Operation of low-speed gallium-lubricated tungsten slipring assembly in vacuum for 500 hours
John S. Przybyszewski, United States. National Aeronautics and Space Administration, Lewis Research Center
National Aeronautics and Space Administration, 1971 - Technology & Engineering - 19 pages
Performance of gallium lubricated slipring assembly in ultrahigh vacuum for 500 hours.
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009 milliohm peak 132 millimeters 20 amperes dc 500-hour experiment 872x10 cubic millimeter ASSEMBLY IN VACUUM coefficient of friction contact area contact current contact electrical noise contact noise contact resistance trace contact voltage drop continuous gallium film current of 20 disk specimen Disk Wear disk with gallium drop of gallium duration of experiment electrical discharge machined electrical resistivity Faint trace Faint Friction Force Measurement GALLIUM-LUBRICATED TUNGSTEN SLIPRING grams grinding marks hemisphere and disk hemisphere polarity hemisphere positive hours elapsed running hours of operation Lewis Research Center liquid gallium load lubricant millimeter of sliding millimeter per millimeter millimeters per minute minute 1 rpm Oscilloscope peak to peak period running against tungsten shown in figure slipring material slipring noise surface grooves Surface profilimeter traces thermocouple torr trace Faint trace tungsten disk tungsten hemisphere running tungsten slipring assembly ultrahigh vacuum vacuum system values of contact wear rate wear track area wear track zone