Preparation and Characteristics of <TEX>$gamma-LiAlO_2$</TEX> Fibers by the Sol-Gel Method

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J. Korean Ceram. Soc. > Volume 32(2); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(2): 197.

졸-겔 법에 의한 $gamma-LiAlO_2$ 화이버의 제조 및 특성

현상훈, 홍성안¹, 신현철

연세대학교 세라믹공학과
¹KIST 화공연구부

Preparation and Characteristics of $gamma-LiAlO_2$ Fibers by the Sol-Gel Method

ABSTRACT

${gamma}$-LiAlO2 fibers for fiber reinforced molten carbonate fuel cell (MCFC) matrix have been produced from LiAlO2 complex polymeric sols using the sol-gel process. The stable and spinnable LiAlO2 sols could be synthesized by mixing LiNO3 alcohol solutions in aluminum complex polymeric sols prepared through the condensationpolymerization reaction of 1 more of aluminum tri-sec-butoxide with 0.55 mole of mixed chelates (mole ratio of acetylaceton/triethanolamine=0.25/0.3). It was found that the viscosity range for fiber-spinning should be higher than 30 poise. The defect-free flexible ${gamma}$-LiAlO2 fibers with the average tensile strength of 350 MPa could be obtained when the spinned fibers were heat-treated to 120$0^{circ}C$ on the specified heating schedule after dried at room temperature.

Key words: $\gamma-LiAlO_2$ fibers, Complex polymeric sols, MCFC, Sol-gel method