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

  • Jae-Won Kim (a1), Seoung-Soo Lee (a1), Yeon-Gil Jung (a1), Baig-Gyu Choi (a2), Chang-Yong Jo (a2) and Ungyu Paik (a3)...

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.

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a) Address all correspondence to this author. e-mail: jungyg@changwon.ac.kr

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

  • Jae-Won Kim (a1), Seoung-Soo Lee (a1), Yeon-Gil Jung (a1), Baig-Gyu Choi (a2), Chang-Yong Jo (a2) and Ungyu Paik (a3)...

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