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Nanomaterials 2020, 10, 200 5 of 13 relevant tribological mechanism is due to the MoS2 QDs particles at higher concentration accumulating in the inlet of the ball-on-disc contact area, which causes an insufficient supply of lubricant and starvation in the contact zone [25]. The running-in period is of great significance to the regulation of tribological performance to a certain extent. Reducing the running-in period is beneficial Nanomaterials 2020, 10, 200 5 of 12 to improving the anti-frictional property. The formation of a boundary lubrication film is the main reason for the stability of the friction coefficient. Figure 3d shows the variation of running-in time Figwuriteh3tdhsehaodwdsittiohnevoafrMiaotiSo2nQoDfsru.Tnhneinrgu-binbitnimgepewriothdtohfenaadndoi-toioilnwoifthM0o.S12wQt.D%s.coTnhceernutrbabtinongplaesrtieodof nanlon-ogielrwtihtahn0.t1hewto.t%hecrosn,cweinthtratitoinmleasotfed46l0onsg.eIrnthadandithioeno,tihteirss,nwotiethwaorttihmyetohfa4t6t0hes.rIunbabdindgititoimn,eitis notoebwvoioruthslythdaectrtehaeserdubwbitnhgthimeeinocbrevaisoeusinlycdoencreenatsreatdiown.itAhltheouingchretahsee0in.5cwont.c%enstarmatpiolen.hAadlththoeugh shortest rubbing time in terms of friction property, the corresponding average COF was slightly the 0.5 wt.% sample had the shortest rubbing time in terms of friction property, the corresponding higher than that of the 0.3 wt.% oil sample under the same conditions. average COF was slightly higher than that of the 0.3 wt.% oil sample under the same conditions. Figure 3. (a) Tribological tests results of paraffin oils with different additive amounts of MoS2 QDs; Figure 3. (a) Tribological tests results of paraffin oils with different additive amounts of MoS2 QDs; (b) coefficient of friction (COF) for different additive amounts of MoS2 QDs; (c) average COF and COF (b) coefficient of friction (COF) for different additive amounts of MoS2 QDs; (c) average COF and COF in steady state after rubbing; (d) the change in rubbing time at different concentrations. in steady state after rubbing; (d) the change in rubbing time at different concentrations. 3.3. Wear Scar Images of Balls and Discs Figure 4 reveals the wear scar maps of the tested balls sliding against the bearing steel discs. Figure 4 reveals the wear scar maps of the tested balls sliding against the bearing steel discs. It 3.3. Wear Scar Images of Balls and Discs It shows that the wear degree of the samples containing MoS2 QDs was obviously improved, compared shows that the wear degree of the samples containing MoS2 QDs was obviously improved, compared to that of the paroline base oil. When the base oil was a lubricant, the worn surface of the ball presented to that of the paroline base oil. When the base oil was a lubricant, the worn surface of the ball a black sediment, which confirmed that the main component was Fe, resulting from ball-on-disc presented a black sediment, which confirmed that the main component was Fe, resulting from ball- milling, as shown in Figure 4b (EDS). Moreover, the 0.1 wt.% and 0.2 wt.% samples also presented black on-disc milling, as shown in Figure 4b (EDS). Moreover, the 0.1 wt.% and 0.2 wt.% samples also sediment, but the wear radiuses were visibly reduced. In particular, the radius of 0.3 wt.% MoS2 QDs presented black sediment, but the wear radiuses were visibly reduced. In particular, the radius of 0.3 was smaller than that of the other samples, showing the superior anti-wear performance of MoS2 QDs wt.% MoS2 QDs was smaller than that of the other samples, showing the superior anti-wear at this specific percentage. Although the 0.5 wt.% oil sample had a lower COF value in the stabilized performance of MoS2 QDs at this specific percentage. Although the 0.5 wt.% oil sample had a lower state after rubbing, the corresponding steel ball sliding with the disc had a higher wear rate. COF value in the stabilized state after rubbing, the corresponding steel ball sliding with the disc had a higher wear rate.PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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