A Study on Synthesis of High Purity <TEX>$beta$</TEX>-SiC Fine Powders from Ethyl Silicate(III) Effect of Additives

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J. Korean Ceram. Soc. > Volume 26(3); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(3): 416.

Ethyl Silicate를 이용한 고순도 $beta$-SiC 미분말 합성에 관한 연구(III) 첨가제의 영향

최용식, 박금철¹

국립공업시험원 도자기시험소
¹한양대학교공과대학 무기재료공학과

A Study on Synthesis of High Purity $beta$-SiC Fine Powders from Ethyl Silicate(III) Effect of Additives

ABSTRACT

The particle size of synthesized SiC powders was decreased with increasing carbon content when the mixture of carbon and silica was carbonized at 1, 45$0^{circ}C$ after hydrolysis of the mixture with the ranges of 3.1 to 3.5 in the mole ratio of Carbon/Alkoxide. The reacted fraction of $beta$-SiC nearly had nothing to do with the mole ratio of Carbon/Alkoxide. When the reaction was made by adding 0.5wt% additives in the composition of 3.1 in the mole ratio of carbon/alkoxide, the additives decreased the yield of $beta$-SiC and its sequence was Ba2O3>B>Fe>Al>Al2O3>Si. The effect of additives promoted the transformation of $beta$-SiC to $alpha$-SiC form and shwoed the increasing tendency of lattice constant. The two colors of $beta$-SiC powder came out : one was the black grey with addition of Al, Al2O3 and B the other the light grey with addition of Fe, B2O3 and Si.