Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles
Abstract
:1. Introduction
2. Materials and Methods
2.1. Base Oil and Nanoparticles
2.2. Formulation of Nanolubricants
2.3. Thermophysical Characterization
2.4. Tribological Characterization
3. Results
3.1. Stability of the Dispersions
3.2. Thermophysical Results
3.3. Tribological Results
4. Conclusions
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- Good stability against sedimentation was achieved with SiO2 nanoparticles, coated with stearic acid and dispersed in a paraffinic base oil.
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- Friction coefficients found with the SiO2-SA nanolubricants are reduced in comparison with the neat G-III base oil.
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- The wear produced in the pins is lower than that found with G-III base oil; the optimal nanolubricant is the G-III base oil + 0.60 wt% SiO2-SA, with reductions of up to 21, 22, and 54% in terms of width, depth, and area, respectively.
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- The tribological lubrication mechanisms can be justified by the rolling and tribofilm formation of the SiO2-SA nanoparticles.
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- Before applying these nanolubricants in EVs, more studies are needed, such as tribological tests for extended times to estimate their possible degradation and the study of other key properties, such as thermal or electrical conductivity, and the compatibility and synergies with other additives used in the lubricant formulation.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | μ | σ | WSD/μm | σ/μm | WTD/μm | σ/μm | Area/μm2 | σ/μm2 |
---|---|---|---|---|---|---|---|---|
G-III base oil [31] | 0.1351 | 0.0014 | 366 | 18 | 2.11 | 0.19 | 607 | 44 |
+0.15 wt% SiO2 | 0.1319 | 0.0011 | 380 | 23 | 2.76 | 0.72 | 571 | 31 |
+0.30 wt% SiO2 | 0.1370 | 0.0010 | 422 | 53 | 3.37 | 0.67 | 806 | 76 |
+0.45 wt% SiO2 | 0.1410 | 0.0011 | 352 | 31 | 2.61 | 0.45 | 476 | 55 |
+0.60 wt% SiO2 | 0.1332 | 0.0012 | 372 | 8.3 | 2.67 | 0.46 | 726 | 49 |
+0.15 wt% SiO2-SA | 0.0989 | 0.0014 | 356 | 23 | 2.00 | 0.49 | 439 | 99 |
+0.30 wt% SiO2-SA | 0.0905 | 0.0011 | 371 | 18 | 1.60 | 0.19 | 401 | 62 |
+0.45 wt% SiO2-SA | 0.0927 | 0.0010 | 296 | 54 | 1.80 | 0.38 | 279 | 98 |
+0.60 wt% SiO2-SA | 0.0766 | 0.0011 | 289 | 25 | 1.64 | 0.47 | 281 | 84 |
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Liñeira del Río, J.M.; Guimarey, M.J.G.; Somoza, V.; Mariño, F.; Comuñas, M.J.P. Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles. Materials 2024, 17, 1993. https://0-doi-org.brum.beds.ac.uk/10.3390/ma17091993
Liñeira del Río JM, Guimarey MJG, Somoza V, Mariño F, Comuñas MJP. Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles. Materials. 2024; 17(9):1993. https://0-doi-org.brum.beds.ac.uk/10.3390/ma17091993
Chicago/Turabian StyleLiñeira del Río, José M., María J. G. Guimarey, Vanesa Somoza, Fátima Mariño, and María J. P. Comuñas. 2024. "Tribological Performance of a Paraffinic Base Oil Additive with Coated and Uncoated SiO2 Nanoparticles" Materials 17, no. 9: 1993. https://0-doi-org.brum.beds.ac.uk/10.3390/ma17091993