Accession Number : ADA306882

Title :   Friction and Wear of Nine Selected Polymers with Various Fillers in Liquid Hydrogen.

Descriptive Note : Technical note,

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

Personal Author(s) : Wisander, Donald W. ; Johnson, Robert L.

PDF Url : ADA306882

Report Date : MAR 1969

Pagination or Media Count : 22

Abstract : Experiments were conducted with a 0.1875-inch- (0.476-cm-) radius hemisphere of nine polymers in sliding contact with a rotating 17-4 PH disk in liquid hydrogen. Sliding velocity was 2300 feet per minute (701 m/min) at a load of 1 kilogram. Results indicate that several filled polymers show promise. Graphite-filled polyamide (nylon), graphite filled and glass-fiber-filled polytrifluorochlorethylene (PTFCE) and a 50-percent poly-tetrafluoroethylene (PTFE) - 50-percent polyparaphenyl have friction and wear similar to filled-PTFE composites commonly used in cryogenic applications.

Descriptors :   *POLYMERS, *WEAR, *PLASTICS, *SLIDING FRICTION, NYLON, POLYAMIDE PLASTICS, GRAPHITE, GLASS FIBERS, LIQUID HYDROGEN, CRYOGENICS, POLYCARBONATES, MOLYBDENUM COMPOUNDS, FILLERS, SELF LUBRICATION.

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE