Experimental study on the ice suppression characteristics of TC4 microstructure surface induced by femtosecond pulsed laser

Abstract

The TC411Ti6Al4V alloy microstructure surface was prepared by using femtosecond pulse laser induction. The three-dimensional topography and scanning electron microscope were used to observe the TC4 alloy surface. Relying on the icing characteristics experimental system to test the ice and frost resistance performance of the microstructure surface, and analyze the influence mechanism of the femtosecond pulse laser processing technology parameters on the surface microstructure and frost suppression properties. The results show that the depth of the grooves on the surface of the TC4 alloy increases as the the laser scanning speed increase, the size of the micro/nano structure increases, the contact angle decreases first and then increases and then decreases; the freezing time of droplets on the machined surface is delayed by 30s than that on the untreated surface; the freezing time of droplets is the longest, the frost layer mass is the lowest and the height is the lowest when scanning speed is 2000 mm/s. 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; the roughness and surface morphology can affect the surface freezing time and frost amount.