J. Phys. IV France 05 (1995) C5-1061-C5-1068
Vapour Growth of Micro-Coiled Ceramic Fibers and their PropertiesS. Motojima1, I. Hasegawa1 and H. Iwanaga2
1 Department of Applied Chemistry, Faculty of Engineering, Gifu University, Gifu 501-11, Japan
2 Faculty of Liberal Arts, Nagasaki University, Nagasaki 852, Japan
Micro-coiled fibers of carbon, SiC, Si3N4 TiC, ZrC and HfC were prepared by a metal-impurity activated chemical vapor deposition or vapour phase metallizing of the coiled carbon fibers. The growth conditions, morphology, growth mechanism and some properties were examined. The double-coiled carbon fibers were prepared using acetylene as a carbon source and various powders or plates of transition metals, metal carbides, MoS2, Ti2O3, and Ni single crystal plate as a catalyst at 650-850°C. The triple-coiled Sic fibers were prepared using coked rice husks and/or SiO as a Si-source and Ni, Cr or Fe as a catalyst at 1400-1500°C. The double-coiled Tic fibers were prepared by the PCl3 activated CVD process on a graphite substrate using a Pt+Si or Pd+Si mixed catalyst at 1050-1250°C.
© EDP Sciences 1995