High-strength carbonaceous fiber

Details High-strength carbonaceous fiber High-strength carbonaceous fiber

1985-11-14

1987-06-09

Doll, John

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234472, 4234474, 4234476, 264 292, D01C 512, D01F 912

Patent

active

046719504

ABSTRACT:
A carbonaceous fiber having a carbon content of from 70 to 90%, a high tensile strength and a high modulus of elasticity, which is produced by a method which comprises preoxidizing an acrylic fiber in an oxidizing atmosphere at a temperature of from 10.degree. to 60.degree. C. below the decomposition point of said fiber, to prepare a preoxidized fiber having a degree of orientation of not less than 78% at an angle of X-ray diffraction (2.theta.) of 25.degree. and a specific gravity of from 1.30 to 1.40, pyrolyzing the preoxidized fiber in an inert gas atmosphere by passing the fiber firstly through a lower temperature zone having a temperature of not higher than 750.degree. C. and then through a higher temperature zone having a temperature of from 750.degree. to 950.degree. C., during the pyrolysis controlling the tension of the fiber so that the change of the fiber length during pyrolyzing is from +16% to -8.8% based on the length of the preoxidized fiber.

REFERENCES:
patent: 3027222 (1962-03-01), Wilkinson
patent: 3454362 (1969-07-01), Spry
patent: 3841079 (1974-10-01), Ram et al.
patent: 4024227 (1977-05-01), Kishimoto et al.
patent: 4073870 (1978-02-01), Saji et al.
patent: 4526770 (1985-07-01), Pepper et al.

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