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How to guide lubricants - Tailored laser surface patterns on stainless steel

机译：如何引导润滑剂-在不锈钢上定制的激光表面图案

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In this experimental study, periodic line-like structures with different periodicities (5, 10, 19, and 300 mu m) and structural depths (approximately 1 and 4 mu m) were fabricated on stainless steel samples (AISI-304) by short-pulse laser interference and ultrashort-pulse laser patterning. A detailed characterization of the resulting surface topography was performed by white light interferometry and scanning electron microscopy. The spreading dynamics of additive-free synthetic polyalphaolefine oil on a polished reference sample are compared to laser patterned surfaces. These studies are conducted using a newly developed test rig, which allowed for controlled temperature gradients and a precise recording of the spreading dynamics of lubricants on sample surfaces. It could be demonstrated that the spreading velocity parallel to the surface pattern is higher for all samples which can be explained by increased capillary forces and liquid pinning induced by the surface patterning. Furthermore, a decline of the spreading velocity over time for all samples and orientations is clearly visible which can be traced back to a viscosity increase induced by the temperature gradient and a reduced droplet volume. For parallel orientation, the experimental findings are in good agreement with the Lucas-Washburn equation and established models. (C) 2016 Elsevier B.V. All rights reserved.
机译：在本实验研究中，通过短时法在不锈钢样品（AISI-304）上制造了具有不同周期性（5、10、19和300μm）和结构深度（分别为1和4μm）的周期性线状结构。脉冲激光干涉和超短脉冲激光图案化。通过白光干涉法和扫描电子显微镜对所得表面形貌进行详细的表征。将不含添加剂的合成聚α-烯烃油在抛光参考样品上的扩散动力学与激光图案化表面进行比较。这些研究是使用新开发的试验设备进行的，该设备可以控制温度梯度并精确记录润滑剂在样品表面的扩散动力学。可以证明，对于所有样品，平行于表面图案的铺展速度都较高，这可以用表面图案引起的毛细作用力增加和液体钉扎来解释。此外，对于所有样品和取向，随着时间的流逝，扩散速度的下降是显而易见的，这可以追溯到温度梯度引起的粘度增加和液滴体积减少。对于平行定向，实验结果与Lucas-Washburn方程和已建立的模型非常吻合。 （C）2016 Elsevier B.V.保留所有权利。

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