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J. Korean Ceram. Soc. > Volume 35(6); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(6): 575.
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한상목, 신대용, 강상규
강원대학교 공과대학 재료공학과
Preparation for Porous Ceramics Using Low Grade Clay
Sutiability of Jungsan clay shale dolomite sludge Anyang feldspar and alumina as raw materials for light-weight porous ceramics was examined. In order to find optimum manufacturing conditions compositions heating temperatuers and heating times were varied and their effects on physical properties were measured and bloating mechanism was investigated. Jungsan clay seems suitable as raw material to make the light-weight constructional materials with 5wt% of ANyang feldspar and alumina added in calcined clay (800$^{circ}C$) having bulk density of 0.45g/cm3 water absorption of 1.34% and compressive strength of 85kg/cm2 rapid-heated at 1200$^{circ}C$ for 30min. It is suggested that bloating mechanism depends on the difference of tem-peratures between the inside and outside in specimen the remained gases in interstices can bloat by the li-quid phase of surface with high viscosity and gas pressure at elevated temperature.
Key words: Porous ceramics, Bloating mechnism, Light-weight constructional materials
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