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J. Korean Ceram. Soc. > Volume 36(12); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(12): 1296.
뮬라이트 결합 알루미나 캐스터블의 제조와 특성
천승호, 황규홍1, 전병세2
경남대학교 신소재공학부
1경상대학교 무기재료공학과
Preparation and Properties of Mullite Bonded Alumina Castable
In the preparation of a high alumina castable by the vibration casting method. the addition of microsilica (3.0wt%) as a deflocculant reduced water contents and enhanced flow value of castable. An additional addition of alumina cement (3.0wt%) led to an coagulation effect. Alumina fine particles (7.5wt%) were added to form mullite phase in matrix during heat treatment. Alumina cement used as binder induced liquid phase of silica at low temperature and the liquid phase of silica transformed into the mullite phase by the reaction with alumina fine particles. The activation energy for transforming mullite phase was 19.87kcal/mol. Compressive strength and modulus of rupture of the alumina castable were 900-1000kg/cm2 and 200-300kg/cm2 respectively. The resistance against corrosion of slag (15.71%) was improved comparing with conventional alumina castable
Key words: Microsilica, Alumina cement, Alumina, Flow value, Mullite
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