Properties and Synthesis of Mullite Precursor using an Economic Condensed Ethyl Silicate (CES) or Partially Hydrolyzed TEOS

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J. Korean Ceram. Soc. > Volume 33(6); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(6): 679.

부분가수분해된 TEOS 및 중축합 에틸실리케이트(CES)로부터 합성된 Mullite 전구체 분말 특성 비교

서신석, 이신영, 이범재¹, 김동표¹, 노재성

충남대학교 공과대학 정밀공업화학과
¹충남대학교 공과대학 정밀공업화학

Properties and Synthesis of Mullite Precursor using an Economic Condensed Ethyl Silicate (CES) or Partially Hydrolyzed TEOS

ABSTRACT

The economic precursor of mullite (3Al2O3.2SiO2) was prepared by sol-gel method from condensed ethyl silicate (CES) or partially hydrolyzed TEOS and aluminum isopropoxide as sources of SiO2 and Al2O3 respecti-vely. The CES was synthesized from SiCl4 and C2H5OH including 7.0wt% of H2O In this study mullite from the CES was formed at 100$0^{circ}C$ even without long hydrolysis step while mullite from partially hydrolyzed TEOS was obtained at 120$0^{circ}C$. The mullite produced from the CES was spherical shape of fine powder which was in range of 0.05~0.1${mu}{textrm}{m}$ in size. The specific surface area of dried gel was about 290m2/g and rapidly reduced above 80$0^{circ}C$. In addition the dried gel and the mullite powder were investigated by XRD. FT-IR EDS and ICP

Key words: Sol-gel method, Condensed ethylsilicate, TEOS, Mullite precusor, Partially hydrolysized TEOS