Accession Number : ADA330163

Title :   Some Effects of Composition on Friction and Wear of Graphite-Fiber-Reinforced Polyimide Liners in Plain Spherical Bearings

Descriptive Note : Technical paper

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

Personal Author(s) : Sliney, Harold E. ; Jacobson, Thomas P.

PDF Url : ADA330163

Report Date : MAY 1978

Pagination or Media Count : 23

Abstract : Oscillating, plain spherical bearings with graphite-fiber-reinforced polyimide (GFRPI) liners were tested for friction and wear from 25 deg to 315 deg C. A condensation polymer was compared with an addition polymer, and a high-modulus fiber was compared with a lower cost, low-modulus fiber. All polymer-fiber combinations gave friction coefficients from 0.05 to 0.18 and low wear. Adding CdO and CdI2 reduced the wear of degassed bearings in dry air. These additives were not needed when the bearing liners contained adsorbed moisture. Although, at 25 deg C, MoS2 reduced the friction and wear of the base composite at unit loads above 7.0x10(exp 7) N/m2 (10,000 psi), it had no beneficial effect at lighter loads.

Descriptors :   *BEARINGS, *GLASS REINFORCED PLASTICS, FIBER REINFORCED COMPOSITES, LUBRICANTS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE