Lubrication efficiency of vegetable oil nano-lubricants and solid powder lubricants

Abstract

Reducing crude oil reserves and also environmental pollution caused by its excessive use has led to numerous researches to find alternatives to petroleum-based oils. Thus, owing to lower pollution and higher lubrication efficiency, the use of vegetable base lubricants has been widely considered. Due to the unique properties of different nanoparticles such as sphericality and high surface area besides low environmental risk, the subjected nanoparticles can be applied as additives to the base lubricants and create optimal tribological properties. In this study, in order to improve the lubricating efficiency of vegetable base lubricants, SiO2 nanoparticles with different weight concentrations were used in the cold forging process of aluminum alloy. Then, the lubrication proficiency of both nano-lubricants and conventional solid powder lubricants in the forging industry was evaluated. Friction coefficient was determined by standard compression test and friction calibration curves. In order to evaluate the lubricants’ efficiency, two key parameters, namely shear friction coefficient and surface roughness have been considered. Experimental results showed that the presence of SiO2 nanoparticles in the base lubricants significantly increased the lubrication efficiency of the base lubricants and notably reduced both the friction coefficient and surface roughness.

The size effect of molybdenum disulphide additives on friction and wear performance of lithium-thickened palm olein grease

“…The main reason for this condition is that due to the small size of MoS 2 nanoparticles, the inflow of the particles occurs easily between the two contacting surfaces, causing the roughness to be filled and thus preventing the surfaces from more profound and wider wear. 8 It can also be attributed to the mending effect mechanisms where the nanoparticles filled the wear region and improved the surface roughness. 18 On the other hand, because of its larger size, micro MoS 2 particles might have scratches on the frictional surfaces as it has a flake-like shape with relatively sharp edges, which was not able to significantly reduce the roughness compared to the palm grease without additive.…”

“…Plant oils such as sunflower oil, 5 palm kernel oil, 6 palm trimethylolpropane ester (TMP), 7 peanut oil 8 and rapeseed oil 9 are among those that have been evaluated for their lubrication abilities. A wide range of applications of plant-based lubricants requires a sustainable resource.…”

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

“…Proper lubrication methods can dramatically improve bearing fatigue life and performance indicators such as friction, wear, temperature, and vibration [123,124]. To make bearings maintain an excellent lubricating effect for a long time when designing the lubrication method, consider the use of the correct lubricant, calculate the amount of lubricant, determine the appropriate oil change cycle, and other factors [125,126]. Currently, there are four main categories of bearing lubrication based on the type of lubricant used: oil lubrication, grease lubrication, solid lubrication, and gas lubrication [123,127].…”

Performance evaluation of vegetable base oils relative to mineral base oils in the lubrication of cold forming processes of 2024 aluminum alloy

“…Main factors that indicated the tribological performance of oils are friction coefficient, pressing forces, and surface roughness. 11,12 Materials and experimental procedure Materials…”