Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Characteristic Changes of the Hydrated Sodium Silicate Depending on Heat Treatment Temperature

수화된 규산소다의 열처리 온도에 따른 물성변화

  • Kong, Yang-Pyo (Department of Materials Science and Engineering, Chungnam National University) ;
  • Cho, Ho-Yeon (Department of Materials Science and Engineering, Chungnam National University) ;
  • Suhr, Dong-Soo (Department of Materials Science and Engineering, Chungnam National University)
  • Published : 2008.03.31
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Abstract

In order to fabricate porous ceramics, hydrated sodium silicate was synthesized by hydrothermal reaction using anhydrous sodium silicate. The microstructural and the structural characteristics of the expanded ceramics were observed depending on heat treatment temperature (550, 600, 650, $700^{\circ}C$) and then the effect of these characteristics on the compressive strength and the temperature gradient was investigated. As the heat treatment temperature was increased, the compressive strength was decreased from $0.717KN/cm^2\;(550^{\circ}C)\;to\;0.166KN/cm^2\;(700^{\circ}C)$. The temperature gradient was increased with increasing the experimental temperature regardless of the heat treatment temperature. The temperature gradient of the expanded ceramics which was heat treated at $650^{\circ}C\;was\;300^{\circ}C$. The bulk specific gravity, porosity, pore size, pore characteristics and wall thickness were varied depending on heat treatment temperature, and the compressive strength and the temperature gradient were governed by the complex effects of these factors.

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