Ice accumulation on the front edge lip of the aircraft engine intake will seriously threaten aviation safety. Bionic research shows that a hydrophobic surface with a micro-nano structure has a desirable ice suppression effect. With the aircraft lip material TC4, a TC4 microstructure surface is prepared using femtosecond pulse laser induction. A three-dimensional topography and a scanning electron microscope are used to observe the three-dimensional topography and micro-nano structure of the TC4 alloy surface. Relying on the icing characteristics experimental system to test the ice and frost resistance performance of the microstructure surface, we analyze the influence mechanism of the femtosecond pulse laser processing technology parameters on the surface microstructure and frost suppression properties. The results show that with the increase of the laser scanning speed, the depth of the arched groove formed on the surface of the TC4 alloy increases, interference fringes and circular protrusions appear above the groove, and the size of the micro-nano protrusion increases with the increase of the scanning speed. The contact angle decreases first and then increases and finally decreases; after processing, the surface droplet freezing time is delayed by 30 s compared to the unprocessed surface; at the scanning speed of 2 000 mm/s, the droplet freezing time is the longest, the frost layer quality the smallest, and the height the lowest. The micro-nano structure formed on the surface of TC4 alloy by femtosecond laser processing and the organic matter adsorbed on the surface can change the surface contact angle, and the roughness and surface morphology can affect the surface freezing time and frost amount.
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