Influence de l’oxydation des particules de poudres de tantale sur les propriétés des dépôts cold spray

Abstract : Cold gas dynamic process, namely Cold Spray, can be used to achieve fully-dense tantalum coatings onto a copper substrate due to spraying of powder particles at a high velocity. During spraying, the particles stay at the solid state, which prevents pollution and detrimental chemical modification such as oxidation. The risk for chemical damage therefore moves to other processing stages, primarily raw material production and powder storage. Tantalum is very sensitive to oxygen (for example, hardness increases even for low oxygen contents). In the present work, the consequences of the particle oxygen degree on coating quality are studied. Oxidized powder particles were analyzed using different methods (XRD, EPMA, TEM, XPS, nanoindentation, …) to characterize oxidation and particle mechanical properties. Particle impact phenomenology is studied from observation of splats, i.e. single deposited particles, and coatings. Analysis techniques and processes to describe splat deformation and adhesion are SEM, TEM, EBSD, modified scratch testing, laser structuring and LAser Shock Adhesion Test (LASAT®). In a final part, numerical simulation of coating build-up was developed using a mathematical morphology approach. Particle oxidation is involved in this simulation through the particle rebound phenomenon.
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Laure-Line Descurninges. Influence de l’oxydation des particules de poudres de tantale sur les propriétés des dépôts cold spray. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0073⟩. ⟨pastel-00976684⟩

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