Étude du comportement tribologique de revêtements diamants obtenus par procédé flamme

Abstract : Results obtained during these three years of PhD deal with the tribological behaviour of diamond coatings obtained by flame process, and its variations with various parameters : the nature of the counterface, the environment, the applied normalload, the crystals orientation. A preliminary study led to the following conclusions: the scratch due to the diamonds tips motion appeared even at low load ; a graphitisation phenomenon happened at high load under oxygen ; the superficial tension forces played an important part under water vapour at low load. It was also shown that the measured friction coefficient is not typical of the real diamond behaviour, but rather characterised the (diamond + transfer) / (disc + wear debris) couple. The influence of the crystals orientation was then studied, highlighting thus the following phenomena : the preferential transfers from the disc to the pin; the different kind of indentations under oxygen ; the way the coatings are modified during the sliding : crystals deterioration, Sp3 -> Sp2 transformation. A study concerning the diamond/aluminuim alloys couples was then begun, dealing more particularly with the role of the oxides on the cutting process and the nature of the transfer. A simulation of the diamond coated pin-disc contact was finally realized : this modelling allowed the evaluation of the critical load avoiding the diamond-substrate decohesion, which is particularly important for the coated cutting tools.
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Marjorie Schmitt. Étude du comportement tribologique de revêtements diamants obtenus par procédé flamme. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2000. Français. ⟨NNT : 2000INPL127N⟩. ⟨tel-01750503⟩

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