A Study on Synthesis of High Purity <TEX>$beta$</TEX>-SiC Fine Particle from Ethylsilicate(I) -Reaction Conditon, Yeild and Properties of <TEX>$beta$</TEX>-SiC-

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J. Korean Ceram. Soc. > Volume 25(5); 1988 > Article

Journal of the Korean Ceramic Society 1988;25(5): 473.

Ethyl Silicate를 고순도 $beta$-SiC미분말 합성에 관한 연구(I) 반응조건과 $beta$-SiC의 생성율 및 특성

최용식, 박금철¹

국립공업시험원 도자기시험소
¹한양대학교 공과대학 무기재료공학과

A Study on Synthesis of High Purity $beta$-SiC Fine Particle from Ethylsilicate(I) -Reaction Conditon, Yeild and Properties of $beta$-SiC-

ABSTRACT

In order to obtain the high purity $beta$-SiC powder that possesses the excellent sinterability and is close to the spherical shape, the carbon black was mixed into the composition of Si(OC2H5)4-H2O-NH3-C2H5OH which the monodispersed spherical fine particles is formed the hydrolysis of Ethylsilicate and the mixture was carbonized under an argon atmosphere. Particle shpae, size and the yield of $beta$-SiC powder were investigated according to the molar ratio of carbon/alkoxide and variations of reaction temperature and reaction time. The results of this study are as follow ; 1) The yield of $beta$-SiC gained from the reaction for one hour at 150$0^{circ}C$ almost got near 100% and the particle size of $beta$-SiC from the reaction for 15 hrs at 150$0^{circ}C$ was 0.2${mu}{textrm}{m}$ on the average and close to the spherical shape agglomerate state. 2) When the molar ratio carbon/alkoxide is over 3.1 and the reaction occurs at 145$0^{circ}C$ for 5hrs, the carbon content has not an effect on the kind of crystal of product.