Ce of DLN films in ambient air has been attributed to interfacial sliding among the DLN film and graphitizedCoatings 2021, 11, 1203. https://doi.org/10.3390/coatingshttps://www.mdpi.com/journal/coatingsCoatings 2021, 11,two oftribofilm formed on the ball counterface [11,12], confirmed also by later tribological research of DLN films [157]. Of wonderful interest would be the friction and wear properties of DLN films under the situations altering the graphitized tribofilm formation, e.g., below liquid (water, oil) lubrication, at elevated temperatures, which would extend the functional capabilities from the coatings. Owing to low internal stresses [7], it is possible to produce DLN films of fairly significant thickness (up to 10 ), retaining the hardness and elastic properties [7,19,20], which permits a laser surface texturing (LST) technique to be applied for further improvements of friction and wear properties of DLN coatings [16,20]. It was the little thickness (of 1 ) that strongly limited the laser surface texturing of DLC films in early experiments of lubricated sliding, when the DLC film deposition onto laser-textured steel or silicon substrates had been proposed as an option texturing technique for DLC-coated surfaces [214]. This approach, option to direct laser surface texturing of DLC films, had disadvantages dealing with the need of mechanical polishing of laser-textured substrates prior to deposition of thin DLC films (to eliminate protruding rims around dimples) [21,23], and weaker adhesion of DLC coatings at the dimple edges top to the film delamination throughout sliding [22]. Not too long ago, femtosecond (fs) laser processing of DLN films has been demonstrated as an efficient method to manage the friction properties in the nano, micro, and macroscale [16,20,257] and to improve tribological properties of laser-textured DLN films in lubricated sliding [16,26]. Many of the crucial findings for fs-laser-textured DLN films are connected to normal patterns of parallel microgrooves and arrays of microcraters fabricated below certain irradiation conditions limited to a offered structure size of 10 (groove width, crater diameter), structure depth of some microns and period of 20 . Further optimization of laser surface texturing of DLN films is necessary, aiming at fabrication of microstructures of decrease size and larger aspect ratio, and raise in the throughput of microprocessing with high spatial precision. Within this paper we concentrate around the effects of environments and laser surface texturing on tribological Tetracosactide Data Sheet overall performance of DLN coatings. Firstly, we present the outcomes of comparative tribological EIDD-1931 manufacturer testing of DLN films in humid air and water below linear reciprocating sliding against steel and silicon-nitride balls, and demonstrate the friction pair-dependent put on character in the rubbing supplies beneath water lubrication. Secondly, we present experimental data of high-precision surface texturing of DLN films with fs-laser pulses and fabrication of microcrater-based structures of hexagonal geometry, followed by tribological testing of your laser-textured DLN samples below oil lubrication at space temperature and 100 C. Furthermore, we demonstrate how the nano-/microfriction behavior is changed within the laser-structured area consisting of microcraters using friction force microscopy in humid air. 2. Components and Strategies 2.1. DLN Film Properties DLN films had been grown on silicon and steel substrates making use of a plasma-assisted chemical vapor deposition (PAC.
