Abstract
Fluids and lubricants are critical for the mechanical manufacturing processing of metals, due to a high amount of friction generated, also reflected as heat, could wear and damage tooling and machine components. The proper application of lubricants increases machinery lifetime, decreases long-term costs, and energy and time consumption due to the maintenance or components exchange/repairs. Besides being non-renewable, mineral oils bring consequences to the environment due to their low biodegradability and could affect the user with respiratory and skin diseases. Recently, due to an increase in environmental awareness, the search of biocompatible and efficient lubricants has become a technology goal. The vegetable oil-based lubricants are slowly emerging as ecofriendly and high-performance alternatives to petroleum-based lubricants. This study evaluates soybean, sunflower, corn and paraffinic oils reinforced with SiO2 nanoparticles. The thermal and tribological evaluations were performed varying the temperature and nanofiller concentrations. The thermal conductivity improvements were observed for all nanolubricants as the temperature and filler fraction increased. The highest thermal conductivities were observed at 323 K with 0.25 wt % SiO2. The soybean and corn oils unveiled a maximum enhancement of ~11%. The tribological evaluations showed that SiO2 addition, even in small concentration, resulted into a significant improvement on a load-carrying capacity. For instance, at 0.25 wt % enhancements of 45% and 60% were observed for soybean and sunflower oils, respectively. The coefficient of friction performance also showed enhancements between 10% and 26%.
Highlights
In the manufacturing industry, it is well-known that metal-working fluids improve the efficiency of machining in terms of increased tool life, improved tolerance and surface finish and reduced cutting force or vibrations [1]
The thermal conductivity of the studied nanofluids was found to be gradually increased with the SiO2 filler concentration increase
For all the nanofluids, the thermal conductivity was observed to improve as temperature elevated, indicating the
Summary
It is well-known that metal-working fluids improve the efficiency of machining in terms of increased tool life, improved tolerance and surface finish and reduced cutting force or vibrations [1]. The process itself generates a high amount of friction, which could wear and damage the machines tooling and/or components that are manufactured. This friction must be solved with the aid of lubricants, coatings or the combination of both. The most common tool to counterattack friction and heat generated by a system, are lubricants. They generate a very thin film between two surfaces, which helps to increase the useful life of the machinery and reduce the damage of the component in its manufacture [1].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
