Investigation of the Effect of Residual Stress Gradient on the Wear Behavior of PVD Thin Films
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The control of residual stresses has been seldom investigated in multilayer coatings dedicated to improvement of wear behavior. Here, we report the preparation and characterization of superposed structures composed of Cr, CrN and CrAlN layers. Nano-multilayers CrN/CrAlN and Cr/CrN/CrAlN were deposited by Physical Vapor Deposition (PVD) onto Si (100) and AISI4140 steel substrates. The Cr, CrN and CrAlN monolayers were developed with an innovative approach in PVD coatings technologies corresponding to deposition with different residual stresses levels. Composition and wear tracks morphologies of the coatings were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, atomic force microscopy, x-ray photoelectron spectroscopy, energy-dispersive x-ray spectroscopy, x-ray diffraction and 3D-surface analyzer. The mechanical properties (hardness, residual stresses and wear) were investigated by nanoindentation, interferometry and micro-tribometry (fretting-wear tests). Observations suggest that multilayer coatings are composed mostly of nanocrystalline. The residual stresses level in the films has practically affected all the physicochemical and mechanical properties as well as the wear behavior. Consequently, it is demonstrated that the coating containing moderate stresses has a better wear behavior compared to the coating developed with higher residual stresses. The friction contact between coated samples and alumina balls shows also a large variety of wear mechanisms. In particular, the abrasive wear of the coatings was a combination of plastic deformation, fine microcracking and microspallation. The application of these multilayers will be wood machining of green wood.
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Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique TLILI, Brahim; MUSTAPHA, Nasri; NOUVEAU, Corinne; BENLATRECHE, Yacine; GUILLEMOT, Gildas; LAMBERTIN, Michel (Elsevier, 2010)The CrAlN coatings are a good alternative to conventional CrN coatings especially for high temperature oxidation-resistance applications. Different CrAlN coatings were deposited on silicon (100) by PVD (Physical vapor ...
TLILI, Brahim; NOUVEAU, Corinne; GUILLEMOT, Gildas (American Institute of Physics, 2010)Cr, CrN and CrAlN monolayers were synthesized by RF dual magnetron sputtering on AISI4140 steel and silicon substrates at 200°C. Multilayers coatings based on the three mono-layers such as CrN/CrAlN and Cr/CrN/CrAlN were ...
Effect of substrate bias voltage on the microstructure and tribological properties of CrN coatings AOUADI, Khalil; NOUVEAU, Corinne; BESNARD, Aurélien; TLILI, Brahim; CHAFRA, Moez (Lavoisier, 2016)Microstructure, wear and friction coefficient of cr-based magnetron sputtered layers. CrN films were deposited on stainless steel and silicon substrates via magnetron reactive sputtering under a systematic variation of the ...
BRAYEK, A.; TLILI, Brahim; GHRIB, Taher; NOUVEAU, Corinne (EDP Sciences, 2012)In this work we present the technique of magnetron vapor deposition and the effect of several deposition parameters on the structural and morphological properties of prepared thin films. It was noted that the deposition ...
Etude des propriétés microstructurales, mécaniques, thermiques et de la porosité des couches minces de CrAlN déposées par PVD sous différents pourcentages d’aluminium TLILI, Brahim; BENLATRECHE, Yacine; GHRIB, Taher; NOUVEAU, Corinne (Société Tunisienne de Physique (S.T.P), 2008)Several experimental investigations have led to the development of CrAlN (Chrome Aluminum Nitride) hard coatings by varying the aluminum target bias voltage, in preference to the traditional CrN coating. The present work ...