| 摘要 |
PURPOSE: To produce fluorine-treated graphite fiber having excellent electroconductivity and excellent in stability in air and thermal stability by heat-treating specific vapor growth carbon fiber, followed by treating the resultant graphite fiber having a specific crystal structure with fluorine. CONSTITUTION: This fluorine-treated graphite fiber is produced by heat-treating vapor growth carbon fiber, which is formed through the pyrolysis of a mixture gas of a hydrocarbon compound such as benzene with hydrogen gas in the presence of ultrafine particles of a metallic catalyst, (e.g. metal iron particles) floating in a high-temperature air at the temperature near to 1,100 deg.C, at 2,800-3,000 deg.C to form graphite fiber having a crystal structure where carbon hexagonal reticulated plane is parallel to the fiber axis and is oriented in an annual ring-like state, followed by making the graphite fiber contact with fluorine at <=60 deg.C to form fluorine-treated graphite fiber comprising an intercalation compound of graphite fiber with fluorine, in which the repeated period length in the direction of the C-axis of a crystal ranges from 10 Å to 40 Å. The fluorine-treated graphite fiber has 5.5 times the value of the electroconductivity of untreated graphite fiber and is excellent in thermal stability. |
