The enhancement of wear properties of compressor oil using MoS2 nano-additives

MoS₂ nanoparticles have been considered valuable materials in lubricating applications due to their layered morphology. This work synthesized spherical MoS₂ nanoparticles that held many nanosheets through the hydrothermal method. The thickness of these sheets is between 10 and 25 nm, and their length is estimated to be about 200 nm. The effect of nanoparticles concentration on wear properties was investigated in this research. The four-ball test measured the wear performance of nano lubricants. The results showed that all nano lubricants had better wear performance than the base lubricant (Behran Compressor 68). However, molybdenum disulfide nanoparticles synthesized as nanosheets with a thickness of 10 nm had the best performance. At a concentration of only 0.05 wt-%, the resulting nano lubricant reduced the wear width and friction coefficient by about 50%. The thermal conductivity coefficient results also showed that nanoparticles increased this coefficient. As the lubricant temperature increases, the difference between the nano and base lubricant's thermal conductivity increases.