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Understanding the Physical Adsorption Action Mechanism of MoS2 Nanoparticles in Boundary Lubrication with Different Polyisobutyleneamine Succinimide (PIBS) Concentrations

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Abstract

The lubrication mechanism of nanoinorganic particles during friction process has been widely investigated. However, the physical adsorption action mechanism between the nanoparticles (after modification) and friction pairs has so far never been studied in detail. In this study, the various concentrations of polyisobutyleneamine succinimide (PIBS) by weight in paraffin oil were applied to study their effect on the tribological behaviors of nano-MoS2 oil. And the tribological results were further discussed to understand the lubricating action mechanism of nano-MoS2 particles additive. The results show that the tribological behavior of modified nanoparticles was significantly influenced by PIBS concentration. The COF reduced from 0.139 to 0.090 with low PIBS concentration (less than 0.1 wt%), while the COF reduced to 0.126 with higher PIBS concentration (more than 0.2 wt%). By scanning electron microscopic (SEM) and energy-dispersive X-ray spectroscopy, some mechanisms likely related to this interesting results are revealed. It is identified that: (1) production of MoS2 tribofilm on steel surface reduces the COF and wear, (2) wear scar is smooth with low PIBS concentration, while it shows plowing wear with high PIBS concentration, (3) the MoS2 tribofilm is found by SEM on the wear scar of the nano oil with 0.05 wt% PIBS. A three-step lubricating action mechanism of the modified nano-MoS2 particles has been proposed as an explanation for the interesting results. The results indicate that physical adsorption provide an initial action for nanoparticle lubricant to form tribofilm in boundary lubrication.

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Acknowledgments

The project was supported by the School-Enterprise Cooperation Project (Grant No. 20130412).

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Authors and Affiliations

  1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Hongxing Wu, Liguo Qin, Qunfeng Zeng & Guangneng Dong

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  1. Hongxing Wu
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  2. Liguo Qin
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  3. Qunfeng Zeng
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  4. Guangneng Dong
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Correspondence to Guangneng Dong.

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Wu, H., Qin, L., Zeng, Q. et al. Understanding the Physical Adsorption Action Mechanism of MoS2 Nanoparticles in Boundary Lubrication with Different Polyisobutyleneamine Succinimide (PIBS) Concentrations. Tribol Lett 60, 26 (2015). https://doi.org/10.1007/s11249-015-0604-4

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