J. Phys. IV France 03 (1993) C3-599-C3-606
Preparation and properties of coiled carbon fibers by the catalitic pyrolysis of acetyleneS. MOTOJIMA1, I. HASEGAWA1, S. KAGIYA1, S. ASAKURA1, M. KAWAGUCHI2 and H. IWANAGA3
1 Department of Applied Chemistry, Faculty of Engineenng Gifu University, Gifu 501-11, Japan
2 Central Glass Co. Ltd., Japan
3 Nagasaki University, Japan
Microcoiled carbon fibers were obtained by the Ni catalyzed pyrolysis of acetylene at 600-800°C. The presence of small amounts of a sulfur compound impurity was indispensable for the growth of the coiled carbon fibers in high yield with good reproducibility. The optimum growth temperature was 750°C irrespective of the kind of sulfur compounds used as the impurity. The optimum impurity gas flow rate was restricted to a very narrow range depending on the impurity type. The maximum yield (about 50 %) of the coiled carbon fibers was obtained using thiophene. Some properties of the coiled carbon fibers were examined. A new growth mechanism for the coiled carbon fibers will be presented.
© EDP Sciences 1993