Nanosecond laser ablation has gained considerable attention to manufacturing surface micro-textures due to its fast speed, high efficiency, ease of control, and environmentally friendly nature. However, large amounts of molten materials were observed on the laser micro-textured surface ascribed to the heat-affected zone induced by thermal diffusion. In the present paper, a novel fabrication approach employing supplementary materials to enhance the machining quality of nanosecond laser ablation was put forward. The effect of low-melting alloy coating thickness on the processing quality of micro-textures fabricated by nanosecond laser ablation using low-melting alloy coatings was investigated. The surface topographies and surface roughness parameters of micro-textures fabricated by nanosecond laser ablation under air and low-melting alloy coating were characterized by SEM and LSCM. The nanosecond laser ablation experimental results demonstrated that the bulges and burrs could be significantly reduced through the low-melting alloy coating compared with that manufactured in air. Almost no bulges were observed around the rectangle micro-textures manufactured by nanosecond laser ablation using low-melting alloy coating with the film thickness of 0.2 mm. Moreover, the tribological and lubricating performance of micro-textured H62 brass fabricated by nanosecond laser ablation under air and low-melting alloy coatings were experimentally researched. The lower friction coefficients were observed on semi-circle, rectangle, and circle micro-textured samples fabricated by nanosecond laser ablation with the low-melting alloy coating thickness of 0.2 mm compared with those manufactured by nanosecond laser ablation under air.
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