Femtosecond laser surface texturing of diamond-like nanocomposite films to improve tribological properties in lubricated sliding
Femtosecond laser surface texturing of diamond-like nanocomposite films to improve tribological properties in lubricated sliding
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DOI：
10.1016/j.diamond.2019.01.022
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发表时间：
2019-03-01
影响因子：
4.1
通讯作者：
Shupegin, M. L.
中科院分区：
文献类型：
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作者：
Pimenov, S. M.;Jaeggi, B.;Shupegin, M. L.
我们报告飞秒激光烧蚀和表面微图案化（纹理）的类金刚石纳米复合材料（DLN）薄膜（a-C：H：Si：O薄膜），旨在改善润滑滑动条件下的激光图案化薄膜的摩擦学性能。飞秒激光系统在波长515 nm处产生320-fs持续时间的脉冲。研究了飞秒激光烧蚀2.7 μ m厚DLN薄膜的工艺条件，以确定激光表面毛化的最佳辐照参数，并满足光斑尺寸小、烧蚀速率高、表面质量好、图案深度小于薄膜厚度的要求。周期性的微坑图案（直径10 μ m，2.2 μ m的深度，和不同的面积密度的微坑）已制造的DLN膜上的面积为6毫米× 10毫米的大小。在油润滑（低粘度和高粘度的发动机油）的存在下，在线性往复滑动下对100Cr 6钢球使用球-平摩擦计对原始DLN膜和激光图案化DLN膜进行摩擦学测试。球对平的调查表明，减少摩擦和磨损性能的激光纹理DLN膜，取决于微坑的面积密度和润滑条件。结果表明，飞秒激光表面毛化是一种有效的技术，以改善润滑滑动性能的DLN涂层。
We report on femtosecond laser ablation and surface micropatterning (texturing) of diamond-like nanocomposite (DLN) films (a-C:H:Si:O films), aimed to improve tribological properties of laser-patterned films under lubricated sliding conditions. Femtosecond laser system generating pulses of 320-fs duration at the wavelength 515 nm is applied. Femtosecond laser ablation of 2.7-mu m-thick DLN films is studied to determine optimum irradiation parameters for laser surface texturing with the requirements of the minimal spot size, high ablation rate, surface quality and pattern depth less than the film thickness. Periodic microcrater patterns (with 10 mu m diameter, 2.2 mu m depth, and different area density of microcraters) have been fabricated on the DLN films over the areas of 6 mm x 10 mm size. Tribological tests of the original and laser-patterned DLN films are performed using a ball-on-flat tribometer under linear reciprocating sliding against 100Cr6 steel balls in the presence of oil lubrication (engine oils of low and high viscosity). The ball-on-flat investigations have demonstrated the reduced friction and wear properties of the laser-textured DLN films, depending on the area density of microcraters and lubrication conditions. The obtained results evidence that femtosecond laser surface texturing is an effective technique to improve lubricated sliding performance of the DLN coatings.