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A Spectroscopic DRIFT-FTIR Study on the Friction-Reducing Properties and Bonding of Railway Leaf Layers.

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Název: A Spectroscopic DRIFT-FTIR Study on the Friction-Reducing Properties and Bonding of Railway Leaf Layers.
Autoři: White, Ben, Lanigan, Joseph, Lewis, Roger
Zdroj: Lubricants (2075-4442); Aug2025, Vol. 13 Issue 8, p329, 15p
Témata: FRICTION, BOND formation mechanism, FRICTION measurements, PLANT residues, INTERFACIAL bonding, TRACTION (Engineering), SPECTROMETRY, BOUNDARY lubrication
Abstrakt: Leaves react with rail steel and form a tribofilm, causing very low friction in the wheel/rail interface. This work uses twin-disc tribological testing with the addition of leaf particulates to simulate the reaction and resulting reduction in the friction coefficient in a laboratory setting. Diffuse Reflectance Fourier-Transform Infrared Spectroscopy was carried out on the organic material and the layers that formed on the twin-disc surface. Dark material, visibly similar to leaf layers formed on tracks during autumn, was used along with a transparent thin film. This "non-visible contamination" has been reported to cause low-adhesion problems on railways, but has not previously been characterised. This article discusses the nature of these layers and builds upon earlier studies to propose a degradation and bonding mechanism for the leaf material. This understanding could be used to improve friction management methods employed to deal with low adhesion due to leaves. [ABSTRACT FROM AUTHOR]
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Abstrakt:Leaves react with rail steel and form a tribofilm, causing very low friction in the wheel/rail interface. This work uses twin-disc tribological testing with the addition of leaf particulates to simulate the reaction and resulting reduction in the friction coefficient in a laboratory setting. Diffuse Reflectance Fourier-Transform Infrared Spectroscopy was carried out on the organic material and the layers that formed on the twin-disc surface. Dark material, visibly similar to leaf layers formed on tracks during autumn, was used along with a transparent thin film. This "non-visible contamination" has been reported to cause low-adhesion problems on railways, but has not previously been characterised. This article discusses the nature of these layers and builds upon earlier studies to propose a degradation and bonding mechanism for the leaf material. This understanding could be used to improve friction management methods employed to deal with low adhesion due to leaves. [ABSTRACT FROM AUTHOR]
ISSN:20754442
DOI:10.3390/lubricants13080329