Role of carbon nanotubes on growth of a nanostructured double-deck tribofilm yielding excellent self-lubrication performance
| Autor: | Ga Zhang, Yufeng Guo, Hao Li, Guitao Li, Qinglun Che, Jianjun Zhang, Ligang Zhang, Fuyan Zhao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanostructure Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry Polymer Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry Chemical engineering law Lubrication General Materials Science Cubic zirconia 0210 nano-technology Carbon Layer (electronics) |
| Zdroj: | Carbon. 161:445-455 |
| ISSN: | 0008-6223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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