| 摘要 |
PURPOSE:To mass-produce the titled carbon fiber having uniform fiber particle in a short time, by inserting a base material in which catalyst particles are dispersed into a furnace core pipe of electrical furnace kept at high temperature, introducing a mixed gas containing a hydrocarbon gas into the pipe, carrying out nucleus formation and length growth of fiber. CONSTITUTION:The base material 6 in which a catalyst is dispersed in a state of independent particle is set in the electrical furnace 9. Firstly, a mixed gas containing 0.1-4vol% of the hydrocarbon gas 2 is introduced at 1-10cm/min flow velocity into the furnace core pipe 4 having the base material temperature kept at 1,050-1,150 deg.C, and nucleus formation and length growth for 30-90min are carried out. As the temperature of the base material is raised, the flow velocity of the mixed gas is raised in a range of 5-50cm/min with rise in fiber diameter, and a feed amount of the hydrocarbon gas per unit time is raised, the thickness of the fiber 7 is enlarged, to give the desired carbon fiber.
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