On the film thickness behaviour of polymer greases at low and high speeds

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Goncalves, D (Author) Other; Graca, B (Author) Other; Campos, AV (Author) Other; Jorge Seabra (Author) FEUP; Leckner, J (Author) Other; Westbroek, R (Author) Other

Journal

Title: Tribology International

Vol. 90

Pages: 435-444

ISSN: 0301-679X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 33 Citations

Other information

Authenticus ID: P-00G-B0M

DOI: 10.1016/j.triboint.2015.05.007

Abstract (EN): Experimental batches of polymer thickened greases, as well as their base and bleed-oils were tribologically characterized through film thickness measurements over a wide range of entrainment speeds on a ball-on-disc test rig using optical interferometry. The results are in agreement with previous observations of several authors. Under fully flooded conditions and low speed it was observed that thickener lumps enter the contact producing a high film thickness plateau. The transition speed at which the film thickness increases with decreasing speed is dependent on the thickener content and operating temperature. At moderate to high speeds, all the tested greases show a film thickness much higher than the base and bleed-oils, even though the bleed-oil's filth thickness is closer to the grease's.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10