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J. Korean Ceram. Soc. > Volume 36(8); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(8): 829.
산화물 첨가에 의한 불투명화 실리카 에어로겔의 기계작 강도 및 열전도도
손봉희, 김계태1, 현상훈, 성대진2
연세대학교 세라믹공학과
1연세대학교 세리믹공학과
2한국표준과학연구원 온도그룹
Mechanical Strength and Thermal Conductivity of Silica Aerogels Opacified by Adding Oxides
ABSTRACT
The silica aerogels opacified via adding oxides were prepared by the sol-gel supercritical drying technique and their characteristics of mechanical strength and thermal conduction were investigated. The compressive strength of SiO2-10 mol% TiO2 and SiO2-10mol% Fe2O3 aerogels were 0.11 and 0.047 MP a respectively much higher than 0.025 MPa of pure silica aerogels. The thermal conductivity of silica aerogels opacified by TiO2 was as low as 0.02505 W/m$.$K at 400$^{circ}C$ It was found that the TiO2 -opacifier for improving mechanical strength and suppressing high temperature conduction of pure silica aerogels was more effective than the Fe2O3 -opacifier
Key words: Sol-gel supercritical drying, Opacified silica aerogel, TiO2-opacifier, Mechanical strength, Thermal con-ductivity
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