研究目的
Investigating the interaction of a nanosecond pulsed Nd3+:YAG laser operating at different wavelengths (1064 nm, 532 nm, and 355 nm) with moly-chrome film to analyze the geometrical parameters of grooves and dimples, the roughness inside the grooves, and the optical reflectivity of the material.
研究成果
The laser wavelength of 1064 nm showed high material removal and recast layer formation in both grooves and dimples, with increased roughness inside the grooves. The wavelength of 532 nm offered low material removal and recast layer with low surface roughness. The study provides insights into the effects of different laser wavelengths on the surface processing of moly-chrome film.
研究不足
The study is limited to the analysis of geometrical parameters and roughness inside the grooves and dimples formed by laser ablation. Further studies are needed to understand the absorption coefficient and residual stress induced on the laser textured surface formed with different wavelengths.
1：Experimental Design and Method Selection:
A nanosecond pulsed Nd3+:YAG laser with pulse duration of 6 ns and pulse repetition rate of 10 Hz was used to produce groove and dimple textures on the moly-chrome film. Various laser parameters were employed to investigate the interaction at different wavelengths.
2：Sample Selection and Data Sources:
The target material was a commercially available piston ring made from spheroidal graphite cast iron with a moly-chrome thin film coating.
3：List of Experimental Equipment and Materials:
Equipment included a nanosecond pulsed Nd3+:YAG laser, optical surface profiler (Bruker, Contour GT), and scanning electron microscopy (FEI, Quanta 200).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Grooves and dimples were produced on the target material with laser wavelengths of 1064 nm, 532 nm, and 355 nm. The dimensions of the laser processed region were evaluated using the optical surface profiler.
5：Data Analysis Methods:
The average depth was estimated by sampling at 10 different locations inside the groove and dimple. The roughness inside the grooves was analyzed, and the optical reflectivity of the material was measured.
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