Aluminum alloy nanosecond vs femtosecond laser marking

Designed micro-nano structures on the surface of aluminum alloy provide excellent light trapping properties that can be used extensively in thermal photovoltaics, sensors, etc. However, the fabrication of high-performance antireflective micro-nano structures on aluminum alloy is challenging because aluminum has shallow intrinsic losses and weak absorption. A two-step strategy is proposed for fabricating broadband antireflection structures by superimposing nanostructures onto microscale structures. By optimizing the processing parameters of femtosecond laser, the average reflectances of 2.6% within the visible spectral region (400–800 nm) and 5.14% within the Vis-NIR spectral region (400–2500 nm) are obtained.

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Formation of Oxide Layers with Femtosecond Laser on Steel Surfaces for Color Marking

International Journal of Engineering and Management Sciences ◽

10.21791/ijems.2020.2.22. ◽

2020 ◽

Vol 5 (2) ◽

pp. 174-178

Author(s):

Gergely Juhász ◽

Miklós Berczeli ◽

Zoltán Weltsch

Keyword(s):

Femtosecond Laser ◽

Ultrashort Pulse ◽

Metal Surfaces ◽

Femtosecond Pulse ◽

Surface Structures ◽

Laser Marking ◽

Periodic Surface ◽

Oxide Layers ◽

Ultrashort Pulse Lasers ◽

Steel Surfaces

With the appearance of ultrashort pulse lasers, the researchers have begun working on various laser marking technology. Atmospheric heating and ablation of a surface induce laser coloration of metal surfaces. However, their application is still problematic today in the industry. With the appearance of femtosecond pulse lasers, a new concept became available for color marking. This concept is based on the formation of laser-induced periodic surface structures (LIPSS) on metal surfaces. The purpose of this article is to summarize the literature of laser color marking with ultrashort pulse lasers.

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Improvement of Machining Performance of Small-Diameter End Mill by Means of Micro- and Nanometer-Scale Textures

International Journal of Automation Technology ◽

10.20965/ijat.2016.p0882 ◽

2016 ◽

Vol 10 (6) ◽

pp. 882-890 ◽

Cited By ~ 8

Author(s):

Noritaka Kawasegi ◽

◽

Hiroshi Sugimori ◽

Noboru Morita ◽

Toru Sekiguchi ◽

...

Keyword(s):

Aluminum Alloy ◽

Femtosecond Laser ◽

Cutting Forces ◽

Cutting Tools ◽

Small Diameter ◽

Nanometer Scale ◽

End Mill ◽

Machining Performance ◽

End Mills ◽

Nanoscale Features

The purpose of this study is to develop novel cutting tools with micro- or nanoscale textures on their surfaces. Texturing micro- or nanoscale features on a surface allows us to control the tribological characteristics of the tool. For this research, textures were applied to end mills with a diameter of 0.5 mm using a femtosecond laser, and milling experiments were conducted on aluminum alloy to evaluate the developed tools. The applied texture decreased the cutting forces. This effect depends on the shape of the texture: groove textures are more effective for reducing friction and the resultant cutting forces. Periodic textures fabricated through the interference of the laser were effective at reducing the adhesion of the work material. A larger effect was obtained for shallow and large pitch textures. The results indicate that the proposed method is effective at improving the machining performance of small-diameter end mills.

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