scholarly journals Influence of Femtosecond Laser Surface Nanotexturing on the Friction Behavior of Silicon Sliding Against PTFE

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1237 ◽  
Author(s):  
Alves-Lopes ◽  
Almeida ◽  
Oliveira ◽  
Vilar
Keyword(s):  
Friction Coefficient ◽  
Femtosecond Laser ◽  
Applied Load ◽  
Laser Surface ◽  
Surface Structures ◽  
Testing Time ◽  
Friction Behavior ◽  
Periodic Surface ◽  
Sliding Direction ◽  
Increasing Load

The aim of the present work was to investigate the influence of laser-induced periodic surface structures (LIPSS) produced by femtosecond laser on the friction behavior of silicon sliding on polytetrafluoroethylene (PTFE) in unlubricated conditions. Tribological tests were performed on polished and textured samples in air using a ball-on-flat nanotribometer, in order to evaluate the friction coefficient of polished and textured silicon samples, parallel and perpendicularly to the LIPSS orientation. In the polished specimens, the friction coefficient decreases with testing time at 5 mN, while it increases slightly at 25 mN. It also decreases with increasing applied load. For the textured specimens, the friction coefficient tends to decrease with testing time in both sliding directions studied. In the parallel sliding direction, the friction coefficient decreases with increasing load, attaining values similar to those measured for the polished specimen, while it is independent of the applied load in the perpendicular sliding direction, exhibiting values lower than in the two other cases. These results can be explained by variations in the main contributions to friction and in the wear mechanisms. The influence of the temperature increase at the interface and the consequent changes in the crystalline phases of PTFE are also considered.

scholarly journals High-speed manufacturing of highly regular femtosecond laser-induced periodic surface structures: physical origin of regularity

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Iaroslav Gnilitskyi ◽  
Thibault J.-Y. Derrien ◽  
Yoann Levy ◽  
Nadezhda M. Bulgakova ◽  
Tomáš Mocek ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Speed ◽  
Surface Structures ◽  
Physical Origin ◽  
Periodic Surface

Maskless formation of uniform subwavelength periodic surface structures by double temporally-delayed femtosecond laser beams

2019 ◽  
Vol 471 ◽  
pp. 516-520 ◽  
Author(s):  
Sohail A. Jalil ◽  
Jianjun Yang ◽  
Mohamed ElKabbash ◽  
Subhash C. Singh ◽  
Chunlei Guo
Keyword(s):  
Femtosecond Laser ◽  
Surface Structures ◽  
Laser Beams ◽  
Periodic Surface

scholarly journals Titanium surface modification using femtosecond laser with 1013–1015 W/cm2 intensity in vacuum

2012 ◽  
Vol 31 (1) ◽  
pp. 29-36 ◽  
Author(s):  
M. Trtica ◽  
D. Batani ◽  
R. Redaelli ◽  
J. Limpouch ◽  
V. Kmetik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Femtosecond Laser ◽  
Titanium Surface ◽  
Femtosecond Lasers ◽  
Single Pulse ◽  
Surface Structures ◽  
Pulse Regime ◽  
Periodic Surface ◽  
Reduced Intensity ◽  
Surface Changes

AbstractThe response of titanium surface irradiated with high intensity (1013 – 1015 W/cm2) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).

Electrophysical Anisotropy of Periodic Surface Structures Induced by Femtosecond Laser on Amorphous Silicon

2020 ◽  
Author(s):  
D.V. Shuleiko ◽  
M.N. Martyshov ◽  
S.V. Zabotnov ◽  
D.E. Presnov ◽  
A.G. Kazanskii ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Amorphous Silicon ◽  
Surface Structures ◽  
Periodic Surface
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