Investigation of the Effect of Residual Stress Gradient on the Wear Behavior of PVD Thin Films
Article dans une revue avec comité de lecture
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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Communication avec acteCr, 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 ...
Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique Article dans une revue avec comité de lectureTLILI, Brahim; MUSTAPHA, Nasri; BENLATRECHE, Yacine; GUILLEMOT, Gildas; LAMBERTIN, Michel; NOUVEAU, Corinne (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 ...
Influence of Substrate Bias Voltage on Corrosion and Wear Behavior of Physical Vapor Deposition CrN Coatings Article dans une revue avec comité de lectureAOUADI, Khalil; TLILI, Brahim; BESNARD, Aurélien; CHAFRA, Moez; SOULI, Rania; NOUVEAU, Corinne (Springer Verlag/ASM International, 2019)The objective of the present paper is to study the influence of the substrate bias voltage on the microstructure, composition, deposition rate, tribological and corrosion properties of CrN coatings obtained by DC magnetron ...
The Effect of Bilayer Periods and Their Thickness in Magnetron Sputtering Protective Multilayer Coatings for Tribological Applications Article dans une revue avec comité de lectureAOUADI, Khalil; BESNARD, Aurélien; TLILI, Brahim; MONTAGNE, Alex; CHAFRA, Moez; NOUVEAU, Corinne (Springer Science and Business Media LLC, 2021)CrN/CrAlN thin films were deposited by DC reactive magnetron sputtering. The influence of CrN/CrAlN bilayer thickness on the microstructure, mechanical, and tribological properties was studied. Crystallinity of the layers ...
Article dans une revue avec comité de lectureAOUADI, Khalil; BESNARD, Aurélien; TLILI, Brahim; MONTAGNE, Alex; CHAFRA, Moez; NOUVEAU, Corinne (Springer, 2021)CrAlN films were synthesized by DC reactive magnetron sputtering. The influence of the aluminium content on the microstructure, hardness and the friction coefficient of the CrAlN films have been investigated. Results ...