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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.5 (2001)  >  pp.838-841

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.5 (2001)   pp.838 - 841 Next article>>

Synthesis of Vapor-Grown Carbon Fibers Using Nanocrystalline Fe75Si15B10 Alloy as a Catalyst

Ken Unno1), Hidehiro Kudo1), Atsunori Kamegawa1), Hitoshi Takamura1), Masuo Okada1), Reijiro Takahashi2) and Junichiro Yagi2)
1) Department of Materials Science, Graduate School of Engineering, Tohoku University
2) Institute for Advanced Materials Processing, Tohoku University


The synthesis of vapor-grown carbon fibers (VGCFs) using the nanocrystalline Fe75Si15B10 alloy as a novel catalyst has been investigated, and the growth process of VGCFs was discussed. The nanocrystalline Fe75Si15B10 alloy with fine bcc-Fe grains less than about 20 nm was prepared by the melt spinning technique followed by annealing. VGCFs with a diameter of less than about 40 nm were successfully prepared using the nanocrystalline Fe75Si15B10 catalyst at 773 K under 80%CO–20%H2 atmosphere. High-resolution transmission electron microscopic characterization indicated that the VGCFs catalytically generated over the Fe75Si15B10 nanocrystal surfaces at both 773 K and 873 K most likely have a tubular-type structure, in which the graphite sheets were stacked parallel to the fiber axis. The Fe75Si15B10 catalyst particles appear to be made of the single-phase Fe3C grains, which is in contrast to the Fe91Zr7B2 catalyst particles previously studied by us. The formation of Fe3C leads to the brittleness of catalyst particles and results in a growth of filamentous carbon.


Keyword:
vapor-grown carbon fiber, nanocrystalline Fe75Si15B10 alloy, growth rate, carbon monoxide, hydrogen, catalyst

Received: November 14, 2000
Accepted: March 07, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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