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Synthesis of SiC microtube with villus-like morphology and SiC fiber

Published online by Cambridge University Press:  03 March 2011

Jae-Won Kim ,
Seoung-Soo Lee ,
Yeon-Gil Jung ,
Baig-Gyu Choi ,
Chang-Yong Jo  and
Ungyu Paik
Jae-Won Kim
Affiliation:
Department of Materials Science and Engineering, Changwon National University, Changwon, Kyungnam 641-773, Republic of Korea
Seoung-Soo Lee
Affiliation:
Department of Materials Science and Engineering, Changwon National University, Changwon, Kyungnam 641-773, Republic of Korea
Yeon-Gil Jung*
Affiliation:
Department of Materials Science and Engineering, Changwon National University, Changwon, Kyungnam 641-773, Republic of Korea
Baig-Gyu Choi
Affiliation:
High Temperature Materials Group, Korea Institute of Machinery and Materials, Changwon, Kyungnam 641-010, Republic of Korea
Chang-Yong Jo
Affiliation:
High Temperature Materials Group, Korea Institute of Machinery and Materials, Changwon, Kyungnam 641-010, Republic of Korea
Ungyu Paik
Affiliation:
Department of Ceramic Engineering, Hanyang University, Seoul 133-791, Republic of Korea
*
a) Address all correspondence to this author. e-mail: jungyg@changwon.ac.kr
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Abstract

Silicon carbide (SiC) microtubes were synthesized and characterized via a vapor–solid (VS) reaction of carbon fiber (Csolid) and SiO(gas). The synthesis mechanisms were investigated. The precursor led complete conversion of [SiO(gas) + C(solid)] into [SiC(solid) + CO(gas)] through overall reaction under inert gas flow at and above 1350 °C. Carbon fibers with small surface area (0.7–2.0 m2 g−1) were gradually converted to SiC microtubes with large specific surface area (45–63 m2 g−1). Inner surface of SiC microtubes indicated a villus-like morphology, which consisted of submicron-sized SiC villi. The outer surface of the SiC microtubes was smooth. Inner surface morphology of SiC microtubes was dependent upon synthesizing temperature. Thickness of villus-like layer in SiC microtubes increased with increasing synthesizing temperature, showing 0.25 and 0.5 at 1350 and 1400 °C, respectively. Both VS and gas–liquid–solid (VLS) growth mechanisms were investigated in synthesis of SiC fiber as a reaction byproduct, and the reaction was governed by both growth mechanisms.

Keywords

CeramicMorphologyNucleation and growth

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Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 409 - 416
Copyright
Copyright © Materials Research Society 2005

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