윤활영역에서 멀티크기 Laser Surface Texturing 효과

Abstract

Laser Surface Texturing(LST) is a surface engineering process used to improve tribological characteristicsof materials by creating patterned microstructures on the mechanical contact surface. In LST technology, a pulsatedlaser beam is used to create arranged dimples on a surface by a material ablation process, which can improve such asload capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect ofmulti-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on the bearing steel(AISI52100) to create arranged dimples. To optimize the surface texturing effect on friction, multi-scale texture dimples withsome specific formula arrays were fabricated by combining circles, ellipses and the laser ablation process. The tri-bological testing of multi-scale textured surface was performed by a flat-on-flat unidirectional tribometer under lubri-cation and the results compared with that of the non-textured surface. Through an increase in sliding speed, thebeneficial effect of multi-scale LST performance was achieved. The multi-scale textured surface had lower frictioncoefficient performances than the non-textured surface due to the hydrodynamic lubrication effect.Keywords: laser surface texture (레이저 표면 텍스처), lubrication regime (윤활영역), friction (마찰), surfacemodification (표면개질)