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Fabrication of multi-scale periodic surface structures on Ti-6Al-4V by direct laser writing and direct laser interference patterning for modified wettability applications

 
: Huerta-Murillo, D.; Aguilar Morales, Alfredo Ismael; Alamri, Sabri; Cardoso, J.T.; Jagdheesh, R.; Lasagni, Andrés-Fabián; Ocaña, José L.

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Optics and Lasers in Engineering 98 (2017), pp.134-142
ISSN: 0143-8166
Deutsche Forschungsgemeinschaft DFG
675063; Laser4FUN
English
Journal Article
Fraunhofer IWS ()
laser material processing; Ti-6Al-4V; laser direct writing; direct laser interference patterning; laser induced periodic surface structures

Abstract
In this work, hierarchical surface patterns fabricated on Ti-6Al-4V alloy combining two laser micro-machining techniques are presented. The used technologies are based on nanosecond Direct Laser Writing and picosecond Direct Laser Interference Patterning. Squared shape micro-cells with different hatch distances were produced by Direct Laser Writing with depths values in the micro-scale, forming a well-defined closed packet. Subsequently, cross-like periodic patterns were fabricated by means of Direct Laser Interference Patterning using a two-beam configuration, generating a dual-scale periodic surface structure in both micro- and nano-scale due to the formation of Laser-Induced Periodic Surface Structure after the picosecond process. As a result a triple hierarchical periodic surface structure was generated. The surface morphology of the irradiated area was characterized with scanning electron microscopy and confocal microscopy. Additionally, static contact angle measurements were made to analyze the wettability behavior of the structures, showing a hydrophobic behavior for the hierarchical structures.

: http://publica.fraunhofer.de/documents/N-456151.html