Etude physicochimique multi-échelle des interfaces pour la compréhension de l'adhérence d'un dépôt par projection thermique de poudres submicroniques

Abstract : As part of the Suspension Plasma Spraying process (SPS), this study aims at a better understanding of the impact behavior of sub-micrometric droplets. Using a dimensionless approach, the governing mechanisms of splat formation are studied. This approach is based on the velocity decrease of the micrometric droplet (40 µm), in order to be closer to sub-micrometric particle impact conditions. A specific test bench is used to study the dynamic flattening of micrometric droplets. This work includes - an experimental study of the impact of single droplets on a substrate, - a dimensionless approach to compare flattening behaviors of micrometric and sub-micrometric droplets - a study of splat morphology related to the substrate roughness. The results allow to define the substrate roughness for maximum splat flattening for both measuring scales, and to prevent the formation of any defects at the coating / substrate interface.
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Guillaume Bidron. Etude physicochimique multi-échelle des interfaces pour la compréhension de l'adhérence d'un dépôt par projection thermique de poudres submicroniques. Autre. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0036⟩. ⟨tel-01127443⟩

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