期刊
CARBON
卷 156, 期 -, 页码 272-281出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.09.055
关键词
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资金
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN201801432]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0755]
- National Natural Science Foundation of China [51705508]
- Open Project of State Key Laboratory of Solid Lubrication [LSL-1706]
As a new type of carbon material, carbon dots (CDs) with exceptional properties are regarded as a type of potential water-based lubricant additive. In this study, it is first demonstrated that CDs perform excellently when used as lubricant additives for water-lubricated amorphous carbon (a-C) contacts. The results show that the introduction of CDs into water at a concentration of 0.1 wt% could reduce friction and wear in a-C contacts by 33% and 80%, respectively. Additionally, the lubricating performance of CDs is highly sensitive to its adding concentration. The excellent tribological performance of CDs results from the minimized CDs sediment particles (deposited in situ on worn a-C surfaces) and the reduced friction and wear via nano-bearing and nano-filling mechanisms. With high CDs concentrations, however, micron and submicron-sized sediment particles form when friction occurs and cause undesirable abrasive wear. For water-lubricated a-C contacts, therefore, the CDs concentration is the crucial determinant of lubrication performance that has to be appropriately controlled. (C) 2019 Elsevier Ltd. All rights reserved.
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