NDLI: Enhancement of perfluoropolyether boundary lubrication performance: i. preliminary results

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Enhancement of perfluoropolyether boundary lubrication performance: i. preliminary results

Content Provider	NASA Technical Reports Server (NTRS)
Author	Jones Jr., W. R. Ajayi, O. O. Goodell, A. J. Wedeven, L. D. Devine, E. Premore, R. E.
Copyright Year	1995
Description	A ball bearing simulator operating under starved conditions was used to evaluate the boundary lubrication performance of a perfluoropolyether (PFPE) Krytox 143 AB. Several approaches to enhance boundary lubrication were studied. These included: (1) soluble boundary additives, (2) bearing surface modifications, (3) 'run-in' surface films, and (4) ceramic bearing components. In addition, results were compared with two non-perfluorinated liquid lubricant formulations. Based on these preliminary tests, the following tentative conclusions can be made: (1) substantial improvements in boundary lubrication performance were observed with a beta-diketone boundary additive and a tricresyl phosphate (TCP) liquid surface pretreatment; (2) the use of rough Si3N4 balls (Ra = 40 micro-in) also provided substantial improvement but with concomitant abrasive wear; (3) marginal improvements were seen with two boundary additives (a phosphine and a phosphatriazine) and a neat (100%) fluid (a carboxylic acid terminated PFPE); and surface pretreatments with a synthetic hydrocarbon, a PTFE coating, and TiC coated 440C and smooth Si3N4 balls (R(sub a) less than 1 micro-in); and (4) two non-PFPE lubricant formulations (a PAO and a synthetic hydrocarbon) yielded substantial improvements.
File Size	708672
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950024200
Archival Resource Key	ark:/13960/t5q867n23
Language	English
Publisher Date	1995-06-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Phosphates Abrasion Polytetrafluoroethylene Additives Ball Bearings Lubricants Hydrocarbons Spacecraft Lubrication Ceramics Coatings Perfluoro Compounds Silicon Nitrides Boundary Lubrication Pretreatment Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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