Study On Hydrophobicity And Delayed Icing Effect Of Copper Biomimetic Surface Textured By Laser

Inspired by the superhydrophobic properties of typical biological surfaces in nature,many methods for preparing superhydrophobic surfaces have been developed by researchers.In this paper,by observing and exploring the surface morphology of carp scales and other organisms in nature,a mathematical model was established,and the surface structure characteristics were analyzed,and the size effect and mechanism of surface microstructure characteristics on surface wettability were discussed.The closed-pore array surface with micro-micro composite structure and the fish-like scale surface with micro-nano composite structure were obtained on the surface of T2 copper by laser texture method.The wettability of two different textured surfaces was measured.The results showed that the prepared surfaces showed high static contact angle and low rolling angle without the modification of low surface energy materials.The contact angles of the obturator array surface and the fish-like surface were 157°±1.6° and 157°±0.8°,respectively.The polished surfaces with the closed-pores showed different adhesion properties under different array spacing sizes.The characterization results of surface roughness and X-ray energy spectrum show that the larger roughness and more surface oxide components make water droplets only contact with the convex surface,and the concave part forms air holes,which reduces the solid-liquid contact area and realizes the change of surface hydrophobicity.At the same time,the static water droplet freezing test was carried out in a low temperature cooling platform.the size effect and mechanism between the structure morphology of hydrophobic surface and the properties of delayed icing are discussed.The results show that the maximum time of delayed icing on the surface of a micro-micro composite structure with a closed-cell array is 20 times longer than that on the surface of a smooth copper substrate.and the maximum delayed icing time on the surface of the micro-nano composite structure with fish-like texture is 26 times that of the surface of a smooth copper substrate,which both show good delayed icing performance.