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Hybrid nano-materials offer potential scope for an increasing numerous novel applications when engineered to deliver availably functional properties. In the present study, the SiO 2 /MoS 2  hybrid nanoparticles with different mass ratios were employed as lubricant additives in the base oil, and their tribological properties were evaluated using a reciprocating ball-on-plate tribometer for magnesium alloy-steel contacts. The results demonstrate that the SiO 2 /MoS 2  hybrid nanoparticles exhibit superior lubrication performances than individual nano-SiO 2  or nano-MoS 2  even in high load and diverse velocity cases. The optimal SiO 2 /MoS 2  mixing ratio and the concentration of SiO 2 /MoS 2  hybrid nanoparticles in the base oil are 0.25:0.75 and 1.00–1.25 wt%, respectively. The excellent lubrication properties of the SiO 2 /MoS 2  hybrid nanoparticles are attributed to the physical synergistic lubricating actions of nano-SiO 2  and nano-MoS 2  during the rubbing process.

An Investigation on the Tribological Performances of the SiO2/MoS2 Hybrid Nanofluids for Magnesium Alloy-Steel Contacts