Product Code: ICAL09_C205

Ultra Short Pulse Laser Generated Surface Textures for Anti-Ice Applications in Aviation
Authors:
Gert-willem Romer, University of Twente; Enschede Netherlands
Daniel Arnaldo Del Cerro, University of Twente; Enschede Netherlands
R.C.J. Sipkema, Lightmotif B.V.; Enschede` Netherlands
M.N.W. Groenendijk, Lightmotif B.V.; Enschede Netherlands
A.J. Huis in 't Veld, University of Twente; Enschede Netherlands
Presented at ICALEO 2009

By laser ablation with ultra short laser pulses in the pico- and femto-second range, well controlled superimposed micro- and nano-scaled surface textures can be obtained. The micro-scale of the texture is mainly determined by the dimensions of the laser spot, whereas the superimposed nano-structure is the result of so-called laser induced self organizing nano-structuring. By controlling this micro-nano surface texture, it is possible to modify the natural hydrophobicity of materials. This paper investigates the anti-ice properties of these hydrophobic micro-nano surface textures. Leading edges, engine inlets etc. of airplanes are prone to ice-accretion in certain icing conditions. Ice can distort the flow of air over the wing, reducing the aircrafts aerodynamic performance. Moreover, take-off is not permitted if ice contamination on the aircraft's surfaces exists. Two materials, popular in aviation, Ti6Al4V and stainless steel 1.4544.9, were laser-machined using UV laser pulses of 7 ps at 200kHz. Surface textures were analyzed using optical microscopy and SEM. Coatings, on top of the textures, were applied to create super- hydrophobicity. The hydrophobicity of the surfaces was quantified by contact angle measurements. The anti-ice properties of the surfaces were tested in a climate chamber.