EXPLORATORY DEVELOPMENT OF GRAPHITE MATERIALS.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0800843
Entities
People
- M. B. Carter
- P. G. Lafyatis