Summarized in Figure 4.4. The wear price values are the averaged values under water are summarized in Figure The put on rate values are the averaged values of of tribotests performed for every single sliding situation. One of the most pronounced effect of your 22 tribotests performed for every sliding situation. By far the most pronouncedeffect on the aqueous atmosphere around the put on behavior was observed in the sliding tests against the aqueous atmosphere around the put on behavior was observed in the sliding tests against the Si3 N ball, as shown in Figure 3a . The wear on the DLN film beneath water lubrication is Si3N4 4 ball, as shown inFigure 3a . The put on in the DLN film beneath water lubrication is quite low compared to the UCL 1684 dibromide Protocol friction tests in humid air, as directly follows from comparison really low in comparison with the friction tests in humid air, as straight follows from comparison with the wear track profiles in Figure 3a. The put on price in the DLN film beneath water lubrication amounts to W = 7.five 10-9 mm3 /(Nm), two orders of magnitude reduce than the wear rate W = 6.8 10-7 mm3 /(Nm) from the film in humid air, see Figure 4. Also, the wear price of your Si3 N4 ball beneath water lubrication, W = 2.6 10-9 mm3 /(Nm), is considerably lower than the put on price W = three.8 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 between the higher friction and low wear efficiency under water lubrication and also the lower friction and higher wear efficiency in humid air becomes understandable in the event 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 Azvudine HCV surface of counterface components is known as one particular of major variables to influence the frictional behavior of the coatings [37,38]. Under water lubrication, the formation of the graphitized transfer film (responsible for the low friction in ambient air) is complex as a result of the extremely low put on price on the film surface, resulting inside the increased friction throughout sliding. Note, the COF values for the duration of sliding in water had been reduced at higher loads [8,9], and strongly depended on the structure of Si-containing DLC films when tribochemical layers formation resulted in super low friction efficiency [39] (not observed in our experiments). In contrast for the DLN-Si3 N4 friction pair, the wear qualities with the DLN-steel pair weren’t enhanced in water-lubricated sliding. The wear prices on the DLN film had been comparable in humid air and water environments: W = five 10-7 mm3 /(Nm) and W = 4.8 10-7 mm3 /(Nm), respectively. The wear price of the steel ball increased from the W = five.five 10-8 mm3 /(Nm) in humid air towards the W = two.8 10-7 mm3 /(Nm) under water, which was triggered by corrosion of steel referred to as a detrimental method for the DLC-steel contacts [40] in water atmosphere. The observed friction and wear overall performance with the DLN films in water is often known as superior in comparison with conventional a-C:H films which were reported to become promptly removed from the substrate in the course of water-lubricated tests [40]. Frequently, the obtained final results have demonstrated theCoatings 2021, 11,put on rates of your DLN film had been 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.
