Synergistic Effect of MoS2 and SiO2 Nanoparticles as Lubricant Additives for Magnesium Alloy–Steel Contacts
Abstract
:1. Introduction
2. Experimental
2.1. Materials
2.2. Friction and Wear Tests
2.3. Worn Surface Analysis
3. Results and Discussion
3.1. Friction and Wear Performances
3.2. The Capacity of Carrying Load
3.3. Lubrication-Film Stability
3.4. FESEM and XPS Analyses of the Worn Surfaces
3.5. Lubrication Mechanism of SiO2/MoS2 Hybrid Nanolubricants
4. Conclusions
- (1)
- 1.0 wt % MoS2 nanolubricants, 0.1 wt % SiO2 nanolubricants, and SiO2/MoS2 hybrid nanolubricants presented superior friction-reducing and anti-wear behaviors as well as a high load-carrying capacity. The optimal friction reducing and anti-wear capability was obtained for the combinative addition of 1.0 wt % nano-MoS2 and 0.1 wt % nano-SiO2 into the base oil.
- (2)
- 0.1 wt % SiO2 mixed with 1.0 wt % nano-MoS2 addition into the base oil showed a 21.8% reduction in the friction coefficient and 8.6% reduction in the wear volume compared with the 1.0 wt % MoS2 nanolubricants.
- (3)
- Under the lubrication of the SiO2:MoS2 (0.1:1.0) hybrid nanolubricants, a complex tribo-chemical film that mainly contains MoO3 and MgSO4 through chemical reaction plus the absorbed nanomaterial which is from the lubricant additive itself is generated on the worn surfaces.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Primary Characteristics | Kinematic Viscosity (40 °C) | Density (15 °C) | Content of Saturates | Content of Aromatics | Contents of Sulfur |
---|---|---|---|---|---|
EOT5# lubricant oil | 5.11 mm2/s | 0.856 g/cm3 | >90% | <1% | <0.03% |
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Xie, H.; Jiang, B.; Hu, X.; Peng, C.; Guo, H.; Pan, F. Synergistic Effect of MoS2 and SiO2 Nanoparticles as Lubricant Additives for Magnesium Alloy–Steel Contacts. Nanomaterials 2017, 7, 154. https://doi.org/10.3390/nano7070154
Xie H, Jiang B, Hu X, Peng C, Guo H, Pan F. Synergistic Effect of MoS2 and SiO2 Nanoparticles as Lubricant Additives for Magnesium Alloy–Steel Contacts. Nanomaterials. 2017; 7(7):154. https://doi.org/10.3390/nano7070154
Chicago/Turabian StyleXie, Hongmei, Bin Jiang, Xingyu Hu, Cheng Peng, Hongli Guo, and Fusheng Pan. 2017. "Synergistic Effect of MoS2 and SiO2 Nanoparticles as Lubricant Additives for Magnesium Alloy–Steel Contacts" Nanomaterials 7, no. 7: 154. https://doi.org/10.3390/nano7070154