Accession Number : ADA307837

Title :   Film-Transfer Studies of Seven Ball-Bearing Retainer Materials in 60 deg. R (33 deg. K) Hydrogen Gas at 0.8 Million DN Value.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Brewe, David E. ; Scibbe, Herbert W. ; Anderson, William J.

PDF Url : ADA307837

Report Date : NOV 1966

Pagination or Media Count : 28

Abstract : Seven self-lubricating retainer materials (a laminated glass cloth with polytetrafluoroethylene (PTFE) binder, a glass-fiber - molybdenum disulfide-filled PTFE, a glass-fiber-filled PTFE, a bronze-filled PTFE, a copper - PTFE - tungsten diselenide composite, a silver - PTFE - tungsten diselenide composite, and a molybdenum disulfide-filled polyimide) were evaluated in 40-millimeter-bore ball bearings operating in hydrogen gas at 60 deg R (33 deg K). The bearings were operated at 20 000 rpm with a 200-pound (890 N) thrust load for total times to 10 hours. Individual bearing runs were of approximately 2-hour durations. The formation and subsequent life histories of the transfer films were studied and evaluated from highly magnified profile traces of the bearing inner-race grooves. The wear and mechanical integrity of the retainer materials were determined by visual observations and weight-differential measurements after each 2-hour run

Descriptors :   *FILMS, *HYDROGEN, *GASES, *TRANSFER, *BALL BEARINGS, MECHANICAL PROPERTIES, MOLYBDENUM, COPPER, BINDERS, THRUST, LUBRICATION, SILVER, SELENIDES, FLUORINE COMPOUNDS, ETHYLENES, LAMINATED GLASS, TUNGSTEN COMPOUNDS, GLASS TEXTILES.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Lubricants and Hydraulic Fluids
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE