NDLI: Magnetic fluid friction and wear behavior

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Magnetic fluid friction and wear behavior

Content Provider	NASA Technical Reports Server (NTRS)
Author	Keith Jr., Theo G.
Copyright Year	1998
Description	The friction and wear properties of two groups of magnetic fluids, one developed at NASA Lewis Research Center and a commercial fluid, were evaluated for boundary lubrication. Friction and wear measurements were made using a pin-on-disk apparatus. Three different ball materials were evaluated, (1) 440C, (2) Al2O3, and (3) Si3N4 against 440C disks. The first class of magnetic fluids have a low vapor pressure hydrocarbon base oil and are suitable for space application. Four variations of this fluid were evaluated: (1) the base oil, (2) base oil with anti-wear additives, (3) a 100 Gauss strength magnetic fluid, and (4) a 400 gauss magnetic fluid. The commercial fluid base oil and four different magnetic particle concentration levels have been evaluated. A space qualified fluorinated lubricant was tested for base line comparison. Hardness, optical microscopy, surface profilometry, and surface analysis were used to characterize the test specimens. Friction was unaffected by the concentration of magnetic particles. Wear rates for magnetic fluids were slightly higher than the base oil. The low vapor pressure magnetic fluid has better wear characteristics than the space qualified fluorinated lubricant.
File Size	315225
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19990009051
Archival Resource Key	ark:/13960/t7pp41p2p
Language	English
Publisher Date	1998-12-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Additives Oils Lubricants Vapor Pressure Hydrocarbons Friction Measurement Hardness Friction Microscopy Abrasion Resistance Ferrofluids Wear Low Pressure Silicon Nitrides Wear Inhibitors Boundary Lubrication Pins Aluminum Oxides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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