HIGH STRENGTH, MELT SPUN CARBON FIBERS AND METHOD FOR PRODUCING SAME

Hollow carbon fibers and carbon fibers having a generally C-shaped transverse cross-sectional area (see Fig. 7) are produced by extruding a carbon­aceous anisotropic liquid precursor through a spinneret (14) having a capillary with a generally C-shaped cross-sectional area, into a fiber filament, co...

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Hauptverfasser: FAIN, CHARLES C, EDIE, DANNY DALE
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description Hollow carbon fibers and carbon fibers having a generally C-shaped transverse cross-sectional area (see Fig. 7) are produced by extruding a carbon­aceous anisotropic liquid precursor through a spinneret (14) having a capillary with a generally C-shaped cross-sectional area, into a fiber filament, controlling the viscosity of the molten precursor, the pressure of the molten precursor and the linear take-up speed of the filament to yield a fiber filament having a cross-sectional area shaped substantially like the shape of the cross-sectional area of the capillary and further having a line-origin microstructure, rendering the filament infusible, heating the filament in an inert pre-carbonizing environment at a temperature in the range of 600°C to 1000°C for 1 to 5 minutes, and heating the filament in an inert carbonizing environment at a temperature in the range of 1550°C to 1600°C for 5 to 10 minutes, to substantially increase the tensile strength of the filament. The carbon fiber filament so produced has a line-origin microstructure in which the origin line is located and shaped substantially as a line which constitutes the line formed by uniformly collapsing the perimeter of the transverse cross-sectional area of the fiber filament upon itself. The carbon fiber filament has a tensile strength greater than 200 ksi and as high as the 700 to 800 ksi range, yet a modulus of elasticity on the order of 25-35 msi. The top to bottom outside diameter of the fiber's transverse cross-sectional area is on the order of 30 to 50 microns, and the wall thicknesses are on the order of 8 to 15 microns.
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subjects APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS
CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS
MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS
NATURAL OR ARTIFICIAL THREADS OR FIBRES
SPINNING
TEXTILES
title HIGH STRENGTH, MELT SPUN CARBON FIBERS AND METHOD FOR PRODUCING SAME
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