期刊
TRIBOLOGY INTERNATIONAL
卷 165, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107250
关键词
Fluorinated graphene; PTFE; Extreme pressure; Tribological performance
资金
- National Natural Science Foundation of China [51805518, 51975562]
This study demonstrates that fluorinated graphene performs better in tribological performance and lubrication mechanism under extreme-pressure conditions compared to polytetrafluoroethylene, mainly due to the higher reactivity of the C-F bond and adsorption ability of the two-dimensional carbon-skeleton.
Taking fluorinated graphene (FG) and polytetrafluorethylene (PTFE) as the typical models, this work aims to clarify the influences of carbon-skeleton structure and C-F bond strength on their tribological performance and lubrication mechanism under extreme-pressure condition. As oil additives, the load-bearing capacity of PAO-6 increases from 300 N to 600 N with FG and 400 N with PTFE. Compared with the situation with the PTFE sub-microspheres, the wear rate of PAO-6 with FG nanosheets reduces by about 40%. Proved by the apparent difference in tribofilm formation ability of FG and PTFE, it is believed that the higher reactivity of the C-F bond and adsorption ability of two-dimensional carbon-skeleton play a crucial role in FG's excellent tribological performance.
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