Synthesis of vapor -- grown carbon fibers using nanocrystalline Fe{sub}91Zr{sub}7B{sub}2 alloy as a catalyst

摘要

The synthesis of vapor-grown carbon fibers (VGCFs) using the nanocrystalline Fe{sub}91Zr{sub}7B{sub}2 alloy as a novel catalyst, and the growth process of these VGCFs, have been investigated. We selected the nanocrystalline Fe{sub}91Zr{sub}7B{sub}2 alloy as a novel catalyst for VGCF synthesis. The nanoerystalline Fe{sub}91Zr{sub}7B{sub}2 alloy with line 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 6μm were successfully prepared, by using a nanoerystalline Fe{sub}91Zr{sub}7B{sub}2 alloy annealed at 873 K under a 80％CO-20％H{sub}2 mixture. From HREM observation, it was found that the catalyst particle was made of fine bce-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 Fe{sub}91Zr{sub}7B{sub}2 alloy can be described by two major stages, i.e., "the separation of catalyst particles" and "fiber growth."