Etude expérimentale et numérique de l'adhérence d'un dépôt diamant CVD sur un substrat carbure de tungstène : application à l'usinage

Abstract : Coatings, and particularly Chemical Vapor Deposited (CVD) diamond coatings, are promising regarding hard to machine materials and some applications are already ready industrially. The excellent thermo-mechanical properties of diamond impose this solution to the machining of non-ferrous materials. However, the coated tools are difficult to understand. As a substrate-coating system, the tool is itself a composite material, bringing some difficulties. Edge preparation technologies are various: it is difficult to identify the optimal process. It has also to be noticed that the tool-piece interaction in machining operations is not completely understood yet, and that an intense research work is done to understand these phenomena. The thermo-mechanical loading on the coating is difficult to determine, and the developments on the coatings needs experimental data which are cost and time consuming.In this work, we will show the interest and improvement brought by such a coating in comparison to other coatings used in machining. Then, the stress state of the system carbide – coating is study by the mean of numerical and analytical models, as well as by the mean of experimental measurements.The influences of the different configurations of the geometry and of the deposition process on the residual stresses into the layer are studied. These high stresses have a direct impact on the adhesion of the layer, which will be discussed and measured experimentally into the second part of our work. To study the adhesion phenomena deeply, an experimental device has been designed. The obtained results are detailed and discussed. With these data, the Energy release rate of the interface is calculated and proposed as an adhesion criterion at the end of this work
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David Moulin. Etude expérimentale et numérique de l'adhérence d'un dépôt diamant CVD sur un substrat carbure de tungstène : application à l'usinage. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ058S⟩. ⟨tel-01751344⟩

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