Accession Number : AD0893841

Title :   Exploratory Development of High Strength, High Modulus Graphite Filaments.

Descriptive Note : Technical rept. 29 Mar 70-29 Jan 72,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Flom,Donald G. ; Gorowitz,Bernard ; Krutchen,Charles M. ; Roberts,Benjamin W. ; Sliva,Daniel E.

Report Date : JAN 1972

Pagination or Media Count : 158

Abstract : Exploratory development was conducted leading to high strength, high modulus graphite filaments based on polyacetylene precursors. The primary objective was to achieve a high elongation-to-break (0.8%) SIMULTANEOUSLY WITH HIGH STRENGTH (400,000 psi), high modulus (50 million psi), and large diameter. Strengths were obtained as high as 439,000 psi for small diameter filaments (0.37 mil) and in the 1-mil diameter range average strengths of 275,000 psi were obtained with one value as high as 324,000 psi. The later exhibited a modulus of 47 million psi, leading to an elongation- to-break of 0.7%. The latter properties were achieved at a graphitization temperature of 2550 C. A continuous process line was developed combining the operations of drawing, crosslinking, carbonization, graphitization, and surface treatment. This line was operated at a takeup speed of 10 feet/minute with excellent prospect for achieving higher speeds. (Author, modified-PL)

Descriptors :   (*GRAPHITE, FILAMENTS), (*REINFORCING MATERIALS, GRAPHITE), (*COMPOSITE MATERIALS, GRAPHITE), FIBERS, GRAPHITED MATERIALS, ALKYNES, CARBON, ELONGATION, RUPTURE, DRAWING(FORMING), CROSSLINKING(CHEMISTRY), MODULUS OF ELASTICITY, POLYMERS, RAYON, ACRYLONITRILE POLYMERS, TENSILE PROPERTIES, PLASTICIZERS, REINFORCED PLASTICS, PYROLYSIS, EXTRUSION, PROCESSING, EPOXY RESINS

Subject Categories : Laminates and Composite Materials
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE