Synthesis of vapor-grown carbon fibers using nanocrystalline Fe75Si15B10 alloy as a catalyst

K. Unno, H. Kudo, Atsunori Kamegawa, H. Takamura, M. Okada, R. Takahashi, J. Yagi

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)838-841
Number of pages4
JournalMaterials Transactions
Volume42
Issue number5
DOIs
Publication statusPublished - 2001 Jan 1

Keywords

  • Carbon monoxide
  • Catalyst
  • Growth rate
  • Hydrogen
  • Nanocrystalline FeSiB alloy
  • Vapor-grown carbon fiber

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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