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J. Korean Ceram. Soc. > Volume 45(12); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(12): 845.
doi: https://doi.org/10.4191/kcers.2008.45.1.845
열수반응으로 합성된 수화규산소다의 팽창 특성
조호연, 공양표1, 서동수
충남대학교 재료공학과
1한국건자재시험연구원
Expansion Characteristics of the Hydrated Sodium Silicate which Synthesized by Hydrothermal Reaction
Ho-Yeon Cho, Yang-Pyo Kong1, Dong-Soo Suhr
Department of Materials Science and Engineering, Chungnam National University
1Korea Institute of Construction Materials
ABSTRACT
Hydrated sodium silicate was synthesized by hydrothermal reaction using anhydrous sodium silicate. The optimum additions of water was 25wt% to make hydrated sodium silicate with homogeneous and purposed water contents. Porous ceramics with homogeneous microstructure and spherical closed pore can be fabricated by elimination of the large pores(a few mm in size) which was formed during first heat treatment through the decomposition of water. Spherical closed pore was formed above $600^{circ}C$ and the pore size was increased with increasing second heat treatment temperature due to growth of pores. The size of spherical closed pore was varied from 35 to $233;{mu}m$ and specific gravity was varied from 0.2 to 1.02 depending on the combinations of the first and second heat treatment temperature.
Key words: Hydrothermal reaction, Anhydrous sodium silicate, Hydrated sodium silicate, Closed pore, Porous ceramics
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