Accession Number : AD0906438

Title :   Thermal Oxidation-Polymeric Coating Treatments of High Modulus Graphite Fibers.

Descriptive Note : Technical rept. May 68-Sep 69,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Dauksys,R. J.

Report Date : OCT 1972

Pagination or Media Count : 56

Abstract : The interfacial bond between polyvinyl alcohol (PVA) and water-sized high modulus graphite fibers and an epoxy matrix was improved by thermal oxidation of the fiber surface by a propane-generated flame followed by application of various types of thermoplastic coatings and subsequent impregnation with the epoxy resin solution. This approach was followed in an attempt to obtain a 'ductile' fiber-matrix interface. The mechanical property results indicated that improvement in composite interlaminar shear strength was attained without apparent loss of fiber strength (compared to composites fabricated with the same types of yarn, but untreated). Also, scanning electron microscopy was utilized to obtain photomicrographs of treated fibers and fractured composites. (Author)

Descriptors :   (*CARBON FIBERS, OXIDATION), (*COMPOSITE MATERIALS, *PLASTIC COATINGS), GRAPHITE, CERAMIC FIBERS, POLYVINYL ALCOHOL, EPOXY RESINS, THERMAL PROPERTIES, CHEMICAL REACTIONS, THERMOPLASTIC RESINS, DUCTILITY, MECHANICAL PROPERTIES, LAMINATES, SHEAR STRESSES, ELECTRON MICROSCOPY, PHOTOMICROGRAPHY, FRACTURE(MECHANICS), HEAT TREATMENT, POLYMERS, IMPREGNATION, FLEXURAL STRENGTH

Subject Categories : Coatings, Colorants and Finishes
      Laminates and Composite Materials
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE