Synthesis of Mullite from Kaolin and Industrial By-Products

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J. Korean Ceram. Soc. > Volume 36(1); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(1): 1.

Kaolin과 산업부산물을 이용한 Mullite 합성

김인섭, 김동한¹, 심광보¹, 이명웅, 이병하²

국립요업기술원
¹한양대학교 세라믹공정 연구센터
²명지대학교 무기재료공학과

Synthesis of Mullite from Kaolin and Industrial By-Products

ABSTRACT

Mullite was synthesized by adding industrial by-products, Al(OH)3 and boehmite, to a natural kaolin of pink A-grade. The attrition milling method, which has simultaneously milling and mixing effects, was carried out. The specimens were formed by uni-axial pressing of 1.5 ton/$textrm{cm}^2$ and then fired. When the Al(OH)3 was added, the flexural strength of 71.8 wt% Al2O3 specimen fired at 1600$^{circ}C$ for 4 hrs was 22.3 MPa and the amount of synthesized of 71.8 wt% Al2O3 specimen fired at 1600$^{circ}C$ for 10 hrs was about 85%. When the boehmite was added, the flexural strength of 68 wt% Al2O3 speciment fired at 1600$^{circ}C$ for 10 hrs was 147 MPa, and the high purity mullite of about 95% was synthesized for 71.8 wt% Al2O3 specimen fired at 1600$^{circ}C$ for 10 hrs.

Key words: Mullite, Kaolin, By-products, Mullite content