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Laser surface micro texturing to enhance the frictional behavior of lubricated steel

机译：激光表面微纹理化处理可增强润滑钢的摩擦性能

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摘要

Surface micro-texturing has been widely theoretically and experimentally demonstrated to be beneficial to friction reduction in sliding contacts under lubricated regimes. Several microscopic mechanisms have been assessed to concur to this macroscopic effect. In particular, the micro-textures act as lubricant reservoirs, as well as traps for debris. Furthermore, they may produce a local reduction of the shear stress coupled with a stable hydrodynamic pressure between the lubricated sliding surfaces. All these mechanisms are strongly dependent both on the micro-texturing geometry and on the operating conditions. Among the various micro-machining techniques, laser ablation with ultrashort pulses is an emerging technology to fabricate surface textures, thanks to the intrinsic property of laser light to be tightly focused and the high flexibility and precision achievable. In addition, when using sub-ps pulses, the thermal damage on the workpiece is negligible and the laser surface textures (LST) are not affected by burrs, cracks or resolidified melted droplets, detrimental to the frictional properties. In this work several LST geometries have been fabricated by fs-laser ablation of steel surfaces, varying the diameter, depth and spacing of micro-dimples squared patterns. We compared their frictional performance with a reference non-textured sample, on a range of sliding velocities from the mixed lubrication to the hydrodynamic regime. The measured Stribeck curves data show that the depth and diameter of the microholes have a huge influence in determining the amount of friction reduction at the interface. Different theoretical interpretations to explain the experimental findings are also provided.
机译：表面微观纹理已在理论上和实验上得到广泛证明，有利于在润滑状态下降低滑动触点的摩擦。已经评估了几种微观机制来认同这种宏观效应。尤其是，微纹理既可以用作润滑剂的储存器，也可以用作碎屑的收集器。此外，它们可能导致剪切应力的局部减小以及在润滑的滑动表面之间的稳定的流体动力压力。所有这些机制都强烈地取决于微观纹理的几何形状和操作条件。在各种微加工技术中，由于可以紧密聚焦激光的固有特性以及可以实现的高柔韧性和高精度，因此具有超短脉冲的激光烧蚀是一种制造表面纹理的新兴技术。此外，使用亚ps脉冲时，对工件的热损伤可以忽略不计，并且激光表面纹理（LST）不受毛刺，裂纹或重新凝固的熔滴影响，而这对摩擦性能不利。在这项工作中，通过钢表面的fs激光烧蚀，改变微凹坑方形图案的直径，深度和间距，已经制造出几种LST几何形状。我们在从混合润滑到流体动力学状态的一系列滑动速度上，将它们的摩擦性能与参考的非织构样品进行了比较。测得的斯特里贝克曲线数据表明，微孔的深度和直径对确定界面处的摩擦减小量有很大的影响。还提供了不同的理论解释来解释实验结果。

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  • 来源
    《Laser-based micro- and nanoprocessing VIII》|2014年|896806.1-896806.8|共8页
  • 会议地点 San Francisco CA(US)
  • 作者

    Antonio Ancona; Giuseppe Carbone; Michele Scaraggi; Francesco P. Mezzapesa; Donato Sorgente; Pietro M. Lugara;

  • 作者单位

    CNR-IFN Institute for Photonics and Nanotechnologies UOS Bari, via Amendola 173, 70126 Bari, Italy;

    Dept. of Mechanical, Mathematics and Management, Politecnico di Bari, V.le Japigia 182, 70126 Bari, Italy;

    DII, Univ. del Salento, 73100 Monteroni-Lecce, Italy;

    CNR-IFN Institute for Photonics and Nanotechnologies UOS Bari, via Amendola 173, 70126 Bari, Italy,Dipartimento Interateneo di Fisica, Univ. degli Studi di Bari, via Amendola 173, 70126 Bari, Italy;

    Dept. of Mechanical, Mathematics and Management, Politecnico di Bari, V.le Japigia 182, 70126 Bari, Italy;

    Dipartimento Interateneo di Fisica, Univ. degli Studi di Bari, via Amendola 173, 70126 Bari, Italy;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laser surface texturing; femtosecond laser; laser ablation; friction;

    机译：激光表面纹理化；飞秒激光激光烧蚀摩擦;

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