Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1986-01-21
1992-09-22
Kunemund, Robert
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
4234471, 4234474, 4234476, 264 292, 428367, 428397, 428398, D01F 912
Patent
active
051495171
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: 3340571 (1967-09-01), Bishop et al.
patent: 3478389 (1969-11-01), Bradley et al.
patent: 3639953 (1972-02-01), Kimura et al.
patent: 4017327 (1977-04-01), Lewis et al.
patent: 4208267 (1980-06-01), Diefendorf et al.
patent: 4306911 (1981-12-01), Gordon et al.
patent: 4356158 (1982-10-01), Ishikawa et al.
patent: 4461855 (1984-07-01), Phillips
patent: 4504454 (1985-03-01), Riggs
patent: 4628001 (1986-12-01), Sasaki et al.
Singer, "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
LandOfFree
High strength, melt spun carbon fibers and method for producing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High strength, melt spun carbon fibers and method for producing , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High strength, melt spun carbon fibers and method for producing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1066928