Universite Abbes Laghrour [Khenchela]
ZAABAT, Mourad
301037 Université Larbi-Ben-Mhidi [Oum-El-Bouaghi] [OEB]

URI
http://hdl.handle.net/10985/19683
DOI
10.1016/j.surfcoat.2019.124948
Date
2019
Journal
Surface and Coatings Technology

Abstract

We investigated the effect of film thickness on the structure and properties of VN coatings deposited by magnetron sputtering in an argon and nitrogen atmosphere. The nitrogen percentage was changed between 10 and 20%. Firstly, structural and morphological properties of VN films were observed, analyzed and subsequently followed by a detailed investigation on the mechanical and tribological properties of these coatings. It has been shown that film structure, hardness and wear resistance significantly changed with varying the film thickness and the nitrogen percentage. In the case of films deposited under 10%N2, the presence of V2N phase was evident. With increasing nitrogen ratio in the deposition chamber from 10 to 20%, the structure was changed from (hc)V2N to multi phases of V2N and (fcc) VN (formation of different vanadium nitrides). The thick films containing more nitrogen were slightly dense compared to the thinner ones presenting rough surface and columnar morphology. Nanoindentation measurements showed that film mechanical behavior depends on its thickness, nitrogen percentage and microstructural features. The film hardness first increased with its thickness and then decreased. The highest hardness of 26.2 GPa was obtained for the film deposited under 20%N2, which is correlated with its dense structure and film stoichiometry. The film thickness has a significant effect on the tribological properties of VN films. The minimum friction coefficient of 0.4 was found for the thickest film of 2500 nm. The wear rate gradually decreased with increasing the film thickness, due to the high hardness, presence of VN phase and the strong adhesion between film and substrate.

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