Tribological effects of fullerene (C60) nanoparticles added in mineral lubricants according to its viscosity |
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| Authors: | Bon-Cheol Ku Young-Chul Han Jung-Eun Lee Jae-Keun Lee Sang-Ho Park and Yu-Jin Hwang |
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| Affiliation: | (1) Department of Mechanical Engineering, Pusan National University, San 30, Jangjeon-dong, Geumjung-gu, Busan, 609-735, Korea;(2) Department of Nanosystem and Nanoprocess Engineering, Pusan National University, San 30, Jangjeon-dong, Geumjeong-gu, Busan, 609-735, Korea; |
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| Abstract: | In this study, the tribological behaviors of fullerene nanoparticles-added mineral oil were investigated as a function of
viscosities (e.g., 12, 30, 55, 96 and 145 mm2/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 and the friction coefficient, and interpreted in terms of the Stribeck curve. We note that the
weld points of the raw- and nano-oil increased as the oil viscosity increased and weld points for 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. |
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