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Green Tribology: A Review of Biodegradable Lubricants-Properties, Current Status, and Future Improvement Trends

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KOREAN SOC PRECISION ENG
DOI: 10.1007/s40684-023-00556

Keywords

Green tribology; Biodegradable lubricants; Environment; Friction; Wear

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The use of lubricants in mechanical systems to reduce friction and wear has a long history. However, concerns over the environmental impact of conventional mineral lubricants have led scientists to search for biodegradable alternatives. Despite their lower eco-toxicity, biodegradable lubricants have limitations such as high pour point and poor stability, hindering their full application in various industries. This review aims to introduce different sources and properties of biodegradable lubricants, discuss recent advances in tribology, and explore future trends for improving their tribological properties and overall performance.
The use of lubricants to lower friction and wear in mechanical systems has been established for centuries. Growing concerns about the hazardous effects of conventional mineral lubricants on the environment have motivated scientists to search for biodegradable substitutes. This threat is particularly at a critical level in ecologically sensitive regions. Despite their lower eco-toxicity, the inherent shortcomings of biodegradable lubricants (e.g., high pour point, and poor oxidative and thermal stability, etc.) have prevented their full application in different industries. This review intends to (1) introduce various sources of biodegradable lubricants, their properties, and applications; (2) discuss the current state and most recent advances from the tribology perspective; and (3) discuss future trends regarding improving the tribological properties and overall performance of biodegradable lubricants.

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