Modifications of roughness and wettability properties of metals induced by femtosecond laser treatment |
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Authors: | P Bizi-BandokiS Benayoun S ValetteB Beaugiraud E Audouard |
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Institution: | a Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, 36 avenue Guy de Collongue, 69134 Ecully cedex, France b Laboratoire Hubert Curien, UMR CNRS 5516, 18 rue du Professeur Benoît Lauras, 42000 Saint-Etienne, France |
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Abstract: | Topographic and wetting properties of AISI 316L stainless steel and Ti-6Al-V alloys were modified via linearly polarized femtosecond laser pulse irradiation. In order to induce a gradual evolution of the surface topography and wettability, four samples of each alloy were irradiated with different number of pulses. From the topographic point of view, a multi-scale morphology made of nano- and micro-periodic ripples was induced. The increase in the number of pulses led to the appearance of a third scale structure of waviness that is due to the laser scanning. The wettability of alloys was changed from a hydrophilic behavior to a hydrophobic one without lowering surface energies by chemical coatings. The apparent contact angle (CA) increased with increasing the number of pulses. A rise of about 50° of the apparent CA of the Ti-6Al-V was noticed. |
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Keywords: | Femtosecond laser texturing Multi-scale surface structuration Surface topography Ripples Wettability Cassie-Baxter's model |
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