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Rheological properties of lithium, lithium complex, and sodium greases
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-4785-7098
1993 (English)In: Journal of Synthetic Lubrication, ISSN 0265-6582, Vol. 10, no 3, p. 225-236Article in journal (Refereed) Published
Abstract [en]

The rheological properties of two lithium, two lithium complex, and two sodium greases, all with the most common NLGI grade two, have been investigated. The greases are based on a mineral and a synthetic oil. The apparatus used was a cone-and-plate rheometer and an impacting-ball apparatus. The impacting-ball apparatus used a steel ball, which impacted a lubricated sintered carbide plate, to measure the shear stress-pressure coefficient, γ, of the lubricant. At pressures found in elastohydrodynamic contacts this coefficient determined the limiting shear stress. The γ-value thus affects the coefficient of friction and consequently, lower γ-value means less friction. The results from the impacting-ball apparatus showed that γ-value was lower for the greases with a synthetic base oil and that the lithium greases gave a lower γ-value than the corresponding base oils. Results from the cone-and-plate rheometer showed the characteristic shear thinning behaviour of the greases and the influence of shear history and temperature. The results from the cond-and-plate rheometer have also been fitted to a four parameter rheological model.

Place, publisher, year, edition, pages
1993. Vol. 10, no 3, p. 225-236
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-8461Local ID: 6f9367c0-c25d-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-8461DiVA, id: diva2:981399
Note
Godkänd; 1993; 20061109 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-09Bibliographically approved

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Höglund, Erik

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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