Hardness and scratch response of PVD multilayer coatings
Communication avec acte
In the present investigation, novel Cr/CrN, CrN/CrAlN and Cr/CrN/CrAlN multilayered coatings thin films have been developed by dual RF magnetron sputtering. They consist of superposing Cr, CrN and CrAlN layers of 50–500nm thick, up to a total thickness of 0.45–1μm. These coatings were grown on AISI4140 steel samples. The mechanical properties of these coatings were studied by scratch-tests and nano-indentation measurements. The hardness of the films reaches 15.8 GPa for a Cr/CrN multilayered coating sputtered at a bias voltage of -900V. High peak load tests were used to estimate the film adhesion on steel substrates; critical loads (Lc2) of 11N showed weak adhesion properties of the film. Moreover, an inventory of the major scratch-tests failure modes was established, which were classified into plastic deformation and different forms of cracking, spallation and coating perforation events. No evidence of interfacial failure(s) of the sub-layers was observed after the adhesion and nanoindentation tests.
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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; 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 ...
Experimental investigation of the mechanical micro structural and thermal properties of thin CrAIN layers deposited by PVD technique for various aluminum percentages Article dans une revue avec comité de lectureGHRIB, Taher; TLILI, Brahim; NOUVEAU, Corinne; BENLATRECHE, Yacine; LAMBERTIN, Michel; YACOUBI, Noureddine; ENNASRI, M. (Elsevier, 2009)The thin film of chromium nitride and their derivatives obtained by the filing process physical vapor deposition attract more and more attention from industry given their high resistance to wear. This quality of these ...
Article dans une revue avec comité de lectureTLILI, Brahim; NOUVEAU, Corinne; WALOCK, Michael J.; NASRI, Mustapha; GHRIB, Taher (Elsevier, 2012)Cr/CrN/CrAlN, CrN/CrAlN and Cr/CrN thin layers were deposited by PVD (Physical Vapor Deposition). The multilayers were obtained from the combined deposition of different layers Cr, CrN and CrAlN thick films on on AISI4140 ...
Article dans une revue avec comité de lectureTLILI, Brahim; NASRI, Mustapha; AYARI, F.; NOUVEAU, Corinne (2008)Nowadays, most surface treatments are realized through vapor deposition techniques as thin hard coatings to guarantee; high surface hardness, low friction coefficient and improve wear resistance. Several experimental ...
Etude des propriétés microstructurales, mécaniques, thermiques et de la porosité des couches minces de CrAlN déposées par PVD sous différents pourcentages d’aluminium Communication avec acteTLILI, 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 ...