Study on antireflection of titanium alloy based on different filling intervals of nanosecond laser

Antireflection functional surface has important applications in photoelectric detection, artificial blackbody, infrared imaging and other fields. In this study, the titanium alloy surface with high absorptivity was fabricated by nanosecond laser system. The effects of different scanning filling intervals on microstructure morphology and reflectance were studied. With the decrease of scanning interval, there are more and more micro clusters and micro holes on the surface, and the reflectance decreases gradually. When the scanning filling interval was reduced to 0.01 mm, the reflectance of titanium alloy surface could be decreased by 3% in the wavelength range of 400–1000 nm after laser treatment. In addition, in order to obtain a composite functional surface with superhydrophobic properties, the laser-processed surface was modified with a mixed solution of
$1 H,\ 1 H,\ 2 H,\ 2 H$
-perfluorodecyltriethoxysilane and methanol. The maximum contact angle is 153.8° when the laser filling interval was 0.01 mm. It provides a reference for the preparation of antireflection and superhydrophobic composite functions surface.