Synthesis of $\beta$-SiC Whiskers by the Carbothermal Reduction of Kaolin

카올린의 환원 열탄화법에 의한 베타 탄화규소 휘스커의 합성

  • 오세정 (인하대학교 무기재료공학과) ;
  • 류종화 (인하대학교 무기재료공학과) ;
  • 조원승 (인하대학교 무기재료공학) ;
  • 최상욱 (인하대학교 무기재료공학과)
  • Published : 1998.12.01

Abstract

${\beta}$-Silicon carbide(${\beta}$-SiC) whiskers could be synthesized by the carbothermal reduction of kaolin at tem-peratures between 1400 and 1500$^{\circ}C$. The whiskers were grown up to about 1150 of aspect ratio by VS mechanism (showing tapering tips) and to about 45 of that by VLS mechanism (showing round droplet tips) respectively. Hydrocarbon like methane in the reaction atmosphere promoted the formation of gaseous il-icon monoxide(SiO) from silicon dioxide(SiO2) and subsequently reacted with it to form whiskers. The for-mation of ${\beta}$-SiC whiskers increased with increasing carbon content(to 30 wt%) and reaction temperatures. The max. yield of ${\beta}$-SiC whiskers was 15% at 1500$^{\circ}C$ under 20%CH4/80%H2.

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