윤활영역에서 멀티크기 Laser Surface Texturing 효과
Improvement of Tribological Characteristics of Multi-Scale Laser-Textured Surface in terms of Lubrication Regime
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초록
Laser surface texturing (LST) is a surface engineering process used to improve the tribological characteristicsof materials by creating patterned microstructures on the mechanical contact surface. In LST, a pulsatedlaser beam is used to create arranged dimples on a surface by a material ablation process, which canimprove tribological characteristics such as load capacity, wear resistances, and lubrication lifetime, and reducefriction coefficients. In the present study, the effect of multi-scale LST on the lubricant regime was investigated. A pulsed Nd:YAG laser was applied to bearing steel (AISI 52100) to create arranged dimples. To optimize theeffect of surface texturing on frictional characteristics, multi-scale texture dimples with specific formula arrayswere fabricated by combining circles, ellipses, and the laser ablation process. The tribological testing of themulti-scale textured surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and theresults were compared with those for a non-textured surface. The results revealed the beneficial effects of multiscaleLST performance in terms of an increase in the sliding speed. The multi-scale textured surface had a lowerfriction coefficient than the non-textured surface owing to the hydrodynamic lubrication effect.
Abstract
Laser surface texturing (LST) is a surface engineering process used to improve the tribological characteristicsof materials by creating patterned microstructures on the mechanical contact surface. In LST, a pulsatedlaser beam is used to create arranged dimples on a surface by a material ablation process, which canimprove tribological characteristics such as load capacity, wear resistances, and lubrication lifetime, and reducefriction coefficients. In the present study, the effect of multi-scale LST on the lubricant regime was investigated. A pulsed Nd:YAG laser was applied to bearing steel (AISI 52100) to create arranged dimples. To optimize theeffect of surface texturing on frictional characteristics, multi-scale texture dimples with specific formula arrayswere fabricated by combining circles, ellipses, and the laser ablation process. The tribological testing of themulti-scale textured surface was performed by a flat-on-flat unidirectional tribometer under lubrication, and theresults were compared with those for a non-textured surface. The results revealed the beneficial effects of multiscaleLST performance in terms of an increase in the sliding speed. The multi-scale textured surface had a lowerfriction coefficient than the non-textured surface owing to the hydrodynamic lubrication effect.
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