Friction and wear behavior of laser textured surface under lubricated initial point contact
Friction and wear behavior of laser textured surface under lubricated initial point contact
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DOI：
10.1016/j.wear.2010.12.049
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发表时间：
2011-07-29
期刊：
影响因子：
5
通讯作者：
Fenske, George
中科院分区：
文献类型：
--
作者：
Kovalchenko, Andriy;Ajayi, Oyelayo;Fenske, George
通过分析和实验证明，激光表面纹理化（LST）可以增强共形滑动部件的混合润滑、流体动力润滑和静压润滑。在LST机械密封和推力轴承中观察到更高的承载能力，更高的耐磨性和更低的摩擦系数等改进。然而，在非保形集中接触下，由于粗糙度增加，凹陷表面可能会对摩擦学行为产生不同的影响，这可能会增加对表面的磨料磨损。本文讨论了在点球-平面接触结构下，激光织构表面对摩擦学性能的影响。使用不同粘度的油，在0.015 ~ 0.75 m/s的速度下，在销盘式摩擦机上进行了摩擦学实验。对具有不同深度和密度的酒窝的磁盘进行了评估。结果表明，凹窝密度越大的圆盘对球试样的磨粒磨损越大。然而，更高的磨损率导致更快地产生保形接触，并从边界过渡到混合润滑状态，导致摩擦系数随着球磨损的增加而迅速降低。正如预期的那样，在使用低粘度油的测试中，磨损率更高。研究结果对优化LST技术在摩擦装置上的工业应用具有一定的指导意义。Elsevier B.V.出版
Laser surface texturing (LST) by dimpling has been shown analytically and experimentally to enhance mixed, hydrodynamic, and hydrostatic lubrication of conformal sliding components. Improvements such as higher load-carrying capacity, higher wear resistance, and lower friction coefficients were observed in LST mechanical seals and thrust bearings. However, under non-conformal concentrated contact, the dimpled surface may have a different effect on the tribological behavior as a result of increased roughness, which may increase abrasive wear on the counterface. This paper discusses the effect of laser-textured surfaces on the tribological properties under a point ball-on-flat contact configuration. Tribological experiments were performed with dimpled flats in a pin-on-disk friction machine at speeds from 0.015 to 0.75 m/s using oils with different viscosity. Disks with dimples having different depths and densities were evaluated. Results showed that disks with higher dimple density produced more abrasive wear on the ball specimen. However, this higher wear rate led to faster generation of conformal contacts and a transition from the boundary to mixed lubrication regime, resulting in a rapid reduction in the friction coefficient with increased ball wear. The wear rate was higher in tests with lower viscosity oils, as expected. Results of the study may be beneficial for optimization of LST technology for industrial application in friction units. Published by Elsevier B.V.