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High-temperature heat treatment of carbon microcoils obtained by chemical vapor deposition process and their properties

Published online by Cambridge University Press:  31 January 2011

Xiuqin Chen ,
Wan In-Hwang ,
Shiro Shimada ,
Mituhiro Fujii ,
Hiroshi Iwanaga  and
Seiji Motojima
Xiuqin Chen
Affiliation:
Faculty of Engineering, Gifu University, Gifu 501–1193, Japan
Wan In-Hwang
Affiliation:
Faculty of Engineering, Gifu University, Gifu 501–1193, Japan
Shiro Shimada
Affiliation:
School of Engineering, Hokkaido University, Sapporo 060–0813, Japan
Mituhiro Fujii
Affiliation:
Faculty of Engineering, Nagasaki Institute of Applied Science, Nagasaki 851–0123, Japan
Hiroshi Iwanaga
Affiliation:
Faculty of Engineering, Nagasaki University, Nagasaki 852–8521, Japan
Seiji Motojima*
Affiliation:
Faculty of Engineering, Gifu University, Gifu 501–1193, Japan
*
a)Address all correspondence to this author. e-mail: motojima@apchem.gifu-u.ac.jp
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Abstract

Carbon microcoils obtained by the catalytic pyrolysis of acetylene at 770 °C were heat treated at 3000 °C for 6 h in a CO + CO2 atmosphere. The effect of the heat treatment on the morphology, microstructure, and properties was examined. The coiling morphology of the carbon coils was almost preserved even after the heat treatment, though it became brittle. The ruptured cross section of the two fibers, which form the coils, generally has either a trigonal pyramidlike form or negative pyramidal hollow. These characteristic ruptured patterns demonstrate the growth mechanism of the carbon coils. Distinct graphite layers (d = 0.339 nm) were developed by the heat treatment with an inclination of 10–40° versus the fiber axis to form a “herringbone” structure. The bulk electrical resistivity, density, and specific surface area were 10–0.1 Ωcm, 2.2077–2.087 g/cm3, and 6–8 m2/g, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 808 - 814
Copyright
Copyright © Materials Research Society 2000

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