Ultrafast Laser Texturing of Metal Surfaces: Effects of Process Parameters on Surface Reflectance and Possibility of Hierarchical Structuring

IF 1 Q4 ENGINEERING, MANUFACTURING
N. Khadka, Yucheng Yang, J. Haug, M. Palei, M. Rosenberger, Anthony Hoffman, E. Kinzel
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引用次数: 1

Abstract

Ultrafast laser processing has been widely studied for surface texturing. The complex interaction between the laser energy, plasma, and surface chemistry produces complex morphologies including Laser-Induced Periodic Surface Structures and random higher aspect ratio geometries. Laser texturing allows engineering of metallic surface’s wettability as well as the reflectance on either broadband or narrowband basis. This paper experimentally maps the laser process parameters to the surface morphology and diffuse reflectance for stainless steel, aluminum, and copper substrates. All experiments are conducted with a 1030 nm wavelength, 230 fs pulse length laser in an ambient environment. The results show how the common morphological regimes shift with material and how the reflectance varies with morphology. To further decrease the reflectance, hierarchical structures are generated by first locally micromachining the surface to form a lattice of trenches using the focused laser beam, before texturing the surface with a rastered, defocused laser beam. The micromachined features interact with laser texturing and increase light trapping on the surface. This is a function of the depth and periodicity of the hierarchical structures as well as the surface topography. This approach provides the ability to lower the surface reflectance and add an extra level of control for directing deep micro-cavities along the surface.
金属表面的超快激光织构:工艺参数对表面反射率的影响及分层结构的可能性
超快激光加工在表面织构加工中得到了广泛的研究。激光能量、等离子体和表面化学之间的复杂相互作用产生了复杂的形貌,包括激光诱导的周期性表面结构和随机的高纵横比几何形状。激光变形可以在宽频或窄带的基础上对金属表面的润湿性和反射率进行工程处理。本文通过实验将激光工艺参数映射到不锈钢、铝和铜基材的表面形貌和漫反射。所有实验均在环境中使用波长为1030nm,脉冲长度为230fs的激光器进行。结果显示了常见的形态制度如何随材料而变化,以及反射率如何随形态而变化。为了进一步降低反射率,首先使用聚焦激光束对表面进行局部微加工,形成沟槽晶格,然后使用光栅、散焦激光束对表面进行纹理处理,从而产生层次结构。微机械加工的特征与激光纹理相互作用,增加了表面的光捕获。这是层次结构的深度和周期性以及表面地形的函数。这种方法能够降低表面反射率,并为沿着表面定向深层微腔增加了额外的控制水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Micro and Nano-Manufacturing
Journal of Micro and Nano-Manufacturing ENGINEERING, MANUFACTURING-
CiteScore
2.70
自引率
0.00%
发文量
12
期刊介绍: The Journal of Micro and Nano-Manufacturing provides a forum for the rapid dissemination of original theoretical and applied research in the areas of micro- and nano-manufacturing that are related to process innovation, accuracy, and precision, throughput enhancement, material utilization, compact equipment development, environmental and life-cycle analysis, and predictive modeling of manufacturing processes with feature sizes less than one hundred micrometers. Papers addressing special needs in emerging areas, such as biomedical devices, drug manufacturing, water and energy, are also encouraged. Areas of interest including, but not limited to: Unit micro- and nano-manufacturing processes; Hybrid manufacturing processes combining bottom-up and top-down processes; Hybrid manufacturing processes utilizing various energy sources (optical, mechanical, electrical, solar, etc.) to achieve multi-scale features and resolution; High-throughput micro- and nano-manufacturing processes; Equipment development; Predictive modeling and simulation of materials and/or systems enabling point-of-need or scaled-up micro- and nano-manufacturing; Metrology at the micro- and nano-scales over large areas; Sensors and sensor integration; Design algorithms for multi-scale manufacturing; Life cycle analysis; Logistics and material handling related to micro- and nano-manufacturing.
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