| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high strength carbon fiber suitable for a composite material requiring high composite performance.SOLUTION: The method for manufacturing a carbon fiber comprises: flameproofing a carbon fiber precursor acrylic fiber bundle at a temperature of 200-300°C in an acidified atmosphere; pre-carbonizing the obtained flameproof fiber bundle at the maximum temperature of 500-900°C in an inert atmosphere; and carbonizing the obtained pre-carbonized fiber bundle at the maximum temperature of 1200-2500°C in an inert atmosphere. The pre-carbonization introduces the flameproof fiber bundle into a pre-carbonization furnace filled with an inert atmosphere. A period of time for the flameproof fiber bundle to pass through the section of an inert atmosphere temperature of 200°C or more and less than 250°C is 6-10 seconds and a period of time for the flameproof fiber bundle to pass through the section of an inert atmosphere temperature of 250°C or more and 400°C or less is 18-36 seconds. The supply amount of inert gas supplied into the pre-carbonization furnace is 1.0-5.0 Nmto a flameproof fiber bundle of 1 kg introduced into the pre-carbonization furnace.</p> |
