Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement
Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement
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DOI：
10.3390/lubricants5030032
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发表时间：
2017-09-01
期刊：
影响因子：
3.5
通讯作者：
Greiner, Christian
中科院分区：
文献类型：
--
作者：
Schneider, Johannes;Braun, Daniel;Greiner, Christian
对抛光和激光织构的钢表面进行了单向滑动实验，研究了不同织构区密度、长宽比和韧窝排列方式对单向滑动性能的影响。该体系在100℃下以聚α-烯烃(PAO)为润滑剂，接触压力为3兆帕。对于Stribeck曲线的测量，滑动速度控制在40~2000 mm/S之间，织构面密度在5%~30%之间变化，最低摩擦值为10%。研究了长径比在0.02到0.2之间的变化，并测量了0.1的最低摩擦值。测试的凹陷排列为立方形、六角形和随机分布，织构面密度为10%，长径比为0.1。我们的结果表明，酒窝排列确实影响摩擦值，暗示了这样一个事实，即单个纹理元素确实相互影响。在六角形填料中发现了最佳的窝点排列方式。对于具有凹陷的摩擦学表面的形态纹理，这三个关键纹理参数的系统变化将允许对纹理参数进行战略性选择。这最大限度地发挥了激光表面处理在减少摩擦力从而减少二氧化碳排放方面的巨大潜力。
Unidirectional sliding experiments with polished and laser textured steel surfaces were carried out to investigate the effects of different textured area densities, aspect ratios and dimple arrangements. The system was lubricated with Polyalphaolefin (PAO) at 100 degrees C and the contact pressure was 3 MPa. For measuring Stribeck curves, the sliding speed was controlled between 40 and 2000 mm/s. The textured area density was varied between 5% and 30%, with the lowest friction values found for 10%. Aspect ratios ranging from 0.02 to 0.2 were investigated and for 0.1 the lowest friction values were measured. The dimple arrangements tested were cubic, hexagonal and a random distribution for a textured area density of 10% and an aspect ratio of 0.1. Our results demonstrate that the dimple arrangement does affect friction values, hinting to the fact that individual texture elements do influence each other. The optimum dimple arrangement was found in a hexagonal packing. This systematic variation of these three key texturing parameters for the morphological texturing of a tribological surface with dimples will allow a strategic choice of texturing parameters. This makes the most of the tremendous potential that laser surface texturing has for reducing friction forces and thereby CO2 emissions.