Accession Number : ADA309361

Title :   Friction and Wear in Cryogenic Liquids for Composites of Phenolic and of Polytetrafluoroethylene of Various Particle Sizes and Concentrations.

Descriptive Note : Technical note,

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

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

PDF Url : ADA309361

Report Date : MAY 1969

Pagination or Media Count : 19

Abstract : Experiments conducted with phenolic-PTFE (polytetrafluoroethylene) composites sliding against 440-C steel in liquid nitrogen and in liquid hydrogen showed that lubricating properties of phenolic can be improved by the addition of as little as 15 weight percent of PTFE. Experiments further showed that 15 weight percent PTFE of the 0.2- to 8-micron particle size gave the best results in both liquid nitrogen and in liquid hydrogen. Compressive-modulus and shear-strength tests at room temperature and in liquid nitrogen indicated that these properties were reduced by a factor of 2 to 3 by the addition of 15 weight percent PTFE.

Descriptors :   *PARTICLE SIZE, *LIQUIDS, *COMPOSITE MATERIALS, *WEAR, *FRICTION, *CRYOGENICS, TEST AND EVALUATION, POLYMERS, STEEL, ROOM TEMPERATURE, HYDROCARBONS, LIQUID HYDROGEN, LIQUID NITROGEN, COMPRESSIVE STRENGTH, LUBRICATION, CONCENTRATION(CHEMISTRY), SLIDING, SHEAR STRENGTH, CARBON PHENOLIC MATERIALS.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials
      Lubricants and Hydraulic Fluids
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE