Journal
CARBON
Volume 161, Issue -, Pages 445-455Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.01.091
Keywords
MWCNTs; ZrO2 nanoparticles; Double-deck tribofilm; Self-lubrication; Wear resistance
Funding
- National Key Research and Development Program of China [2017YFB0310703]
- National Natural Science Foundation of China [51875552, 11622218, 11972186]
- Key Research and Development Program of Shangdong [2019GSF109094]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Multi-walled carbon nanotubes (MWCNTs), and MWCNTs/zirconia nanoparticles (nano-ZrO2) hybrids were compounded into a formulated non-asbestos brake material of phenolic binder, respectively. It is demonstrated that even low-loading above nanofillers switching virtually the original brake material to an extremely wear-resistant self-lubricating material. More interestingly, the addition of MWCNTs/nano-ZrO2 hybrids leads to formation of a double-deck tribofilm yielding extraordinarily low friction and wear. First-principles calculations demonstrate that O atoms from air ambience break carbon-carbon backbones of CNTs, facilitating them to convert into graphitic nanograins. Our work provides direct evidence that graphitic nanograins and nano-ZrO2 are digested within the beneath layer of the tribofilm, whilst chelation of polymer chains radicals with nano-ZrO2 expedites formation of a carbon-based lubricous top layer. The present work puts forward a new strategy for endowing numerous mechanical motion systems with a robust self-lubrication characteristic via tuning tribofilms' nanostructures. (C) 2020 Elsevier Ltd. All rights reserved.
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