Effect of Cu-Doped Carbon Quantum Dot Dispersion Liquid on the Lubrication Performance of Polyethylene Glycol

Liu, Shu‐Sheng; Yu, Xiuqian; Hu, Enzhu; Su, Enhao; Chen, Yanjie; Wang, Jianping; Hu, Kunhong; Xu, Yong; Hu, Xianguo; Zhong, Hexiang

doi:10.3390/lubricants11020086

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…To improve energy efficiency and reduce resource consumption of bearings and other critical materials in high-end equipment, many scientists have used "copper" as a raw material for synthetic modification of other lubricating materials. Liu et al [178] successfully synthesized a new type of copper-carbon quantum dot dispersions (Cu-CQDs) (Figure 8) with a lubricating function by hydrothermal reaction using glycerol, choline chloride, and copper chloride dihydrate as raw materials. They tested the effect of dispersions containing Cu-CQDs nanoparticles on the lubrication properties of polyethylene glycol (PEG200) bearing materials by testing them on a four-ball friction tester, which concluded that the synthesized Cu-CQDs have an average particle size of about 8.33 nm and that their application in dispersions significantly enhanced the lubrication properties of PEG.…”

Section: Analysis Of Wind Power Bearing Lubrication Research Based On...mentioning

confidence: 99%

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

Peng,

Zhao,

Shangguan

et al. 2023

Coatings

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With the significant penetration of wind generation, wind turbines require higher and higher lubrication performance for bearings. To improve the lubrication performance of wind power bearings, this study takes wind power bearings as the research object and comprehensively analyzes the wear forms of wind power bearings as well as intelligent lubrication methods. Firstly, the main roles and wear forms of wind turbine bearings are sorted out and analyzed. Secondly, the common lubrication problems of wind power bearings are analyzed from the bearing grease selection, lubrication mode, and lubrication status, highlighting the important influence of lubrication on bearings. Thirdly, the wind turbine bearing wisdom lubrication method research and organization, mainly including the wind power generation bearing lubrication materials, lubrication devices and monitoring methods, and other issues of research and analysis. Finally, current challenges and future development directions are summarized, which are designed to provide theoretical reference and technical support for the related research and engineering practice in the field of wind power engineering.

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Section: Analysis Of Wind Power Bearing Lubrication Research Based On...mentioning

confidence: 99%

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

Peng,

Zhao,

Shangguan

et al. 2023

Coatings

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“…The element of the transition layer of the Ti−coated diamond and the copper element continuously infiltrated each other during cyclic wear, as shown in Figure 14. Under the hindrance of the diamond, the copper chips were observed to be ground into nano−scale, which helped to improve the wear resistance of the composite coating [32]. The transition layer on the surface of the diamond was worn, but the diamond was still tightly embedded in the matrix and tightly bonded.…”

Section: Wear-resistant Propertymentioning

confidence: 99%

Tribological Behavior of Ti-Coated Diamond/Copper Composite Coating Fabricated via Supersonic Laser Deposition

Zhang

Chen

et al. 2023

Lubricants

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Diamond/copper composite coating is promising for wear-resistant applications, owing to the extreme hardness of the diamond reinforcement. Ti-coated diamond/copper composite coatings with various laser powers were successfully fabricated employing the novel manufacturing technology of supersonic laser deposition (SLD). Ti-coated diamond, which was able to enhance the wettability between diamond and copper, was prepared at the optimal parameters via salt bath. Nano-spherical titanium carbides were uniformly distributed on the diamond’s surface to generate a favorable interface bonding with a copper matrix though mechanical interlocking and metallurgical bonding during impact. Furthermore, the results showed that the transition layer acted as a buffer, preventing the breakage of the diamond in the coating. SLD can prevent the graphitization of the diamonds in the coating due to its low processing temperature. The coordination of laser and diamond metallization significantly improved the tribological properties of the diamond/copper composite coatings with the SLD technique. The microhardness of the diamond/copper composite coating at a laser power of 1000 W reached about 172.58 HV0.1, which was clearly harder than that of the cold sprayed copper. The wear test illustrated that the diamond/copper composite coating at a laser power of 1000 W exhibited a low friction coefficient of 0.44 and a minimal wear rate of 11.85 μm3·N−1·mm−1. SLD technology shows great potential in the field of preparing wear-resistant hard reinforced phase composite coatings.

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Carbon Dots as Ligand Operons to Expand Cluster Size Distribution for High Load‐bearing Liquid Superlubricity

Liang,

Liu,

Yin

et al. 2024

Adv Funct Materials

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Adding additives (e.g., carbon dots, CDs) to liquid lubricants is an effective method for enhancing their load‐bearing capacity and friction reduction. However, it is challenging to simultaneously impart high load‐bearing capacity and superlubricity for them (e.g., ionic liquid analogs, ILAs) through this strategy due to strong Coulombic interactions. With CDs as a competing ligand operon, the cluster size distribution can be expanded, conferring superlubricity with ultrahigh load‐bearing capacity (>705 MPa, the highest value of CDs‐based superlubricious materials thus far) for CDs/ILAs. In particular, methodologies such as Raman, 1H‐NMR, fourier transform infrared spectroscopy, and laser particle size analysis are employed to characterize the evolution of their H‐bonding interactions and particle size distribution. CDs can act as competing ligands and enable CDs/ILAs to form systems with ultra‐low coefficient of friction and wear consisting of a mixture of large and small clusters. The mixed and expanded size clusters facilitate the reduction of the viscosity for CDs/ILAs under shear, thereby reducing the interfacial shear resistance during superlubricity, while the CDs within them efficiently transfer the normal bearing loads. The progress is made from the perspective of cluster particle size distribution rather than individual additive properties, providing a new avenue for designing ILAs‐based superlubricious materials.

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Effect of Cu-Doped Carbon Quantum Dot Dispersion Liquid on the Lubrication Performance of Polyethylene Glycol

Cited by 4 publications

References 36 publications

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

Tribological Behavior of Ti-Coated Diamond/Copper Composite Coating Fabricated via Supersonic Laser Deposition

Carbon Dots as Ligand Operons to Expand Cluster Size Distribution for High Load‐bearing Liquid Superlubricity

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