Abstract
A high quality three dimensional graphene nanosheets (3D GNS) with few layers’ thickness was prepared by the arc-discharge method. The 3D GNS is used as oil additive to explore its tribological performance under different working conditions. The results demonstrate that with the help of 3D GNS, the anti-wear and friction-reduction capabilities of base oil are improved in a wide range of speed and load. Especially under low speed and heavy load condition (4.2 mm/s and 1.0 GPa contact pressure), the reduction in coefficient of friction and wear volume loss can be as high as 29.1% and 55%, respectively. Raman spectrum and its mapping together confirmed the existence of protective film consisted by 3D GNS on rubbing surface, which avoids the direct contact of tribo-pairs and thus enhances the tribological performance of oil. In the case of heavier load condition, the lubricating performance of 3D GNS was reduced owing to the deteriorated 3D structure of the GNS. For higher speed, the thicker oil film brings better tribological properties to oil and minute 3D GNS is needed to participate in the friction process. The results are in good agreement with the Stribeck curve prediction. In brief, 3D GNS is helpful for improving the tribological properties of base oil under low speed and heavy load; thus providing a new insight for practical application as lubricant additive.
Published Version
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