Enhancing antireflection property of silicon through direct picosecond laser surface texturing

2018 ◽  
Vol 50 (6) ◽  
pp. 616-622 ◽  
Author(s):  
K. E. Sarath Raghavendra Babu ◽  
Muthukannan Duraiselvam ◽  
L. Manikanta Reddy
Keyword(s):  
Surface Texturing ◽  
Picosecond Laser ◽  
Laser Surface ◽  
Laser Surface Texturing

scholarly journals A Simple Model to Predict Machined Depth and Surface Profile for Picosecond Laser Surface Texturing

2018 ◽  
Vol 8 (11) ◽  
pp. 2111 ◽  
Author(s):  
Jieyu Xian ◽  
Xingsheng Wang ◽  
Xiuqing Fu ◽  
Zhengwei Zhang ◽  
Lu Liu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Surface Texturing ◽  
Surface Profile ◽  
Picosecond Laser ◽  
Scanning Speed ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Micro Channels ◽  
Surface Profiles ◽  
Simulation Parameters

A simple mathematical model was developed to predict the machined depth and surface profile in laser surface texturing of micro-channels using a picosecond laser. Fabrication of micro-craters with pulse trains of different numbers was initially performed. Two baseline values from the created micro-craters were used to calculate the estimated simulation parameters. Thereafter, the depths and profiles with various scanning speeds or adjacent intervals were simulated using the developed model and calculated parameters. Corresponding experiments were conducted to validate the developed mathematical model. An excellent agreement was obtained for the predicted and experimental depths and surface profiles. The machined depth decreased with the increase of scanning speed or adjacent interval.

scholarly journals Experimental Analysis of Microstructured Steel Surfaces for Wet Tribological Applications in the Low Velocity Regime

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Mateusz Chlipala ◽  
Johannes Schneider ◽  
Volker Schulze
Keyword(s):  
Friction Coefficient ◽  
Wear Debris ◽  
Laser System ◽  
Surface Texturing ◽  
Picosecond Laser ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Low Velocity ◽  
Pin On Disc ◽  
Steel Surfaces

The surface topography plays an important role in the design of a function-optimised surface. Therefore, the influence of topography with microsized structures produced by laser surface texturing (LST) is experimentally examined under lubricated sliding conditions. The structured specimens were made of AISI 51200 (DIN 100Cr6) hardened to about 800 HV. Concerning the requirements of tribological testing without any debris caused by the preprocessing, the structuring was carried out using a picosecond laser system (Trumpf TruMicro) with 6 ps pulse duration. A laboratory pin-on-disc tribometer (Plint TE-92 HS) was used for the tests, which were run under wet conditions with counterbodies made of bronze and steel at a nominal contact pressure of up to 4 MPa and sliding speeds between 0.04 and 2.0 m/s. Furthermore, start-stop cycles with accelerating and decelerating shares were used to simulate an automotive start-stop system. In the tribological experiments, a significant reduction of the friction coefficient was observed compared to sliding pairs without microstructured pin surfaces. Whereas no measureable wear occurred on the steel pins and discs, the bronze discs showed a significant amount of wear and the microstructures on the pin surfaces mated against bronze discs were almost completely filled with wear debris.

scholarly journals Picosecond Laser Surface Texturing of a Stavax Steel Substrate for Wettability Control

Engineering ◽  
2018 ◽  
Vol 4 (6) ◽  
pp. 816-821 ◽  
Author(s):  
Xincai Wang ◽  
Hongyu Zheng ◽  
Yinchi Wan ◽  
Wenhe Feng ◽  
Yee Cheong Lam
Keyword(s):  
Steel Substrate ◽  
Surface Texturing ◽  
Picosecond Laser ◽  
Laser Surface ◽  
Laser Surface Texturing

scholarly journals Effects of Laser Surface Texturing and Lubrication on the Vibrational and Tribological Performance of Sliding Contact

Lubricants ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Shunchu Liu ◽  
Qingyi Sai ◽  
Shuwen Wang ◽  
John Williams
Keyword(s):  
Surface Texturing ◽  
Picosecond Laser ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Area Density ◽  
Surface Textures ◽  
Frictional Surfaces ◽  
Frictional Vibrations ◽  
Frictional Noise

Various textures are fabricated by a picosecond laser machine on the surfaces of circular stainless steel specimens. Vibrational and tribological effects of laser surface textures are investigated by means of a tribometer and a data acquisition and signal processing (DASP) system. Experimental results show that surface textures can reduce the coefficients of friction (COFs), enhance the wear resistance, and improve the dynamical performance of frictional surfaces. In this study, the surface with micro circular dimples in diameter of 150 μm or textured area density of 25% has the best tribological and dynamical performance. Compared with the non-textured surface, the surface with circular dimples in diameter of 150 μm and 15% textured area density has 27% reduction of COFs, 95% reduction of frictional vibrations, and 66% reduction of frictional noise. The frictional vibrations and noise in the sliding contacts can be effectively reduced by adding graphene to the lubrication oil, and the surface textures enhance the frictional noise reduction performance of lubrication.

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