On the friction behaviour of polymer greases

Gonçalves, David; Graça, Beatriz; Campos, Armando José Vilaça; Seabra, J.

http://hdl.handle.net/10400.22/10249

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Authors

Gonçalves, David

Graça, Beatriz

Campos, Armando José Vilaça

Seabra, J.

Abstract(s)

Non-additized batches of lubricating greases were tribologically characterized through traction coefﬁ-cient and Stribeck curves at different operating conditions on a ball-on-disc test rig, ensuring that the contact was fully ﬂooded. The tests were performed at constant load, but different operating tempera-tures while varying the slide-to roll ratio (SRR) or the rolling entrainment speed. The results were correlated to the greases' formulation in terms of base oil viscosity, thickener and/or elastomer content. A relationship between the coefﬁcient of friction (COF) of greases formulated with different thickener content was found and the thickener inﬂuence on the COF was addressed.