Although the chemical composition of vegetable oils is responsible for their enhanced lubricity at ambient conditions, it is also the main reason for their degradation at elevated temperatures. Therefore, this study focuses on the friction and wear of soybean and sunflower oils at elevated temperatures in comparison to a base mineral oil. It was found that the wear and friction are less severe for the vegetable-based lubricants up to temperatures around 100°C. The observed performance of the vegetable-based lubricants is verified using a kinetic reaction mechanism model of the lubricant degradation.

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