High Temperature Mullitization of Kaolin-Al Mixture

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J. Korean Ceram. Soc. > Volume 21(4); 1984 > Article

Journal of the Korean Ceramic Society 1984;21(4): 327.

Kaolin-Al 혼합물의 고온 Mullite 화 반응

박정현, 박찬욱, 배원태¹

연세대학교 요업공학과
¹경상대학교 재료공학과

High Temperature Mullitization of Kaolin-Al Mixture

ABSTRACT

Proper amount of $Al_2O_3$ must be added to increase the yield of mullite which is formed from free silica decomposed from kaolin. The previous study has suggested that Al powder may be a good $Al_2O_3$ supply source at 1400~150$0^{circ}C$. In this study the application of Al powder is discussed about its mullitization behavior in the higher temperature range of 1500~175$0^{circ}C$ the results of which compared with those obtained from the reactive $Al_2O_3$ and activated $Al_2O_3$. The oxdation and reaction stages of Al powder were analyzed by DTA crystal growth andmorphology of the mullite were observed by SEM and the yields of the mullite were compared according to their solubilities in HF solution.