Femtosecond laser-induced periodic surface structures on steel and titanium alloy for tribological applications
Femtosecond laser-induced periodic surface structures on steel and titanium alloy for tribological applications
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DOI：
10.1007/s00339-014-8229-2
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发表时间：
2014-10-01
影响因子：
2.7
通讯作者：
Krueger, J.
中科院分区：
文献类型：
--
作者：
Bonse, J.;Koter, R.;Krueger, J.
利用多路飞秒激光脉冲(脉冲宽度30ps，中心波长790 nm)在不锈钢(100Cr6)和钛合金(Ti6Al4V)表面形成了周期性的激光诱导表面结构(LIPSS、波纹)。在样品扫描几何结构中优化了实验条件(激光通量、空间光斑重叠)，以加工由纳米结构均匀覆盖的大表面积(5×5 mm(2))。对辐照后的表面区进行了白光干涉显微镜和扫描电子显微镜观察，显示出600 nm左右的空间周期。纳米结构表面的摩擦学性能的特征是在石蜡油和商业发动机油中作为润滑剂与硬化钢球往复滑动，然后检查磨损轨迹。在特定条件下，在钛合金表面，激光辐照(LIPSS覆盖)表面的摩擦系数比未辐照的表面显著降低两倍以上，这表明激光表面结构化在摩擦学应用中具有潜在的好处。
Laser-induced periodic surface structures (LIPSS, ripples) were generated on stainless steel (100Cr6) and titanium alloy (Ti6Al4V) surfaces upon irradiation with multiple femtosecond laser pulses (pulse duration 30 fs, central wavelength 790 nm). The experimental conditions (laser fluence, spatial spot overlap) were optimized in a sample-scanning geometry for the processing of large surface areas (5 x 5 mm(2)) covered homogeneously by the nanostructures. The irradiated surface regions were subjected to white light interference microscopy and scanning electron microscopy revealing spatial periods around 600 nm. The tribological performance of the nanostructured surface was characterized by reciprocal sliding against a ball of hardened steel in paraffin oil and in commercial engine oil as lubricants, followed by subsequent inspection of the wear tracks. For specific conditions, on the titanium alloy a significant reduction of the friction coefficient by a factor of more than two was observed on the laser-irradiated (LIPSS-covered) surface when compared to the non-irradiated one, indicating the potential benefit of laser surface structuring for tribological applications.