Femtosecond-laser surface modification and micropatterning of diamond-like nanocomposite films to control friction on the micro and nanoscale.

Pimenov, S.M.; Zavedeev, E.V.; Arutyunyan, N.R.; Zilova, O.S.; Shupegin, M.L.; Jäggi, B.; Neuenschwander, Beat (2017). Femtosecond-laser surface modification and micropatterning of diamond-like nanocomposite films to control friction on the micro and nanoscale. Journal of Applied Physics, 122(14), p. 145301. 10.1063/1.4998586

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Laser surface micropatterning (texturing) of hard materials and coatings is an effective technique to improve tribological systems. In the paper, we have investigated the laser-induced surface modifications and micropatterning of diamond-like nanocomposite (DLN) films (a-C:H,Si:O) using IR and visible femtosecond (fs) lasers, focusing on the improvement of frictional properties of laser-patterned films on the micro and macroscale. The IR and visible fs-lasers, operating at λ = 1030 nm and λ = 515 nm wavelengths (pulse duration 320 fs and pulse repetition rate 101 kHz), are used to fabricate different patterns for subsequent friction tests. The IR fs-laser is applied to produce hill-like micropatterns under conditions of surface graphitization and incipient ablation, and the visible fs-laser is used for making microgroove patterns in DLN films under ablation conditions. Regimes of irradiation with low-energy IR laser pulses are chosen to produce graphitized micropatterns. For these regimes, results of numerical calculations of the temperature and graphitized layer growth are presented to show good correlation with surface relief modifications, and the features of fs-laser graphitization are discussed based on Raman spectroscopy analysis. Using lateral force microscopy, the role of surface modifications (graphitization, nanostructuring) in the improved microfriction properties is investigated. New data of the influence of capillary forces on friction forces, which strongly changes the microscale friction behaviour, are presented for a wide range of loads (from nN to μN) applied to Si tips. In macroscopic ball-on-disk tests, a pair-dependent friction behaviour of laser-patterned films is observed. The first experimental data of the improved friction properties of laser-micropatterned DLN films under boundary lubricated sliding conditions are presented. The obtained results show the DLN films as an interesting coating material suitable for laser patterning applications in tribology. ACKNOWLEDGMENTS This work was supported by the Russian Science Foundation under Project No. 15-12-00039.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS School of Engineering and Computer Science
Name:	Pimenov, S.M.; Zavedeev, E.V.; Arutyunyan, N.R.; Zilova, O.S.; Shupegin, M.L.; Jäggi, B. and Neuenschwander, Beat0000-0001-9715-8557
ISSN:	0021-8979
Language:	English
Submitter:	Beat Neuenschwander
Date Deposited:	13 Nov 2019 09:38
Last Modified:	08 Jan 2024 12:29
Publisher DOI:	10.1063/1.4998586
URI:	https://arbor.bfh.ch/id/eprint/5672