A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms. For lubricated tests a mixture of n-hexadecane (cetane) as base fluid and palmitic acid as lubricity additive was used. Experimental results, including results obtained by running unlubricated (dry) tests and results obtained from literature were all considered to formulate the hypothesis that a fully functional additive film will not survive the full duration of the lubricity test, which is 75 minutes [5]. Friction values obtained in the experiments conducted were much higher than what is expected for boundary films formed by long chain carboxylic acids. Comparable friction values were obtained in the first few seconds of the tests, but the friction values increased indicating the destruction of the boundary film. Metal oxide lubrication dominates for the remainder of the test.
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ASME/STLE 2011 International Joint Tribology Conference
October 24–26, 2011
Los Angeles, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-5474-7
PROCEEDINGS PAPER
Mechanisms of Lubricated and Unlubricated Friction and Wear Available to Purchase
G. Marais,
G. Marais
University of Pretoria, Pretoria, South Africa
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P. L. de Vaal
P. L. de Vaal
University of Pretoria, Pretoria, South Africa
Search for other works by this author on:
G. Marais
University of Pretoria, Pretoria, South Africa
P. L. de Vaal
University of Pretoria, Pretoria, South Africa
Paper No:
IJTC2011-61188, pp. 103-107; 5 pages
Published Online:
February 9, 2012
Citation
Marais, G, & de Vaal, PL. "Mechanisms of Lubricated and Unlubricated Friction and Wear." Proceedings of the ASME/STLE 2011 International Joint Tribology Conference. ASME/STLE 2011 Joint Tribology Conference. Los Angeles, California, USA. October 24–26, 2011. pp. 103-107. ASME. https://doi.org/10.1115/IJTC2011-61188
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