On the evolution of oil-separation properties of lubricating greases under shear degradation

Femke Hogenberk*, Jude A. Osara, Dirk van den Ende, Piet M. Lugt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
139 Downloads (Pure)

Abstract

The bleed rate of a grease may change over time due to degradation of the thickener microstructure and a decrease in oil content, as oil is released from the grease. In this work, the bleed properties—quantified by the permeability—of five types of lubricating greases are studied. Controlled shear ageing is performed using a grease worker. It is shown that the bleed rate does not change significantly in a grease worker at room temperature, as opposed to changes in rheology and microstructure. This is explained using a permeability model. It is shown, via a comparison with rolling bearings results, that ageing grease in a grease worker is too mild to yield significant changes in the permeability of lubricating greases.
Original languageEnglish
Article number108154
Number of pages7
JournalTribology international
Volume179
Early online date5 Dec 2022
DOIs
Publication statusPublished - Jan 2023

Keywords

  • UT-Hybrid-D

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