Abstract
The depletion of the world’s crude oil reserve, increased oil prices, and the demand to protect the environment against pollution exerted by hydraulic and gear oils have brought about renewed interest in the development and use of green lubricants. In this light, many automotive and manufacturing industries are actively seeking out new green lubricants. Although, many green lubricants have exhibited excellent properties, more improvement in their friction and wear performance are still needed for them to become mainstream. Consequently, environmental friendly additive materials are being included in green lubricant formulations to improve their friction and wear properties. In this study, a review of the tribological behavior of the green lubricants presently available has been performed. Overall, the review indicates that green lubricants can significantly outperform conventional lubricants with respect to frictional and wear performance. In addition, the review shows that the size and composition of the lubricant additives play an important role in determining a green lubricant’s overall performance.
Published Version
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