Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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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

솔-젤 공정으로 제조된 SiO2-C 복합 전구체를 사용하여 열탄소환원법에 의한 β-SiC 분말 합성에 금속 Si 첨가가 미치는 영향

  • Jo, Yung-Chul (Interfacial Engineering Reserch Center, Korea Institute of Science and Technology) ;
  • Youm, Mi-Rae (Interfacial Engineering Reserch Center, Korea Institute of Science and Technology) ;
  • Yun, Sung-Il (Interfacial Engineering Reserch Center, Korea Institute of Science and Technology) ;
  • Cho, Gyoung-Sun (Interfacial Engineering Reserch Center, Korea Institute of Science and Technology) ;
  • Park, Sang-Whan (Interfacial Engineering Reserch Center, Korea Institute of Science and Technology)
  • 조영철 (한국과학기술연구원 계면제어연구센터) ;
  • 염미래 (한국과학기술연구원 계면제어연구센터) ;
  • 윤성일 (한국과학기술연구원 계면제어연구센터) ;
  • 조경선 (한국과학기술연구원 계면제어연구센터) ;
  • 박상환 (한국과학기술연구원 계면제어연구센터)
  • Received : 2013.10.01
  • Accepted : 2013.11.18
  • Published : 2013.11.30
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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.

Keywords

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