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J. Korean Ceram. Soc. > Volume 50(6); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(6): 402.
doi: https://doi.org/10.4191/kcers.2013.50.6.402
솔-젤 공정으로 제조된 SiO2-C 복합 전구체를 사용하여 열탄소환원법에 의한 β-SiC 분말 합성에 금속 Si 첨가가 미치는 영향
조영철, 염미래, 윤성일, 조경선, 박상환
한국과학기술연구원 계면제어연구센터
Effects of Metallic Silicon on the Synthsis of β-SiC Powders by a Carbothermal Reduction Using SiO2-C Hybrid Precursor Fabricated by a Sol-gel Process
Yung-Chul Jo, Mi-Rae Youm, Sung-Il Yun, Gyoung-Sun Cho, Sang-Whan Park
Interfacial Engineering Reserch Center, Korea Institute of Science and Technology
ABSTRACT
The objective of this study was to develop a synthesis process for ${beta}$-SiC powders to reduce the synthesis temperature and to control the particle size and to prevent particle agglomeration of the synthesized ${beta}$-SiC powders. A phenol resin and TEOS were used as the starting materials for the carbon and Si sources, respectively. $SiO_2$-C hybrid precursors with various C/Si mole ratios were fabricated using a conventional sol-gel process. ${beta}$-SiC powders were synthesized by a carbothermal reduction process using $SiO_2$-C hybrid precursors with various C/Si mole ratios (1.6 ~ 2.5) fabricated using a sol-gel process. In this study, the effects of excess carbon and the addition of Si powders to the $SiO_2$-C hybrid precursor on the synthesis temperature and particle size of ${beta}$-SiC were examined. It was found that the addition of metallic Si powders to the $SiO_2$/C hybrid precursor with excess carbon reduced the synthesis temperature of the ${beta}$-SiC powders to as low as $1300^{circ}C$. The synthesis temperature for ${beta}$-SiC appeared to be reduced with an increase of the C/Si mole ratio in the $SiO_2$-C hybrid precursor by a direct carburization reaction between Si and excess carbon.
Key words: Silicon carbide, SiC, Sol-gel process, Carbothermal reduction, Powder synthesis
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