Abstract
There is a great need to perform all processes and services more efficiently to reduce energy consumption and material waste. Bearing systems are present in all machines and motors, playing an important role in the reduction of energy consumption. 100Cr6 (ISO 683-17:2014) and AISI 8620 are two typical steels employed in most bearing systems. However, improving the tribological performance of these steels is still required. This study reports the analysis of green lubricants based on mixtures of vegetable oils to improve the friction and wear properties of steel bearing systems. Firstly, a method is presented to identify potential mixtures based on the excess thermodynamic properties. Then, the tribological performance of the 100Cr6/8620 steel bearing system lubricated with the selected mixtures is evaluated by the ball-on-disk method. It was found that the friction and wear behavior of the 100Cr6/8620 steel bearing system can be notably improved by the utilization of oil mixtures rather than pure green oils. The kinetic friction coefficient decreased up to 10% with the ideal mixture of castor and sesame oil, while wear was reduced up to 81% with the ideal mixture of castor and canola oil. Therefore, we suggest that vegetable oil blends may be a good option for the feasible manufacture of biolubricants for bearing systems.
Highlights
Accepted: 17 February 2022Bearings are essential components that significantly influence the efficiency of engines and machines [1,2]
It is important to note that, in all cases, the density and viscosity of mixtures increased with the increase in castor oil concentration
The tribological performance of the ISO 100Cr6/AISI 8620 steel bearing system was analyzed under green oil lubrication
Summary
Bearings are essential components that significantly influence the efficiency of engines and machines [1,2] These mechanical elements help to reduce energy losses and increase the durability of machines, principally by minimizing friction and wear. To increase their efficiency, it is important to design accurate bearing systems, which involves the selection of potential materials, lubricants, and mechanical designs [2]. One of the most representative bearing steels is the high-carbon Cr-Mn alloy steel 100Cr6 (ISO 683-17:2014), equivalent to AISI 52100 [3]. ISO 100Cr steel is usually employed with Ni–Cr–Mo low-alloy steel
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