Traitements thermochimiques basse température assistés par plasmas d’un acier inoxydable austénitique pour la micro-structuration de surface d’un contact lubrifié

Abstract : Surface patterning can improve friction properties of a lubricated contact by the generation of hydrodynamic pressure. The objective of the ANR project MicroGaMe was to pattern the surface of a mechanical seal in austenitic stainless steel. We developed a process based on the use of low-temperature plasma-assisted thermochemical treatments (nitriding and carburizing). The study of the treated layers leads to a better understanding of its nature and of the formation mechanisms and also reveals the presence of nanoprecipitates. During the treatments, a deformation occurs in a direction perpendicular to the surface (called “swelling”) as a consequence of high internal stresses, which can be used as an original patterning driving force. To obtain a “positive” pattern, we treated samples through laser-cut steel plates. A “negative” motif (cavitie) requires the use of a discontinuous mask so we tested different deposition techniques. As the specific shape and dimensions needed for the application to a mechanical seal cannot be obtained with this approach, we also develop an ion etching process, which has been successfully applied to real size piece
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Aurore Andrieux. Traitements thermochimiques basse température assistés par plasmas d’un acier inoxydable austénitique pour la micro-structuration de surface d’un contact lubrifié. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0095⟩. ⟨tel-01751791⟩

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