Accession Number : ADA307801

Title :   Wear and Friction of Various Polymer Laminates in Liquid Nitrogen and 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. ; Ludwig, Lawrence P. ; Johnson, Robert L.

PDF Url : ADA307801

Report Date : NOV 1966

Pagination or Media Count : 17

Abstract : Wear and friction of polymer laminates were determined in liquid nitrogen and liquid hydrogen. Polymers included polytetrafluoroethylene (PTFE), phenol formaldehyde (phenolic), epoxy formaldehyde (epoxy), and melamine formaldehyde (melamine); fabrics included glass, graphite, cotton, and nylon. Wear and friction experiments were conducted with a 3/16-inch-radius hemispherically-tipped polymer laminate rider sliding on the flat surface of a rotating 304-stainless-steel disk. The sliding velocity was maintained at 2300 feet per minute. The polymer laminate riders were under a 1000-gram load against the disk. The results of the investigation indicate that a laminate of graphite fabric and phenolic resin is a potentially useful material for sliding contact in liquid nitrogen and that a laminate of glass fabric and PTFE resin is useful in liquid hydrogen. (The mechanical strengths of these materials were not evaluated.) Wear and friction of the laminates were appreciably higher in liquid hydrogen than in liquid nitrogen. p4

Descriptors :   *POLYMERS, *LAMINATES, *WEAR, *LIQUID HYDROGEN, *LIQUID NITROGEN, *FRICTION, VELOCITY, NYLON, GRAPHITE, GLASS, STRENGTH(MECHANICS), FABRICS, EPOXY COMPOUNDS, PHENOLS, FORMALDEHYDE, SLIDING CONTACTS, PHENOLIC PLASTICS, COTTON, MELAMINES.

Subject Categories : Polymer Chemistry
      Inorganic Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE