Abstract:
A plain bearing material comprising, in percent by volume, from about 40% to about 95% of a fluorocarbon resin, such as polytetrafluoroethylene; from about 5% to about 60% of cadmium or an oxide of cadmium; and from about 0.1% to about 35% of a filler characterized by a hardness greater than the hardness of cadmium oxide, such as bronze, for example. Plain bearings produced from such material exhibit a wear resistance of over five hundred times that of a bearing formed of a fluorocarbon resin filled with either cadmium oxide or bronze alone, and of more than double the wear resistance of bearings formed of the best leadbronze-fluorocarbon resin systems of the prior art.
Abstract:
GREASE COMPOSITIONS COMPRISING PERFLUOROALKYPOLYETHER (PFAPE) FLUIDS THICKENED WITH POLYTETRAFLUOROETHYLENE ( PTFE) FOR USE WITH LIQUID FUELED ROCKET ENGINES THE GREASE INCLUDING A SMALL QUANTITY OF RUST PREVENTING SODIUM NITRITE. THE GREASES EXHIBIT A VERY UNEXPECTED AND SIGNIFICANT IMPROVEMENT IN EXTREME PRESSURE CHARACTERISTICS, ARE RUST PREVENTIVE, AND ARE NONREACTIVE UPON CONTACT WITH CONVENTIONAL FUELS AND OXIDIZERS, AND AT HIGH IMPACT ENERGIES IN THE PRESENCE OF LIQUID OXYGEN AND OTHER OXIDIZERS USED IN CONVENTIONAL ROCKET ENGINES.
Abstract:
A thermoplastic molding composition comprising (1) a polyamide, (2) polytetrafluoroethylene and (3) an inert filler selected from the group consisting of silica and magnesium oxide is provided. The composition can be pressed and sintered, injection molded, compression molded, extruded or readily applied to a substrate by spraying, dipping or painting. It is self-lubricating and highly resistant to creep and wear, and is especially adapted for use as self-lubricating bearing surfaces or elements such as machine tool bed ways, gears, rollers, cams and the like.
Abstract:
A NOVEL COATING COMPOSITION FOR DRY FILM LUBRICANT WHICH COMPRISES A SYNTHETC RESIN FRO PAINT CONTAINING DISPERSED THEREIN A MIXTURE OF AT LEAST ONE CONVENTIONAL LUBRICATING MATERIAL HAVING A PARTICLE SIZE OF UP TO 60 MICRONS, SUCH AS MOLYBDENUM DISULFIDE POWDER, GRAPHITE POWDER OR POLYTETRAFLUOROETHYLENE POWDER, AND A FINE FLUORINATED GRAPHITE POWDER HAVING A PARTCLE SIZE OF UP TO 60 MICRONS, THE PROPORTION OF SAID SYNTHETIC RESIN TO SAID MIXTURE BEING 90:10 TO 10:90, PEFERABLY 60:40 TO 40:60, BY WEIGHT AND THE PROPORTON OF THE CONVENTIONAL LUBRICATING MATERIAL TO THE FLUORINATED GRAPHITE POWDER BEING 99.5:0.5 TO 5:95, PREFERABLY 70:30 TO 30:70, BY WEIGHT. SAID COATING COMPOSITION HAS AN INCREASED CRITICAL PV VALUE AND SUBSTANTIALLY THE SAME FRICTION COEFFICIENT AS THAT OF A CONVENTIONAL ONE. THE DRY FILM OF THE COATING COMPOSITION ACTS AS A DURABLE, SOLID LUBRICANT.
Abstract:
GREASE LUBRICANTS FOR MILITARY AND INDUSTRIAL USE CONSISTING OF ABOUT 65 TO 75 WEIGHT PERCENT TRIMETHYLOLPROPANE ESTER OF STRAIGHT CHAIN MONOCARBOXYLIC ACIDS HAVING 5 TO 7 CARBON ATOMS, 25 TO 35 WEIGHT PERCENT POLYTETRAFLUOROETHYLENE HAVING A MOLECULAR WEIGHT 10,000 TO 50,000 AND 0.25 TO 0.75 WEIGHT PERCENT SODIUM NITRITE, THE GREASE EXHIBITING EXCELLENT EXTREME PRESSURE PROPERTIES AS WELL AS RUST PREVENTION CHARACTERISTICS.
Abstract:
Stable grease compositions for use with equipment at extremely low temperatures, the greases consisting of about 69 to 78 weight percent polysiloxanes, the balance being tetrafluoroethylene polymer having a molecular weight of 10,000 - 50,000, a softening point of 321.1 percent, particle size less than 30 microns in diameter, and supplied as a 7.5 percent suspension in trichlorotrifluoroethane.
Abstract:
Stable grease compositions having excellent extreme pressure properties, among other, the grease consisting of about 68-73.5 weight percent bis(m-phenoxyphenyl) ether having a pour point of +4.5* C., balance being tetrafluoroethylene polymer having a molecular weight 10,000-50,000, softening point 321.1* C., particle size less than 30 microns in diameter, and supplied as a 7.5 percent suspension is trichlorotrifluoroethane.
Abstract:
Compositions consisting essentially of about 1 weight percent carbon black,rom about 20 to about 35 weight percent polytetrafluoroethylene and from about 79 to about 64 weight percent of a material selected from the group consisting of isobutylene-isoprene copolymer and ethylene-propylene rubber are disclosed as being useful as protective fillers in situations where the protective filler is subjected to high temperatures and pressures.