Accession Number : AD0800843

Title :   EXPLORATORY DEVELOPMENT OF GRAPHITE MATERIALS.

Descriptive Note : Summary technical rept. 1 Mar 64-1 Jun 65,

Corporate Author : UNION CARBIDE CORP LAWRENCEBURG TN CARBON PRODUCTS DIV

Personal Author(s) : Lafyatis, P. G. ; Carter, M. B.

Report Date : JUN 1966

Pagination or Media Count : 33

Abstract : Five trials were made with the multiaxial mold to evaluate the tooling and molding procedure. Graphite cloth laminated composites prepared both using the conventional atmospheric-soak technique; and using cloth that had been vacuum degassed prior to soaking in resin were cured at molding pressures from 100 to 875 lbs./sq. in. The laminates increased in flexural strength as the molding pressure was increased to 700 lbs./sq. in. Flexural specimens prepared from 2-strand VYB yarn and ERRA-0300 epoxy resin were shown to have cured strengths in excess of 70,000 lbs./sq. in. Twelve rings were fabricated from the high strength VYB-70-1/2 carbon yarn and ERLA-0400 epoxy resin for apparent tensile strength by the NOL ring test. These gave apparent tensile strengths of 47,000 to 53,000 lbs./sq. in., and calculated ultimate fiber stresses of from 90,000 to 123,000 lbs./sq. in. Trials were made to study the feasibility of forming grade JTA into shapes other than cylindrical plugs. Flat plates can be formed directly and then deformed by hot-pressing. Extrusion trials with JTA have not been successful. Five plugs of refractory fibrous graphite composites formed an excellent oxidation-resistant coating during testing at 1600 C for 200 seconds in air.

Descriptors :   *COMPOSITE MATERIALS), (*GRAPHITE, (*FIBERS, GRAPHITE), (*LAMINATED PLASTICS, GRAPHITE), MOLDINGS, EXTRUSION, VACUUM, EPOXY RESINS, FILAMENTS, STRESSES, TENSILE PROPERTIES, OXIDATION, PHYSICAL PROPERTIES.

Subject Categories : Refractory Fibers
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE