Abstract
Poor lubrication performance of low-sulfur fuel leads to increased wear of diesel engine components. In order to improve the lubrication properties of low-sulfur fuel, we successfully prepared graphene lubricant additives by dielectric barrier discharge plasma-assisted ball milling. The tribological properties of graphene lubricant additives in two types of 0# diesel oils with different sulfur content were evaluated by high-frequency reciprocating rig (HFRR). The results indicated that the expanded graphite was exfoliated and refined into graphene sheets with nine layers by the synergistic effect of the heat explosive effect of the discharge plasma, the impact of mechanical milling function, and the cavitation effect of 0# diesel oil. The organic functional groups of 0# diesel oil were successfully grafted on the surface of graphene sheets. The addition of 0.03 wt % graphene resulted in 20% reduction in the friction coefficient (COF) and 28% reduction in wear scar diameter (WSD) compared to pure 0# diesel oil with a sulfur content of 310 mg/kg. The addition of 0.03 wt % graphene resulted in 24% reduction in the friction coefficient (COF) and 30% reduction in wear scar diameter (WSD) compared to pure 0# diesel oil with a sulfur content of 1.1 mg/kg. The formation of graphene tribofilm on rubbing surfaces improved the lubrication properties of low-sulfur fuel.
Highlights
Published: 31 January 2021Sulfur oxides (SOX), which are the main pollutant of air pollution and environmental acidification, are part of exhaust emissions from marine diesel engines
Yan et al prepared surfacemodified nano-TiO2 powders of about 20 nm with quaternary ammonium salt and lauric acid sodium salt as surface modifier by DBDP-assisted ball milling for 11 h, and the results showed that plasma made quaternary ammonium salt and lauric acid sodium salt more prone to broken bonds and polymerization and promoted the surface modification of TiO2 powders, which were well dispersed in 40 CA (CA stands for diesel engine oil). marine lubricating oil and possessed excellent tribological properties [17]
Lubrication additives were obtained by DBDP-assisted ball milling for 10 h
Summary
Sulfur oxides (SOX), which are the main pollutant of air pollution and environmental acidification, are part of exhaust emissions from marine diesel engines. Soybean oil and other vegetable oils were researched as raw material to synthesize monoethanolamides as lubricating additives for low-sulfur marine fuel, and the average wear scar diameter (WS 1.4) was less than 520 μm when the concentration of monoethanolamides was 80–140 ppm [7]. In order to improve the lubrication properties of low-sulfur fuel, we prepared surface-modified graphene lubricant additives for low-sulfur fuel by DBDPassisted ball milling, with expanded graphite as raw material and 0# diesel oil as surface modifier. The tribological properties of graphene additives in 0# diesel oils with different sulfur content were investigated by high-frequency reciprocating rig (HFRR), and the mechanism of friction reduction and anti-wear was analyzed. This study can provide a method for improvement of low-sulfur fuel lubrication properties, which has important practical value for commercial application of graphene
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