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The tribological properties of combinative addition of nano-MoS_2 and nano-SiO_2 to the base oil have been investigated with a reciprocating ball-on-plate tribotester for magnesium alloy–steel contacts. The results demonstrate that the optimum mass ratio of nano-SiO_2 to nano-MoS_2 is 0.25:0.75. The optimum combinative addition into the base oil reduces the friction coefficient by 43.8% and the surface roughness(Sa) by 31.7% when compared to that found with the base oil. Meanwhile, the combinative addition of nano-MoS_2 and nano-SiO_2, in comparison with single nanoparticles addition, is more pronounced in terms of the lubrication film stability. The excellent tribological properties of the SiO_2/MoS_2 combinations are attributed to the formation of physical adsorption films and tribochemical products during the rubbing process and the micro-cooperation of various nanoparticles with different shapes and lubrication mechanisms.
The tribological properties of combinative addition of nano-MoS_2 and nano-SiO_2 to the base oil have been investigated with a reciprocating ball-on-plate tribotester for magnesium alloy-steel contacts. The results demonstrate that the optimum mass ratio of nano-SiO_2 to nano-MoS_2 is 0.25: 0.75. The optimum combinative addition into the base oil reduces the friction coefficient by 43.8% and the surface roughness (Sa) by 31.7% when compared to that found with the base oil. Meanwhile, the combinative addition of nano -MoS_2 and nano-SiO_2, in comparison with single nanoparticles addition, is more pronounced in terms of the lubrication film stability. The excellent tribological properties of the SiO_2 / MoS_2 combinations are attributed to the formation of physical adsorption films and tribochemical products during the rubbing process and the micro-cooperation of various nanoparticles with different shapes and lubrication mechanisms.