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Open AccessArticle

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, Universidade do Porto, Campus FEUP, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal
Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Instituto Superior de Engenharia do Politécnico do Porto, Rua Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal
Author to whom correspondence should be addressed.
Lubricants 2017, 5(3), 34;
Received: 30 June 2017 / Revised: 27 July 2017 / Accepted: 3 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Lubricating Greases 2017)
The relationship between the film generation and the coefficient of friction in grease lubricated contacts was investigated. Ball-on-disc tests were performed under different operating conditions: entrainment speed, lubricant temperature and surface roughness. The tests were performed with fully formulated greases and their base oils. The greases were formulated with different thickener types and also different base oils natures and viscosities. Film thickness measurements were performed in ball-on-glass disc tests, and Stribeck curves were measured in ball-on-steel disc tests with discs of different roughness. The role of the thickener and the base oil nature/viscosity on the film thickness and coefficient of friction was addressed and the greases’ performance was compared based on their formulation. View Full-Text
Keywords: film thickness; friction; roughness; greases film thickness; friction; roughness; greases
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MDPI and ACS Style

Gonçalves, D.; Vieira, A.; Carneiro, A.; Campos, A.V.; Seabra, J.H.O. Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts. Lubricants 2017, 5, 34.

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