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Structuration multi-échelle d'alliages métalliques au moyen d'un laser Femtoseconde

Abstract : Many industrial applications highlight the importance of the wetting properties of metallic surfaces related to their adhesion phenomena. Wenzel's (1936) and Cassie - Baxter's (1944) independent works showed that the wettability depended on both the surface tension of the solid but also on its surface topography. Thus the control and optimization of these properties require control of both aspects, like the lotus leaf whose superhydrophobic character lies in the presence of a hydrophobic wax and a multi-scale roughness. These observations are at the origin of the development of chemical etching techniques to produce surface texturing of materials and control their wettability. To overcome some limitations of these techniques and focus on a dry process, we considered the surface texturing of metal alloys of titanium, aluminum, and various stainless steels, using a femtosecond laser surface treatment. The analysis of the topography of the textured surfaces using different techniques (optical profilometry, AFM, SEM) showed the effectiveness of this method for generating multi-scale texturing. The different morphologies of textures can be associated with regimes transitions in the laser - matter interaction (ripples,spikes ...). The chemical and structural analysis (XRD, XPS) of the treated surfaces revealed microstructural changes due to thermal effects of laser, and a shift in the chemical state of the surface whose effects on the wettability are important. The hydrophobicity of metallic surfaces was significantly enhanced by laser treatment. These results may be used for various industrial applications, including the control of the surface state of plastic molds.
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Submitted on : Wednesday, November 28, 2012 - 4:47:38 PM
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Pavel Bizi Bandoki. Structuration multi-échelle d'alliages métalliques au moyen d'un laser Femtoseconde. Autre. Ecole Centrale de Lyon, 2012. Français. ⟨NNT : 2012ECDL0011⟩. ⟨tel-00758413⟩

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