Abstract
The applications of biogenic lubricating greases to machine elements play important roles in the reduction of friction energy and minimizing wear in a tribological contact, as well as the prevention of environmental pollution. The aim of this work was to investigate completely biogenic lubricating greases from a tribological point of view. Model greases were examined using a ball on a disc tribometer at a constant normal force to investigate the friction and wear process according to Fleischer’s energetic wear model. Using the energy-based wear model, the friction and wear process could be interpreted as a cause–effect sequence. Moreover, the influence of the model grease composition on the friction and wear process was analyzed. In addition, rolling bearing tests were performed to investigate the tribological behaviors of some selected biogenic greases during real machine element contact. These tests allowed for the quantification of the friction torque behavior of the full bearing and the evaluation of the wear obtained through lubricant analysis procedures. This experimental work provides useful information regarding the influence that the composition of biogenic model greases has on friction and wear behaviors in a tribological contact.
Highlights
The use of biodegradable greases for different industrial applications is remarkably important for avoiding direct and indirect environmental pollution [1,2,3]
A linear relationship was observed between the friction coefficient and the wear data for most of the examined model grease samples
This result revealed that the lower the friction coefficient was, the lower the wear volume that occurred on the steel plate due to the friction process
Summary
The use of biodegradable greases for different industrial applications is remarkably important for avoiding direct and indirect environmental pollution [1,2,3]. As discussed and reported in previous works [4,5,6,7], the use of vegetable oil instead of mineral oil as a liquid lubricant shows some advantages, such as good lubricity, the ability to adhere to metal surfaces, non-toxicity, and low volatility, as well as some disadvantages, such as poor oxidative stability and low temperature flow properties These negative features can be overcome or minimized by using additives or inducing chemical modifications [5,6,8,9,10,11].
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