R and distilled water were performed Pentoxyverine Technical Information together with the DLN films (on Si substrate) of two.four thickness and high hardness H = 28 GPa and elastic modulus E = 182 GPa, sliding against 100Cr6-steel (H = eight GPa, E = 210 GPa) and Si3 N4 (H = 15 GPa, E = 310 GPa) balls of six mm-diameter. The use of the steel and ceramic balls was aimed at investigating the friction pair-dependent tribological behavior of the Coatings 2021, 11, x FOR PEER Review 6 of 16 tough DLN films beneath water lubrication and specifics on the corrosive effect for DLN-steel tribological contacts which was not discussed inside the early studies [8,9] of DLN films in water environment. The friction behavior of your DLN films during sliding in humid air and under water The friction behavior on the DLN films through sliding in humid air and under water is shown in Figure two. For the load F = 0.five N and ball radius Rb = 3 mm, the imply make contact with is shown in Figure 2. For the load = 0.five b = 3 mm, the imply speak to pressure (P), estimated from Hertz theory relationships [36], amounts to P = 0.35 GPa and stress (P), estimated = 0.35 GPa and 0.37 GPa for the DLN-steel 0.37 GPa for the DLN-steel and DLN-Si3N44contacts at the beginning of sliding. As follows 3 N contacts at the starting of sliding. As follows from Figure 2, the typical values of coefficient ( v in humid air are almost from Figure 2, the typical values of your friction coefficient (av)) in humid air are nearly precisely the same for the two friction pairs: = 0.065 for for the DLN-steel and 0.07 for the DLNthe identical for the two friction pairs: av v = 0.065 the DLN-steel and av = v = 0.07 for the DLN-Si3 N4 . water water lubrication the friction coefficient increases to 0.14 0.14 for fricSi3N4. Below Under lubrication the friction coefficient increases to av = v =for each each friction pairs. Some friction instabilities in the course of sliding water seem to become triggered by water tion pairs. Some friction instabilities through sliding inin water appear to becaused by water evaporation and Tesmilifene manufacturer varying thickness from the water layer. The comparative data in the wear evaporation and varying thickness on the water layer. The comparative information of the wear tracks profiles and put on scars images are tracks profiles and wear scars pictures are shown in Figure 3.Figure 2. Friction overall performance with the DLN films during sliding against 100Cr6 steel and Si N4 balls Figure two. Friction efficiency from the DLN films throughout sliding against 100Cr6 steel and Si3N4 balls in ambient air (RH = 50 ) and distilled water; the load 0.five N, the sliding speed 5 cm/s. in ambient air (RH = 50 ) and distilled water; the load 0.5 N, the sliding speed five cm/s.Coatings 2021, 11,six ofFigure 2. Friction overall performance of your DLN films through sliding against 100Cr6 steel and Si3N4 balls in ambient air (RH = 50 ) and distilled water; the load 0.five N, the sliding speed five cm/s.Figure three. WLI surface profiles across the wear tracks (a,d) and OM photos in the put on scars (b,c,e,f) on the ball surface Figure three. WLI surface profiles across the wear tracks (a,d) and OM pictures in the put on scars (b,c,e,f) on the ball surface formed immediately after two 10cycles of Si3N4 ball (a ) and steel ball (d ) sliding around the DLN films in humid air and in water. formed immediately after two 104 four cycles of Si3 N4 ball (a ) and steel ball (d ) sliding on the DLN films in humid air and in water.Traits with the put on prices in the DLN film and ball surfaces in humid air and Characteristics of your put on prices on the DLN film and ball surfaces in humid air and underwater are.