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Tribology Letters

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01.02.2023 | Original Paper

Dependency of Lithium Complex Grease on the Size of hBN Particles for Enhanced Performance

verfasst von: Nikhil Kumar, Vinay Saini, Jayashree Bijwe

Erschienen in: Tribology Letters | Ausgabe 1/2023

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Abstract

Industries continue to seek novel eco-friendly additives for developing greases for enhanced tribo-performance and multi-functionality. A lot is reported on the potential of nanoparticles in this aspect, but very limited on the “size effect” of particles, especially on an exploration of hexagonal boron nitride (hBN) particles. In this work, three sizes (micron, sub-micron, and nano) of hBN particles (each ten times bigger than the earlier ones) were used (4 wt.%) in grease to determine the size effect of hBN particles on performance properties, including tribological. Developed greases were examined for tribological properties using a four-ball friction tester, SRV tester, and four-ball EP tester. The results indicated that the greases containing nanoparticles (NPs) of hBN exhibited the best anti-friction (AF), anti-wear (AW), and extreme pressure (EP) properties. These proved more effective as AFA and AWA (~ 60% improvement) rather than EPA (~ 25% improvement) compared to the Li-grease. The morphology and chemical compositions of the films formed on the worn steel balls’ surfaces were examined using the scanning electron microscope, EDAX, Raman spectrometer, and 3 D profilometry. Results indicated that easy penetration of smaller-sized hBN particles into the clearance space of a tribo-couple facilitated the formation of beneficial coherent tribo-film that protected the tribo-surfaces, as evident from SEM-EDAX, and Raman data.

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Vorheriger Artikel Influence of Surface Roughness on Press Fits

Nächster Artikel Nano and Sub-nano Scale Friction Behavior in Rotary Processing of 6H-SiC with Different Off-Axis Angles

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Titel: Dependency of Lithium Complex Grease on the Size of hBN Particles for Enhanced Performance
verfasst von: Nikhil Kumar
Vinay Saini
Jayashree Bijwe
Publikationsdatum: 01.02.2023
Verlag: Springer US
Erschienen in: Tribology Letters / Ausgabe 1/2023
Print ISSN: 1023-8883
Elektronische ISSN: 1573-2711
DOI: https://doi.org/10.1007/s11249-022-01691-3

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