Summarized in Figure 4.four. The put on price values are the averaged values below water are summarized in Figure The put on rate values will be the averaged values of of tribotests performed for each and every sliding condition. The most pronounced effect from the 22 tribotests performed for each sliding condition. By far the most pronouncedeffect with the aqueous atmosphere around the put on (±)13-HpODE Autophagy behavior was observed inside the sliding tests against the aqueous environment on the wear behavior was observed in the sliding tests against the Si3 N ball, as shown in Figure 3a . The put on with the DLN film beneath water lubrication is Si3N4 4 ball, as shown inFigure 3a . The wear of the DLN film below water lubrication is very low compared to the friction tests in humid air, as directly follows from comparison quite low when compared with the friction tests in humid air, as directly follows from comparison of your put on track profiles in Figure 3a. The wear price on the DLN film under water lubrication amounts to W = 7.five 10-9 mm3 /(Nm), two orders of magnitude lower than the put on price W = 6.eight 10-7 mm3 /(Nm) from the film in humid air, see Figure 4. Furthermore, the wear price from the Si3 N4 ball beneath water lubrication, W = two.6 10-9 mm3 /(Nm), is substantially lower than the wear price W = three.eight 10-8 mm3 /(Nm) in ambient air. However, the friction coefficient v = 0.14 is twice higher in water-lubricated sliding, as shown in Figure two. The observed inconsistency amongst the higher friction and low put on functionality beneath water lubrication along with the reduce friction and high put on overall performance in humid air becomes understandable when the mechanism of friction in DLN films controlled by the transfer film formation [11,12] is taken into consideration. For hydrogenated DLC films, the presence of graphitized transfer layers on the surface of counterface materials is referred to as one particular of major factors to influence the frictional behavior in the coatings [37,38]. Below water lubrication, the formation on the graphitized transfer film (responsible for the low friction in ambient air) is difficult because of the very low put on rate in the film surface, resulting inside the elevated friction in the course of sliding. Note, the COF values for the duration of sliding in water had been reduce at CRISPR/Cas9| greater loads [8,9], and strongly depended on the structure of Si-containing DLC films when tribochemical layers formation resulted in super low friction performance [39] (not observed in our experiments). In contrast towards the DLN-Si3 N4 friction pair, the put on qualities on the DLN-steel pair weren’t improved in water-lubricated sliding. The put on rates with the DLN film were comparable in humid air and water environments: W = five 10-7 mm3 /(Nm) and W = 4.eight 10-7 mm3 /(Nm), respectively. The wear price on the steel ball enhanced in the W = five.5 10-8 mm3 /(Nm) in humid air towards the W = two.eight 10-7 mm3 /(Nm) beneath water, which was triggered by corrosion of steel referred to as a detrimental procedure for the DLC-steel contacts [40] in water atmosphere. The observed friction and put on efficiency with the DLN films in water can be called superior compared to standard a-C:H films which had been reported to become speedily removed in the substrate throughout water-lubricated tests [40]. Typically, the obtained final results have demonstrated theCoatings 2021, 11,put on rates in the DLN film have been comparable in humid air and water environments: W = five 10-7 mm3/(Nm) and W = four.8 10-7 mm3/(Nm), respectively. The put on rate of the steel ball increased in the W = 5.five 10-8 mm3/(Nm) in humid air towards the W = 2.eight 10-7 mm3.
