Elaboration et caractérisation de revêtements à base de nitrure de chrome, carbonitrure et carbure de titane élaborés par pulvérisation magnétron

Abstract : The objective of the present work is to deposit new protective coatings based on chromium nitride, titanium carbide and carbonitride by using physical vapor deposition in order to improve the dry wear resistance of wood cutting tools.Binary CrN, and MoN layers, ternary Cr–Mo–N and Ti-W-C films and quaternary Ti-W-C-N coatings were deposited on carbide inserts, iron cutting tools and silicon substrates by dual radio–frequency (RF) magnetron sputtering using different targets (Cr, Mo, Ti and WC) in different atmospheres (Ar, Ar+N2, Ar+CH4 and Ar+N2 +CH4).The influence of the working pressure, gas ratio, targets voltage, deposition temperature and heat temperature on the coating's properties has been studied by EDS, WDS, XPS, XRD, SEM, TEM, AFM, optical microscopy, 2D and 3D interferometric profilometer, Scratch test, Daimler test, nanoindentation, alternative and rotary tribometer. The objective is to correlate the tribological behavior of the studied coatings and their physico-chemical and mechanical properties.The coatings showing the best wear resistance against dry wear have been tested in industrial wood machining (-20/-25 °C). Results showed that Cr-Mo-N, Ti-W-C and Ti-W-C-N coating have improved the cutting tool's life from 47 to 77 % compared to uncoated one,Keywords: Coatings, (Cr-Mo)N, (Ti-W)(C,N), physico-chemical properties, mechanical properties, tribological behavior, wood machining
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Issam Rahil. Elaboration et caractérisation de revêtements à base de nitrure de chrome, carbonitrure et carbure de titane élaborés par pulvérisation magnétron. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0051⟩. ⟨pastel-00967251⟩

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