期刊
COATINGS
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/coatings11030369
关键词
femtosecond laser; laser texturing; wettability; superhydrophobicity; aluminum alloy; aerospace applications; optimization
资金
- Italian Ministry of Education, University and Research (MIUR) [PON AIM184902B-1-ATT1]
- Apulian Region within the Research in Innovation program [FEB1B50F]
Changing the wetting properties of surfaces has attracted great interest, especially in achieving superhydrophobic behavior. Laser machining can improve surface properties without chemical treatment, but is still too slow for industrial applications. By optimizing laser texture strategy, superhydrophobic aluminum alloy surfaces can be fabricated with a 10% reduction of processing time.
Changing the wetting properties of surfaces is attracting great interest in many fields, in particular to achieve a surface with a superhydrophobic behavior. Laser machining is an emerging technique to functionalize materials with high precision and flexibility without any chemical treatment. However, when it is necessary to treat large area surfaces laser-based methods are still too slow to be exploited in industrial productions. In this work, we show that by improving the laser texture strategy it is possible to reduce the laser processing time to produce superhydrophobic aluminum alloy surfaces. Three different surface texture geometries were micromachined; namely, square, circular and triangular lattice grooves. We found that if the spacing between the grooves is narrow, i.e., when the percentage of the textured surface is high, the volume of air trapped inside the micromachined structures plays an important role in the wetting behavior. Meanwhile, when the groove spacing approaches the droplet dimensions, the texture geometry has a preponderant influence. Based on these findings an appropriate choice of the laser texture strategy allowed the fabrication of superhydrophobic aluminum alloy surfaces with a 10% reduction of processing time.
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