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Research Article | Open Access | Just Accepted

Influence of external magnetic field on the tribological performance of magnetic fluids in different lubrication regimes

Xiaoyu Wang1,2Yan Zhao1,3Huanchen Liu1Xiaobo Wang1,3Wenjing Lou1,3()Jun Yang1()

1 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

2 University of Chinese Academy of Sciences, Beijing 100049, China

3 Qingdao Key Laboratory of Lubrication Technology for Advanced Equipment, Qingdao Center of Resource Chemistry & New Materials, Qingdao 266100, China

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Abstract

Magnetic fluids (MFs) represent a unique class of smart functional lubricating material, with their physical properties tunable by the application of a magnetic field. In this study, stable MFs were prepared at varying mass fractions of Fe3O4 nanoparticles. The influence of magnetic field on their tribological behaviors was examined on a modified rotational rheometer in both boundary and mixed lubrication regimes. The results show that the magnetic field significantly enhance the tribological performance of the MFs, especially for boundary lubrication. In particular for the MF containing 1wt% Fe3O4 nanoparticles, a friction reduction of 41.2% and a wear volume reduction of 94.7% were achieved in the presence of magnetic field. Post-analysis of the worn surfaces was carried out with multiple techniques to gain deeper insights into the lubrication mechanisms. In boundary lubrication regime, the magnetic field aids in introducing a larger amount of Fe3O4 nanoparticles into the contact, leading to the formation of a more continuous deposit film.

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Cite this article:
Wang X, Zhao Y, Liu H, et al. Influence of external magnetic field on the tribological performance of magnetic fluids in different lubrication regimes. Friction, 2024, https://doi.org/10.26599/FRICT.2025.9440979
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