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Nanomaterials 2020, 10, 200 6 of 12 Nanomaterials 2020, 10, 200 6 of 13 Figure 4. (a) The ball wear scar map pure base oil; (b) EDS pattern of pure base oil; (c) 0.1 wt.% MoS2 Figure 4. (a) The ball wear scar map pure base oil; (b) EDS pattern of pure base oil; (c) 0.1 wt.% MoS2 QDs; (d) 0.2 wt.% MoS2 QDs; (e) 0.3 wt.% MoS2 QDs; (f) 0.5 wt.% MoS2 QDs. QDs; (d) 0.2 wt.% MoS2 QDs; (e) 0.3 wt.% MoS2 QDs; (f) 0.5 wt.% MoS2 QDs. To further investigate the wear mechanism, the SEM images of worn surfaces of the lower disc To further investigate the wear mechanism, the SEM images of worn surfaces of the lower disc samples lubricated by pure paroline oil and the paroline oil samples containing 0.1–0.5 wt.% MoS2 samples lubricated by pure paroline oil and the paroline oil samples containing 0.1–0.5 wt.% MoS2 QDs were investigated (Figure 5). It can be seen from Figure 5a,b that there was obvious ploughing QDs were investigated (Figure 5). It can be seen from Figure 5a,b that there was obvious ploughing and some pits on the worn track, which were due to the local second rupture of debris during the and some pits on the worn track, which were due to the local second rupture of debris during the sliding process; moreover, the friction of the debris at the sliding interface led to clear furrows on the sliding process; moreover, the friction of the debris at the sliding interface led to clear furrows on the worn surface. Figure 5c,d show that the worn surface presented finer mesh-like grooves, in agreement worn surface. Figure 5c,d show that the worn surface presented finer mesh-like grooves, in with the COF results in Figure 3. For the 0.3 wt.% sample, the worn surface was covered by fine agreement with the COF results in Figure 3. For the 0.3 wt.% sample, the worn surface was covered grooves and detachments after the sliding test, as shown in Figure 5e,f, and the wear mechanism by fine grooves and detachments after the sliding test, as shown in Figure 5e,f, and the wear was dominated by microploughing. Furthermore, it can be seen from Figure 5g that the wear scratch mechanism was dominated by microploughing. Furthermore, it can be seen from Figure 5g that the waws eaalrmsocrsatticnhvwisaisblael;mfoslltoinwviinsigblteh;efollolocwalinzgoothme lioncaFligzouorem5ifn, Foingluyresl5igf,hotnfluyrsrloigwhtsfcuoruroldwsbceooubldsebreved. Thoisbsisermveods.tlTyhaisttirsibmuotsetdlytaottrhiebuintecdretaosteheininMcroeSaseQinDMs,owSh2 QicDhsc,owuhldicrhecdoucledtrheeduwceatrheofwtehaerforfictthieonal intferrifcaticoensa.lTihnitserinfadciecsa.teTshtishaitndMicoaStesQtDhastpMlayoSe2dQaDlusbprilcaayteindgarolulebarincdatipnrgevreonleteadntdhepprelvoeungtheidngthweear 2 2 ploughing wear in the sliding process. The above results are in agreement with the tribological result in the sliding process. The above results are in agreement with the tribological result showing the showing the decrease in friction coefficient in Figure 3. decrease in friction coefficient in Figure 3.PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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