Geometry-Driven Asymmetric Tribological Response in Laser-Patterned Cu Surfaces

Abstract This study investigates the fabrication of anisotropic saw-tooth topographies on copper surfaces using direct laser interference patterning (DLIP). By varying the structural periodicity (2, 7.5, and 10 µm) and manufacturing inclination angles (15, 30, and 45°), this work assesses the impact of periodic, deterministic surface topography on tribological performance. Linear reciprocating sliding tests against a hard ceramic counterbody demonstrated that these laser-patterned structures can