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http://dx.doi.org/10.9725/kstle.2014.30.1.59

Improvement of Tribological Characteristics of Multi-Scale Laser-Textured Surface in terms of Lubrication Regime  

Kim, Jong-Hyoung (Ultimate Manufacturing Technology Center, Korea Institute of Industrial Technology)
Choi, Si Geun (Department of Mechanical Engineering, Graduate School, Kyungpook National University)
Segu, Dawit Zenebe (Department of Mechanical Engineering, Graduate School, Kyungpook National University)
Jung, Yong-Sub (Department of Mechanical Engineering, Graduate School, Kyungpook National University)
Kim, Seock-Sam (Department of Mechanical Engineering, Kyungpook National University)
Publication Information
Tribology and Lubricants / v.30, no.1, 2014 , pp. 59-63 More about this Journal
Abstract
Laser Surface Texturing(LST) is a surface engineering process used to improve tribological characteristics of materials by creating patterned microstructures on the mechanical contact surface. In LST technology, a pulsated laser beam is used to create arranged dimples on a surface by a material ablation process, which can improve such as load capacity, wear resistances, lubrication lifetime, and reduce friction coefficients. In the present study, the effect of multi-scale LST on lubricant regime was investigated. A pulsed Nd:YAG laser was applied on the bearing steel(AISI 52100) to create arranged dimples. To optimize the surface texturing effect on friction, multi-scale texture dimples with some specific formula arrays were fabricated by combining circles, ellipses and the laser ablation process. The tribological testing of multi-scale textured surface was performed by a flat-on-flat unidirectional tribometer under lubrication and the results compared with that of the non-textured surface. Through an increase in sliding speed, the beneficial effect of multi-scale LST performance was achieved. The multi-scale textured surface had lower friction coefficient performances than the non-textured surface due to the hydrodynamic lubrication effect.
Keywords
laser surface texture; lubrication regime; friction; surface modification;
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