Synthesis of Vapor-Grown Carbon Fibers Using Nanocrystalline Fe91Zr7B2 Alloy as a Catalyst

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  • Unno Ken
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Kudo Hidehiro
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Kamegawa Atsunori
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Takamura Hitoshi
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Okada Masuo
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Watanabe Yoshinori
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Takahashi Reijiro
    Institute for Advanced Materials Processing, Tohoku University
  • Yagi Junichiro
    Institute for Advanced Materials Processing, Tohoku University

書誌事項

タイトル別名
  • Synthesis of Vapor—Grown Carbon Fibers Using Nanocrystalline Fe<SUB>91</SUB>Zr<SUB>7</SUB>B<SUB>2</SUB> Alloy as a Catalyst
  • Synthesis of Vapor&mdash;Grown Carbon Fibers Using Nanocrystalline Fe<SUB>91</SUB>Zr<SUB>7</SUB>B<SUB>2</SUB> Alloy as a Catalyst

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説明

The synthesis of vapor-grown carbon fibers (VGCFs) using the nanocrystalline Fe91Zr7B2 alloy as a novel catalyst, and the growth process of these VGCFs, have been investigated. We selected the nanocrystalline Fe91Zr7B2 alloy as a novel catalyst for VGCF synthesis. The nanocrystalline Fe91Zr7B2 alloy with fine bcc-Fe grains (∼20 nm) was prepared by a melt-spinning technique followed by annealing at 873 K for 5 min. VGCFs with a width ranging from 50 to 300 nm and a maximum length of about 6 μm were successfully prepared, by using a nanocrystalline Fe91Zr7B2 alloy annealed at 873 K under a 80%CO–20%H2 mixture. From HREM observation, it was found that the catalyst particle was made of fine bcc-Fe grains, and the VGCF consisted of graphite platelets with the spacing 0.396 nm, that were stacked in a direction parallel to the base of the catalyst particle and perpendicular to the fiber axis. The growth process of the VGCF using the nanocrystalline Fe91Zr7B2 alloy can be described by two major stages, i.e., “the separation of catalyst particles” and “fiber growth.”

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