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

doi:10.1016/j.triboint.2022.108154

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 journal › Article › Academic › peer-review

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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 language	English
Article number	108154
Number of pages	7
Journal	Tribology international
Volume	179
Early online date	5 Dec 2022
DOIs	https://doi.org/10.1016/j.triboint.2022.108154
Publication status	Published - Jan 2023

Keywords

UT-Hybrid-D

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10.1016/j.triboint.2022.108154Licence: CC BY

ArticleFinal published version, 1.62 MBLicence: CC BY

Cite this

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title = "On the evolution of oil-separation properties of lubricating greases under shear degradation",

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.",

keywords = "UT-Hybrid-D",

author = "Femke Hogenberk and Osara, \{Jude A.\} and Ende, \{Dirk van den\} and Lugt, \{Piet M.\}",

note = "Funding Information: This research was carried out under project number T19021 in the framework of the Research Program of the Materials innovation institute (M2i) ( www.m2i.nl ) supported by the Dutch government . We would like to thank SKF Research \& Technology Development for the permission to publish this paper. This research was performed at the SKF University Technology Centre (UTC) for Grease Lubrication at the University of Twente and was funded by SKF and M2i. Funding Information: This research was carried out under project number T19021 in the framework of the Research Program of the Materials innovation institute (M2i) (www.m2i.nl) supported by the Dutch government. We would like to thank SKF Research \& Technology Development for the permission to publish this paper. This research was performed at the SKF University Technology Centre (UTC) for Grease Lubrication at the University of Twente and was funded by SKF and M2i. Publisher Copyright: {\textcopyright} 2022 The Authors",

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N1 - Funding Information: This research was carried out under project number T19021 in the framework of the Research Program of the Materials innovation institute (M2i) ( www.m2i.nl ) supported by the Dutch government . We would like to thank SKF Research & Technology Development for the permission to publish this paper. This research was performed at the SKF University Technology Centre (UTC) for Grease Lubrication at the University of Twente and was funded by SKF and M2i. Funding Information: This research was carried out under project number T19021 in the framework of the Research Program of the Materials innovation institute (M2i) (www.m2i.nl) supported by the Dutch government. We would like to thank SKF Research & Technology Development for the permission to publish this paper. This research was performed at the SKF University Technology Centre (UTC) for Grease Lubrication at the University of Twente and was funded by SKF and M2i. Publisher Copyright: © 2022 The Authors

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AB - 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.

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

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Keywords

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