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Positive effect of laser structured surfaces on tribological performance

 
: Stark, Tobias; Alamri, Sabri; Aguilar-Morales, Alfredo Ismael; Kiedrowski, Thomas; Lasagni, Andrés-Fabián

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Journal of Laser Micro/Nanoengineering. Online journal 14 (2019), No.1, pp.13-18
http://www.jlps.gr.jp/jlmn/index.php?action=laser_archive_vol
ISSN: 1880-0688
European Commission EC
H2020; 675063; Laser4FUN
EUROPEAN ESRs NETWORK ON SHORT PULSED LASER MICRO/NANOSTRUCTURING OF SURFACES
English
Journal Article
Fraunhofer IWS ()
laser surface texturing; surface functionalization; tribology; direct laser interference patterning (DLIP); Direct Laser Writing (DLW); stribeck curve; friction

Abstract
In recent years laser surface structuring has emerged as a viable tool to enhance surface functionality. In this study, an ultrashort pulsed laser is used to create advanced surface structures in order to improve the tribological properties of steels. The objective is to decrease friction and wear especially for the mixed lubrication regime in which body and counterbody are in contact. We state the hypothesis that the high flow resistance in small channels helps to hold the lubricant in the tribocontact and therefore separates contacting asperities. Direct Laser Writing and Direct Laser Interference Patterning methods are used to create cross-like structures of different channel sizes. Tribological properties of these structures are evaluated by means of a ball-on-disc tribometer. The surface structures and the wear behavior are analyzed with confocal microscopy. The results show a decrease of the coefficient of friction depending on the size of the channels. This behavior is discussed and compared to the hypothesis stated above.

: http://publica.fraunhofer.de/documents/N-541041.html