Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1987-04-02
1992-10-20
Kunemund, Robert
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
4234474, 4234476, 264 292, D01F 912
Patent
active
051568314
ABSTRACT:
Hollow carbon fibers and carbon fibers having a generally C-shaped transverse cross-sectional area are produced by extruding a carbonaceous anisotropic liquid precursor through a spinneret 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.degree. C. to 1000.degree. C. for 1 to 5 minutes, and heating the filament in an inert carbonizing environment at a temperature in the range of 1550.degree. C. to 1600.degree. 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.
REFERENCES:
patent: 3478389 (1969-11-01), Bradley et al.
patent: 3600491 (1971-08-01), Shimada et al.
patent: 3715422 (1973-02-01), Chopra et al.
patent: 3949115 (1976-04-01), Tamura et al.
patent: 4016247 (1977-04-01), Otani et al.
patent: 4017327 (1977-04-01), Lewis et al.
patent: 4208267 (1980-06-01), Diefendorf et al.
patent: 4402928 (1983-09-01), Lewis et al.
patent: 4461855 (1984-07-01), Phillips
patent: 4628001 (1986-12-01), Sasaki et al.
Singer, Leonard S., "The Mesophase and High Modulus Carbon Fibers from Pitch," Carbon, vol. 16, pp. 409-415 (1978).
Berg, et al, "Friction and Wear of Graphite Fiber Composites," NBS Journal of Research, vol. 76C, Nos. 1 and 2, Jun. 1972.
Singer, Leonard S., "Carbon Fibers From Mesophase Pitch," Fuel, vol. 60, Sep. 1981, pp. 839-847.
Edie Danny D.
Fain Charles C.
Clemson University
Kunemund Robert
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