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Dynamics of solid dispersions in oil during the lubrication of point contacts. I - GraphiteA Hertzian contact is lubricated with dispersed graphite in mineral oils under boundary lubrication conditions. The contacts are optically observed under pure rolling, combined rolling and sliding, and pure sliding conditions. The contact is formed with a steel ball on the flat surface of a glass disk. Under pure rolling and combined rolling and sliding conditions, it is found that, for low speeds, a graphite film can form which will separate the contacting surfaces. In contrast, under pure sliding conditions, graphite accumulates at the inlet and sweeps around the contact, but very little of graphite passes through the contact. The accumulated graphite appears to act as a barrier which reduces the supply of oil available to the contact for boundary lubrication. Friction data show no clear short-term beneficial or detrimental effect caused by addition of graphite to the base oil. However, during pure sliding, more abrasion occurs on the polished balls lubricated with the dispersion than on those lubricated with the base oil alone.
Document ID
19810049456
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cusano, C.
(Illinois, University Urbana, Ill., United States)
Sliney, H. E.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1981
Subject Category
Nonmetallic Materials
Report/Patent Number
ASLE PREPRINT 81-AM-5D-3
Meeting Information
Meeting: Annual Meeting
Location: Pittsburgh, PA
Start Date: May 11, 1981
End Date: May 14, 1981
Sponsors: American Society of Lubrication Engineers
Accession Number
81A33860
Distribution Limits
Public
Copyright
Other

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