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Article

Tribological Performance of Diamond-like Nanocomposite Coatings: Influence of Environments and Laser Surface Texturing

1
Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia
2
National Research University “Moscow Power Engineering Institute”, 111250 Moscow, Russia
3
Institute for Applied Laser, Photonics and Surface Technologies ALPS, Bern University of Applied Sciences, CH-3400 Burgdorf, Switzerland
*
Author to whom correspondence should be addressed.
Present address: Lasea Switzerland SA, CH-2502 Biel/Bienne, Switzerland.
Academic Editor: Diego Martínez Martínez
Coatings 2021, 11(10), 1203; https://doi.org/10.3390/coatings11101203
Received: 30 August 2021 / Revised: 20 September 2021 / Accepted: 28 September 2021 / Published: 30 September 2021
(This article belongs to the Special Issue Tribological Studies on Diamond, DLC and Ta-C Coatings)
Diamond-like nanocomposite (DLN) films (a-C:H:Si:O films) are characterized by their unique structure and remarkable tribological properties to be pronounced under various environmental and surface modification conditions. In this paper, we investigated the effects of environments (humid air, water and oil lubrication, elevated temperatures) and laser surface texturing on tribological performance of DLN coatings. Femtosecond laser (wavelength 515 nm) was used for surface texturing. Comparative tests of DLN films sliding against different counterbodies (steel, Si3N4) in humid air and water demonstrated the low-friction and low-wear performance under water, in the absence of chemical interaction of water with the counterbody surface. The wear rates of the film and Si3N4 ball in water, 7.5 × 10−9 and 2.6 × 10−9 mm3/(Nm), were found to be considerably lower than the corresponding values 6.8 × 10−7 and 3.8 × 10−8 mm3/(Nm) in humid air, in spite of higher friction in water-lubricated sliding. Laser surface texturing of DLN films was performed to fabricate microcrater arrays, followed by tribological testing under oil lubrication at different temperatures, from 23 to 100 °C. The lubricated friction performance of laser-textured films was improved at both the room temperature and elevated temperatures. The friction coefficient was reduced from 0.1 (original film) to 0.083 for laser-textured film at room temperature, and then to 0.068 at 100 °C. The nano-/microfriction behavior of laser-structured surface characterized by lower friction forces than the original surface was demonstrated using friction force microscopy in ambient air. The obtained results demonstrate excellent tribological properties of DLN coatings in various environments, which can be further improved by femtosecond-laser-surface texturing. View Full-Text
Keywords: diamond-like nanocomposite (DLN) films; tribology; humid environments; laser surface texturing; oil lubrication; friction force microscopy diamond-like nanocomposite (DLN) films; tribology; humid environments; laser surface texturing; oil lubrication; friction force microscopy
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MDPI and ACS Style

Pimenov, S.M.; Zavedeev, E.V.; Zilova, O.S.; Lepekhov, A.P.; Jaeggi, B.; Neuenschwander, B. Tribological Performance of Diamond-like Nanocomposite Coatings: Influence of Environments and Laser Surface Texturing. Coatings 2021, 11, 1203. https://doi.org/10.3390/coatings11101203

AMA Style

Pimenov SM, Zavedeev EV, Zilova OS, Lepekhov AP, Jaeggi B, Neuenschwander B. Tribological Performance of Diamond-like Nanocomposite Coatings: Influence of Environments and Laser Surface Texturing. Coatings. 2021; 11(10):1203. https://doi.org/10.3390/coatings11101203

Chicago/Turabian Style

Pimenov, Sergei M., Evgeny V. Zavedeev, Olga S. Zilova, Alexander P. Lepekhov, Beat Jaeggi, and Beat Neuenschwander. 2021. "Tribological Performance of Diamond-like Nanocomposite Coatings: Influence of Environments and Laser Surface Texturing" Coatings 11, no. 10: 1203. https://doi.org/10.3390/coatings11101203

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