Experimental Wear Analysis of Nano-Sized Titania Particles as Additives in Automotive Lubricants
Abstract
:1. Introduction
2. Literature Review
3. Materials and Methods
4. Results
5. Discussion and Conclusions
- Based on the tribological results, the application of the titanium dioxide nanoparticles increases the friction by 20 to 32%. The consensus of the literature is that nano-sized titania particles have a friction-reducing effect, whereas the tests in this article report an increase in friction. While titania nanoparticles have been found to increase the viscosity of lubricating oil, titania was not able to prevent the massive friction-increasing effect of adhesion. In the future, it would be advisable to repeat the tests on the nanoparticles using some surface functionalization techniques on the nanoparticles.
- Titania nanoparticles could reduce the size of wear diameters by up to 32%. Titania protected the surface from forming deep grooves and reduced the wear volume parameters even up to 57%. These obtained results fully meet the expectations based on the literature.
- Titania increases the repeatability of the measurements, as the standard deviation of the measured values is significantly lower in every aspect. Publications have reported on the strengthening of the ability of nanoparticles to stabilize the tribological system.
- The optimum titania concentration in the used tribosystem can be defined at 0.4 wt%. The optimal concentration of the nano-additive in each tribological system used is different. The obtained result corresponds in magnitude with the optimum concentrations found in the literature.
- Scanning electron microscopy revealed that the primary wear type on the worn surface is abrasive wear. Abrasive wear is the main natural wear type characteristic of most tribological systems. Adhesive wear was found on the whole wear track, but it occurs more in the middle point of the wear track (highest relative speed area).
- Titanium intensity images revealed that all the worn area contains titania, but most of them can be found in the bottom of the deep wear grooves. EDX quantification defined the amount of titanium content on the worn surface as 0.56 to 0.62%. A result consistent with the literature is that the titania-rich tribofilm increases wear resistance.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameter on 100 °C | Group III | Group III + 0.4% TiO2 | Change [%] |
---|---|---|---|
Dynamic viscosity [mPa·s] | 3.432 | 3.663 | +6.73% |
Kinematic viscosity [mm2/s] | 4.373 | 4.653 | +6.39% |
Density [g/cm3] | 0.7848 | 0.7873 | +0.32% |
Element | Reference Surface | Center of the Wear Track | Dead Center of the Wear Track |
---|---|---|---|
Iron | 88.73 | 91.72 | 73.21 |
Chromium | 1.49 | 1.38 | 0.84 |
Silicon | 0.75 | 1.39 | 1.04 |
Oxygen | 2.33 | 3.7 | 2.25 |
Carbon | 6.70 | 1.19 | 22.1 |
Titanium | 0 | 0.62 | 0.56 |
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Szabó, Á.I.; Tóth, Á.D.; Abdallah, H.; Hargitai, H. Experimental Wear Analysis of Nano-Sized Titania Particles as Additives in Automotive Lubricants. Micro 2023, 3, 715-727. https://doi.org/10.3390/micro3030050
Szabó ÁI, Tóth ÁD, Abdallah H, Hargitai H. Experimental Wear Analysis of Nano-Sized Titania Particles as Additives in Automotive Lubricants. Micro. 2023; 3(3):715-727. https://doi.org/10.3390/micro3030050
Chicago/Turabian StyleSzabó, Ádám István, Álmos Dávid Tóth, Hebah Abdallah, and Hajnalka Hargitai. 2023. "Experimental Wear Analysis of Nano-Sized Titania Particles as Additives in Automotive Lubricants" Micro 3, no. 3: 715-727. https://doi.org/10.3390/micro3030050