Pitch-based carbon fibers and pitch compositions and precursor f

Details Pitch-based carbon fibers and pitch compositions and precursor f Pitch-based carbon fibers and pitch compositions and precursor f

1983-08-23

1986-05-20

Dixon, Jr., William R.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

4234476, 208 22, 208 44, 264 292, D01F 912

Patent

active

045900558

ABSTRACT:
The invention provides carbon fibers having mechanical properties equival to or even better than those of the polyacrylonitrile-based carbon fibers from a bituminous material, e.g. coal tar pitch, as the starting material. The starting pitch is first partially hydrogenated in tetrahydroquinoline under specific conditions followed by a heat treatment to give a pitch composition suitable for spinning which can be characterized by several parameters including the proportions of the carbons and hydrogens having different chemical shifts in the NMR analysis. The pitch composition for spinning is then subjected to spinning under specific conditions including the temperature condition for controlling the viscosity behavior of the molten pitch composition determined by use of the Andrade's equation and the pitch filament is then infusibilized in an oxidative atmosphere and carbonized in an inert atmosphere into carbon fibers having a tensile strength of at least 200 kg/mm.sup.2 and a tensile modulus of at least 10 tons/mm.sup.2.

REFERENCES:
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patent: 4330394 (1982-05-01), Newman
patent: 4376747 (1983-03-01), Nazem
patent: 4391788 (1983-07-01), Uemura et al.
patent: 4397830 (1983-08-01), Uemura et al.
patent: 4431623 (1984-02-01), Fug

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