Formationof Mullite and Effect of <TEX>$TiO_2$</TEX> on Mullitization

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J. Korean Ceram. Soc. > Volume 13(4); 1976 > Article

Journal of the Korean Ceramic Society 1976;13(4): 25.

물라이트합성과 $TiO_2$ 의 효과에 관하여

모경화, 정병진, 장성도

한국과학기술연구소 요업재료연구실

Formationof Mullite and Effect of $TiO_2$ on Mullitization

ABSTRACT

Mullite was synthesized by using kaolin and $alpha$-alumina, and halloysite and aluminum hydroxide as raw materials at the various temperature in the range of 1200$^{circ}$-1750$^{circ}$C. The degree of mullitization was measured respectively by a quantitative X-ray diffraction method and a chemical analysis method. The rate and the maximum degree of mullitization were found to increase with temperature . The reaction completed at 1600$^{circ}$Cfor less than 30 minutes, and yielded 98% mulllite inpurity in the case of kaolin-Al(OH)3. TiO$_2$ up to 3% was added to the batches of kaolin-Al(OH)$_3$. the effect of addition on the mullitization was investigated and found to decrease the sintering temperature for the mullitization. The mechanism of TiO$_2$ addition on the formation of mullite was also discussed.