Abstract
Here we report the tribological properties of nanosized onion-like carbon (OLC), OLC-nanodiamond (ND), and OLC-graphene oxide (GO) as additives in lubricant oil tested under different wear pressure. Under the wear pressure of 588 N of the four-ball testing, the 0.125 wt% addition OLC reduced the wear volume and the wear scar diameter by 36.29 % and 82.42 %. TEM characterization revealed structural changes in contour of the OLC particles after the wear testing. Pressure-induced agglomeration was seen for the OLC nanospheres, and the squeezed lattice changes resulted in formation of sp3 diamond structure inside the spheres. These structural changes are directly related to the loading force. However, addition of the sp3 NDs and sp2 GO deteriorated the lubricating performances of the OLC-added lubricant oil.
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