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Summarized in Figure four.four. The wear rate values would be the averaged values under water are summarized in Figure The put on price values would be the averaged values of of tribotests performed for every sliding situation. By far the most pronounced impact of your 22 tribotests performed for each sliding condition. The most pronouncedeffect on the aqueous atmosphere around the put on behavior was observed inside the sliding tests against the aqueous environment on the put on behavior was observed in the sliding tests against the Si3 N ball, as shown in Figure 3a . The wear in the DLN film beneath water lubrication is Si3N4 four ball, as shown inFigure 3a . The put on with the DLN film under water lubrication is extremely low in comparison to the friction tests in humid air, as straight follows from comparison quite low in comparison with the friction tests in humid air, as directly follows from comparison on the put on track profiles in Figure 3a. The put on price on the DLN film beneath water lubrication amounts to W = 7.5 10-9 mm3 /(Nm), two orders of magnitude reduce than the put on rate W = 6.eight 10-7 mm3 /(Nm) from the film in humid air, see Figure four. Additionally, the put on rate on the Si3 N4 ball beneath water lubrication, W = two.6 10-9 mm3 /(Nm), is substantially lower than the put on rate W = 3.8 10-8 mm3 /(Nm) in ambient air. Nevertheless, the friction coefficient v = 0.14 is twice greater in water-lubricated sliding, as shown in Figure two. The observed inconsistency between the higher friction and low wear efficiency below water lubrication and also the reduce friction and higher put on overall performance in humid air becomes understandable when the mechanism of friction in DLN films controlled by the Oxotremorine sesquifumarate Agonist transfer film formation [11,12] is taken into consideration. For hydrogenated DLC films, the presence of graphitized transfer layers on the surface of counterface components is generally known as one particular of big things to influence the frictional behavior on the coatings [37,38]. Beneath water lubrication, the formation of your graphitized transfer film (responsible for the low friction in ambient air) is difficult as a result of the very low put on price with the film surface, resulting in the enhanced friction throughout sliding. Note, the COF values throughout sliding in water have been reduced at higher loads [8,9], and strongly depended around the structure of Si-containing DLC films when tribochemical layers formation resulted in super low friction functionality [39] (not observed in our experiments). In contrast to the DLN-Si3 N4 friction pair, the wear qualities of your DLN-steel pair 1-Methylpyrrolidine-d8 custom synthesis weren’t enhanced in water-lubricated sliding. The wear rates on 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 put on rate of your steel ball enhanced in the W = 5.5 10-8 mm3 /(Nm) in humid air towards the W = 2.8 10-7 mm3 /(Nm) below water, which was brought on by corrosion of steel called a detrimental course of action for the DLC-steel contacts [40] in water atmosphere. The observed friction and wear overall performance on the DLN films in water can be referred to as superior in comparison to standard a-C:H films which were reported to be promptly removed in the substrate for the duration of water-lubricated tests [40]. Usually, the obtained results have demonstrated theCoatings 2021, 11,wear rates from the DLN film have been comparable in humid air and water environments: W = five 10-7 mm3/(Nm) and W = four.eight 10-7 mm3/(Nm), respectively. The wear price of the steel ball increased from the W = 5.five 10-8 mm3/(Nm) in humid air to the W = two.8 10-7 mm3.