Gure 6b shows the decrease COF values for the laser-textured surface, v= 0.085 at R = 4.5 mm and v = 0.081 (averaged over two friction laser-textured surface, av = 0.085 at R = 4.5 mm and av = 0.081 (averaged more than two friction tests) at R = 33mm, than the friction coefficient v= 0.1 for the original film. The WLI tests) at R = mm, than the friction coefficient av = 0.1 for the original film. The WLI photos of your wear D-Sedoheptulose 7-phosphate Technical Information tracks and surface profiles across the tracks, measured right after removal of pictures of your put on tracks and surface profiles across the tracks, measured following removal the the filmfilm with n-heptane,shown in Figure 7, which give details about about the of oil oil with n-heptane, are are shown in Figure 7, which give info the wearwear character on the DLN film surface for the duration of lubricated sliding. The depth on the wear tracks on the original film (Figure 7a,d) and laser-textured surface at R = 4.5 mm (Figure 7b,d) is very small–dtr = 19 nm and dtr = 28 nm, respectively. The distinction of ten nm inside the track depth could possibly be as a consequence of (i) a thin layer of ablated material around the laser-texturedCoatings 2021, 11,9 ofcharacter of the DLN film surface during lubricated sliding. The depth of the put on tracks on the original film (Figure 7a,d) and laser-textured surface at R = 4.five mm (Figure 7b,d) is very small–dtr = 19 nm and dtr = 28 nm, respectively. The difference of ten nm within the track depth might be due to (i) a thin layer of ablated material on the laser-textured surface very easily removed from the track area through sliding [26], or (ii) slightly improved wear due to protruding edges of microcraters. The width of each the tracks is about wtr = 48 , smaller than the estimated worth of the speak to AZD4573 custom synthesis location diameter of 2Rcont 61 . The wear from the ball surface is also very tiny, which is pronounced inside the appearance of person scratches inside the put on scars surface significantly less discernible for the ball sliding around the original surface, as shown in Figure 8a,b. Under the observed low-wear prices with the film and ball counterparts the friction reduction around the laser-textured film (shown in Figure 6b) is due to lubricant film stress lift within the mixed lubrication regime of sliding, constant with our previous experiments with all the microcrater patterns of larger location density (20 and 40 ) and lubrication with synthetic motor oil of higher viscosity [26]. Compared with the prior outcomes [26], the influence in the comparatively little (10 ) dimpled area density around the lubricated friction performance of the fs-laser-textured DLN films seems substantial, Coatings 2021, 11, x FOR PEER Assessment 10 of 16 implying that the texture optimization is necessary for a provided tribosystem utilised and for every specific application of laser-patterned DLC films.Figure 7. WLI photos from the wear tracks Figure 7. WLI pictures with the wear tracks formed on (a) the original film at R = 7 mm and (b) laseroriginal film at R = 7 mm and (b) lasertextured surface at R = 4.5 mm just after lubricated sliding at T = 23 C, and (c) right after each of the successive textured surface at R = four.5 mm after lubricated sliding at T = 23 , and (c) right after all the successive lubricated sliding tests from the laser-textured film R = three mm and various temperatures; (d) surface lubricated sliding tests in the laser-textured film atat R = 3 mm and unique temperatures; (d) surface profiles across the tracks measured along the marked lines within the WLI images. profiles across the tracks measured along the marked line.
