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 ...
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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 ...
Comparison of CrAlN layers obtained with one (CrAl) or two targets (Cr and Al) by magnetron sputtering Article dans une revue avec comité de lectureNOUVEAU, Corinne; TLILI, Brahim; AKNOUCHE, Hamid; BENLATRECHE, Yacine; PATEL, Bhavesh (Elsevier, 2012)The aim of this study is to compare the properties of CrAlN coatings obtained by magnetron sputtering with one (CrAl) or two targets (Cr and Al). The influence of parameters such as the target bias voltage, the working ...