Low Temperature Preparation of Transparent Glass-Ceramic Using Metal-Alkoxides (1) Synthesis and Properties of Porous Monolithic Gel in Li2O·1.7Al2O3·8.6SiO2

금속 알콕시드를 이용한 투명 결정화유리의 저온 합성 (1) Li2O·1.7Al2O3·8.6SiO2 다공성 겔체의 합성

  • Chun, Kyung-Soo (Department of Chemistry, Kyungwon University) ;
  • Tak, Joong-Jae (Department of Interior Ceramic Design, Yeo Joo Institute of Technology)
  • 전경수 (경원대학교 화학과) ;
  • 탁중재 (여주대학 인테리어 세라믹 디자인학과)
  • Received : 2007.06.20
  • Accepted : 2007.09.11
  • Published : 2007.12.10

Abstract

Crack-free dried gel monoliths of the composition $Li_2O1{\cdot}7Al_2O_3{\cdot}8.6SiO_2$ have been prepared as a precursor of transparent glass-ceramic by the hydrolysis and polycondensation of mixed metal alkoxides in solutions containing N,N-dimethylformamide as the drying control chemical additive, alcohols, and water. It was investigated that activation energy for gelation according to the variation of water concentration ranged from 13 to 14 kcal/mol. Only when the amount of water for gelation was 3 times higher than the stoichiometric amount, monolithic dry gels were successfully prepared after drying at $70{\sim}75^{\circ}C$ and at a rate of 0.1~0.3%/h. The specific surface area, the pore volume, the average pore diameters of dried gel at $180^{\circ}C$ were about $239.40m^2/g$, 0.001~0.03 mL/g, and $145.62{\AA}$, respectively. It showed that the dried monolithic gel had a porous body. The DTA curve had the first exothermic peak around $800^{\circ}C$ and the 2nd peak around $980^{\circ}C$, which may correspond to crystallization of the gel.

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