Abstract
Molybdenum disulfide quantum dots (MoS2 QDs) are a promising lubricant additive for enhanced engine efficiency. In this study, MoS2 QDs were used as lubricating oil additives for ball-on-disc contact and had adequate dispersity in paroline oil, due to their super small particle size (~3 nm). Tribological results indicate that the friction coefficient of paroline oil with 0.3 wt.% MoS2 QDs reached 0.061, much lower than that of pure paroline oil (0.169), which is due to the formation of a stable tribo-film formed by the MoS2, MoO3, FeS, and FeSO4 composite within the wear track. Synergistic lubrication effects of the tribo-film and ball-bearing effect cooperatively resulted in the lowest friction and wear.
Highlights
Friction and wear between moving components have an important influence on the energy loss of engineering equipment [1,2,3]
This study aims to investigate the tribological performance of MoS2 quantum dots (QDs) as a lubricant additive in paroline oil
With the addition of MoS2 QDs to the paraffin oil, the lowest COF of 0.061 could be obtained by the 0.3 wt.% MoS2 QD oil sample, which dropped by approximatively 64% compared to the pure paraffin base oil
Summary
Friction and wear between moving components have an important influence on the energy loss of engineering equipment [1,2,3]. Lubrication technology is of great significance to improve the tribological properties and reduce the wear of friction pairs [4,5]. Lubricant additives can reduce friction loss and conservation resources [8]. Lubricant additives for lubricating oil are widely used to improve durability of frictional components [9]. The tribological property of nanoparticle additives attracted a great deal of attention, as they show friction-reducing and anti-wear effects to a certain level. Lubricant additives were extensively studied in the past few years, such as MoS2 nanosheets [11], MoS2 nanotubes [12], fullerene-like MoS2 [13], and grapheme [14]
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