Tribological Performance of Biodiesel Fuels
Summary
The tribological performance of biodiesel fuels encompasses the study of friction, wear and lubrication phenomena within mechanical contacts where biodiesel or biodiesel–diesel blends serve as lubricants. Biodiesel typically comprises fatty acid methyl esters (FAMEs) derived from vegetable oils or waste lipids. These polar molecules adsorb onto metal surfaces and form protective boundary films that reduce direct asperity contact, thereby lowering the coefficient of friction and mitigating wear. The nature and concentration of FAMEs, the presence of unsaturated bonds and feedstock origin all influence film formation, tribochemical transformations and the mechanical integrity of the tribofilm under varied temperature and load regimes. Experimental techniques such as high-frequency reciprocating rig (HFRR) tests, four-ball tribotesting and pin-on-disk configurations yield quantitative metrics—including wear scar diameter and specific wear rate—that inform blend optimisation. Recent advances highlight synergistic effects between biodiesel constituents and conventional lubricant additives, promoting the design of multicomponent systems with enhanced boundary-lubrication performance. These findings have global significance for the development of cleaner combustion engines, reduced maintenance intervals and extended equipment life, particularly in applications where ultralow-sulfur diesel exhibits poor inherent lubricity.
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Tribological Performance of Biodiesel Fuels publication trend
The graph below shows the total number of articles in tribological performance of biodiesel fuels across all publications each year (not limited to Nature Index journals).
Technical terms
Tribology: The science of friction, wear and lubrication between interacting surfaces in relative motion.
Coefficient of friction (COF): The ratio of frictional force resisting motion to the normal load between two surfaces.
Wear scar diameter (WSD): A metric of surface damage obtained from standard reciprocating or four-ball tribotests, indicating the severity of wear.
Fatty acid methyl esters (FAMEs): Polar organic esters produced by transesterification of fats or oils, constituting the principal components of biodiesel.
Boundary lubrication: A lubrication regime in which lubricant molecules adsorb to form a protective film, preventing direct asperity contact.
Tribofilm: A thin, often chemically altered layer generated at the sliding interface that contributes to reduced friction and wear.
References
- Tribochemistry of unsaturated fatty acids as friction modifiers in (bio)diesel fuel. RSC Advances (2017).
- Synergistic nano-tribological interaction between zinc dialkyldithiophosphate (ZDDP) and methyl oleate for biodiesel-fueled engines. Friction (2020).
- Lubricity Properties of Palm Oil Biodiesel Blends with Petroleum Diesel and Hydrogenated Vegetable Oil. Lubricants (2023).
- Tribological study on the biodiesel produced from waste cooking oil, waste cooking oil blend with Calophyllum inophyllum and its diesel blends on lubricant oil. Energy Reports (2022).
- A Review on the Impact of Bio‐Additives on Tribological Behavior of Diesel Fuels. Advances in Tribology (2024).
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