Tribological Effects of Fullerene (C60) Nanoparticles Added in Mineral Lubricants According to its Viscosity

In this study, the tribological behaviors of fullerene nonoparticles-added mineral oil were investigated as a function of viscosities (e g. 12. 30. 55. 96 and 145 mm(2)/s). Extreme pressure and anti-wear properties were evaluated using a four-ball tester: respectively. The lubrication tests were performed with a disk-on-disk tester for different normal loads. Tribological properties were evaluated by measuring friction surface temperature rind the friction coefficient. and intepreted in terms the Stribeck curve. We note that the weld points of the raw- and nano-oil increased as the oil viscosity increased and weld points tar all nano-oil were higher than those of raw oil. Also the wear scar diameters of the raw- and nano-oil decreased as the oil viscosity increased and wear scar diameters for all nano-oil were less than those of raw oil. Also, we have found that the difference of friction coefficient between raw oil and nano-oil was outstanding when the viscosity of raw oil was low and the normal load is high. Our results indicate that the addition of fullerene additives in lubricant was more effective when the viscosity of raw oil was low under the higher normal load conditions.