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

Abstract

Hybrid nano-materials offer potential scope for an increasing numerous novel applications when engineered to deliver availably functional properties. In the present study, the SiO2/MoS2 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 SiO2/MoS2 hybrid nanoparticles exhibit superior lubrication performances than individual nano-SiO2 or nano-MoS2 even in high load and diverse velocity cases. The optimal SiO2/MoS2 mixing ratio and the concentration of SiO2/MoS2 hybrid nanoparticles in the base oil are 0.25:0.75 and 1.00–1.25 wt%, respectively. The excellent lubrication properties of the SiO2/MoS2 hybrid nanoparticles are attributed to the physical synergistic lubricating actions of nano-SiO2 and nano-MoS2 during the rubbing process.

Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

“…The formation of tribo-film can reduce the coefficient of friction (COF) since some nanoparticles tend to be adsorbed or embedded on surfaces. The nanoparticles can also mend surface defects to improve the load capacity by lowering the local stress concentration in order to protect the surfaces against further catastrophic damage [ Gara et al, 2013, Sahoo et al, 2013, Battez et al, 2008, Yu et al, 2008, Xie et al, 2016, Luo et al, 2014.…”

“…Most of the previous research studies only considered the tribological characteristics of nanofluids on hard materials such as steel and cast iron [Gara et al, 2013, Sahoo et al, 2013, Battez et al, 2008, Xie et al, 2016. Few papers considered applications of nanofluids on relatively soft non-ferrous materials, such as copper, brass and aluminum.…”

Adverse effects of a hybrid nanofluid in a wavy non-uniform annulus with convective boundary conditions

“…Das et al 5 studied the nanouid ow of Al 2 O 3 /water and Cu-Al 2 O 3 /water hybrid nanouids in the presence of a magnetic eld in the transverse direction through a porous channel where they set a comparison of the heat enhancement level due to the suspension of aluminum and copper nanoparticles in waterbased nanouids as both a unitary and a hybrid nanouid. Xie et al 6 examined the tribological characteristics of the SiO 2 / MoS 2 hybrid nanoparticles by studying the friction coefficient and wear volume. They concluded that the hybrid nanouids attain a lower wear volume and friction coefficient when compared to those of pure nanouids.…”

A Study of Minimum Quantity Lubrication (MQL) by Nanofluids in Orbital Drilling and Tribological Testing

“…Nanofluids containing molybdenum disulfide (MoS 2 ), graphite, tungsten disulfide (WS 2 ), and other nanoparticles with a lamellar structure have also exhibited lower friction compared to the base fluid. The lower friction is attributed to solid lubrication by lamellar-structed nanoparticles, which provide an easy shearing surface between contacting surfaces [13,[18][19][20]. Additionally, MoS 2 nanoparticles in nanofluids have been shown to form a tribofilm, resulting in lowering friction, and to deagglomerate wear particles for reduced transfer films [21,22].…”