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A commentary on solid lubricants and wear resistant solids for use in extreme environmentsThe need for high temperature tribological coatings and self-lubricating materials in advanced technology is discussed. A qualitative model for the mechanism of solid lubrication is proposed. The model is based upon microscopic observations of the dynamics of third-body solids in lubricated contacts. In this model, the rheology of plastic flow is suggested as a more general criterion for predicting the lubricating potential of a solid material than, for example, a specific crystal structure. Some examples of layer-lattice and nonlayer-lattice solids that lubricate by virtue of their extreme plasticity, film coherence, and adhesion to the lubricated metal are described. Circumstantial evidence for the model is presented for low shear-strength solids at room temperature and for solids such as calcium fluoride that become lubricative only when their brittle-to-ductile transition temperature is exceeded. Some materials considerations in the selection of hard-coat materials for wear control are also presented.
Document ID
19830007197
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sliney, H. E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1982
Subject Category
Nonmetallic Materials
Report/Patent Number
E-1486
NASA-TM-83042
NAS 1.15:83042
Meeting Information
Meeting: Joint Lubrication Conf.
Location: Washington, DC
Country: United States
Start Date: October 4, 1982
End Date: October 6, 1982
Sponsors: ASME, Am. Soc. of Lubrication Engr.
Accession Number
83N15468
Funding Number(s)
PROJECT: RTOP 505-33-113
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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