Study On Ice Suppression Characteristics Of Micro Nano Structure Surface Induced By Short Pulse Width Laser

In the aviation field,aircraft icing will not only cause a great economic burden,but more importantly,it will pose a serious threat to flight safety.Studies have shown that the surface of the hydrophobic material has a good ice suppression effect,and the surface microstructure of the construction material can achieve surface hydrophobicity.The laser processing induced microstructure surface stands out among many microstructure preparation technologies due to its high processing efficiency and simple method.The use of laser-induced titanium alloys to prepare periodic micro-nano structures to solve the problem of aircraft icing has become an important direction of current research.This article first uses laser processing technology(including femtosecond laser and nanosecond laser)to laser process the surface of titanium alloy,and then let it stand in the air for a period of time.From the three-dimensional morphology,surface roughness and microstructure system,the surface morphology of the titanium alloy under different scanning speeds and repetition frequencies is characterized.Focus on exploring the influence of laser processing parameters on the morphology and size changes of titanium alloy microstructures,provide a theoretical basis for subsequent infiltration analysis.Secondly,the surface wettability of the titanium alloy under different processing parameters was tested and analyzed,and the influence of different processing parameters on the surface wettability of the processed titanium alloy was studied.The experimental results show that: The larger the laser scanning speed,the smaller the spot overlap rate,the weaker the cumulative effect of the laser,and the smaller the surface roughness;the larger the laser repetition frequency,the smaller the pulse energy density,the weaker the ablation effect of the material,and the smaller the surface roughness.The surface contact angle of femtosecond laser processing increases first and then decreases with the increase of scanning speed.The surface contact angle of nanosecond laser processing decreases with the increase of scanning speed and repetition frequency.Finally,the ice suppression and frost suppression performance of different surfaces are evaluated,and the ice suppression and frost suppression effects of the material surface are analyzed from the freezing time,freezing rate,frost height,coverage and quality of the material surface.The results show that: in the femtosecond laser experiment,the surface of titanium alloy with a scanning speed of 2000 mm/s has the best ice and frost suppression effect;In the nanosecond laser experiment,the surface of titanium alloy with a scanning speed of 750 mm/s and a repetition frequency of 50 k Hz has the best ice and frost suppression effect.