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Investigates tribological properties of modified hBN in PEG lubricants, suggesting enhanced performance and stability.
The aim of this study is to investigate the effects of chemically modified hexagonal boron nitride (hBN) particles on the tribological properties of polyethylene glycol (PEG) based lubricant and sedimentation in PEG. Thermally purified and chemically modified hBN particles were compared with commercially available hBN particles of various sizes. Tribological tests were performed on a ball-on-disk optical tribometer under rolling–sliding conditions using a 100Cr6 steel ball and BK7 glass disk. The effects of hBN particle size and surface modification on the frictional behavior across boundary, mixed, and elastohydrodynamic (EHL) lubrication regimes were examined. The most pronounced reduction in the friction was achieved with the largest hBN particles (≈6.6 μm), which unfortunately tend to agglomerate in liquid PEG though. It was observed that agglomeration was strongly suppressed by chemical modification of hBN´s surface. The work also includes a post-experimental analysis which demonstrated good durability of hBN particles in PEG lubricant after tests.
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Pavliňák et al. (2026) studied this question.
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