Tribological performance of green nanolubricants using functionalized CaCO3 nanoparticles

• Published in: Tribology international 2024-11, Vol.199, p.110007, Article 110007
• Main Authors: Liñeira del Río, José M., Fernandes, Carlos M.C.G., Gonçalves, David E.P., Seabra, Jorge H.O.
• Format: Article
• Language: English
• Subjects: Biolubricants; Functionalization; Nanoparticles; Surface analysis
• ISSN: 0301-679X
• DOI: 10.1016/j.triboint.2024.110007

In response to the mounting concern over environmental pollution and the depletion of petroleum reserves, biolubricants have emerged as a promising alternative to mineral oil-based lubricants. Thus, the aim of this research is the tribological characterization of green castor and soybean nanolubricants containing functionalized CaCO3 nanoparticles. Friction improvements were reached with maximum friction decreases of 14 % and 18 % compared to castor and soybean oils. Concerning wear, optimal concentration for castor and soybean nanolubricants was intermediate concentration of 0.15 wt% with width wear reductions of 27 % and 24 % compared to castor and soybean oils, respectively. Tribological mechanisms of tribofilm formation, repairing and rolling-bearing were identified. In rolling-sliding tests, the use of nanoparticles was crucial at low speeds with outstanding friction reductions. [Display omitted] •f-CaCO3 nanolubricants showed a good temporal stability.•0.15 wt% f-CaCO3 was the optimal friction and wear performance for both oils.•0.15 wt% f-CaCO3 in castor oil: 14 % friction and 27 % wear reductions.•0.15 wt% f-CaCO3 in soybean oil: 18 % friction and 24 % wear reductions.•Lubrication mechanism by rolling effect, adsorbed tribofilm and repairing.