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J. Korean Ceram. Soc. > Volume 34(3); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(3): 303.
테이프캐스팅법에 의한 화이버 강화 $gamma-LiAlO_2$ 메트릭스의 제조
현상훈, 백계현, 홍성안1
연세대학교 세라믹 공학과
1KIST 화공연구부
Preparation of Fiber-Reinforced $gamma-LiAlO_2$ Matrixes by the Tape Casting Method
ABSTRACT
To enhance the strength and formability of MCFC matrixes, alumina/${gamma}$-LiAlO2 fiber-reinforced ${gamma}$-LiAlO2 ma-trixes have been investigated. The MCFC matrixes with the thickness of 500~600 ${mu}{textrm}{m}$ were prepared by tape-casting of the slurry containing 10~30wt% fibers, followed by heat-treating up to $650^{circ}C$. The porosity of fi-ber-reinforced matrixes decreased with the content of fibers, while the appropriate porosity(50~60%) for MCFC matrixes could be attained by adding larger ${gamma}$-LiAlO2 particles with the diameter of about 50${mu}{textrm}{m}$ up to 50 wt%. The optimum length and content of the alumina fiber, both in the alignment of fibers and the enhancement of the strength, were found to be below 250${mu}{textrm}{m}$ and 20 wt%, respectively. On the other hand, the strength(156 gf/$textrm{mm}^2$) of the ${gamma}$-LiAlO2 matrix reinforced with ${gamma}$-LiAlO2 fibers prepared in this study was improved by 20~40% in comparison with the alumina-fiber-reinforced matrix. It was also found that the alu-mina-fiber-reinforced matrix was completely corroded in molten carbonates but the ${gamma}$-LiAlO2 was not.
Key words: MCFC, $\gamma-LiAlO_2$, fiber, Fiber-reinforced matrix, Tape casting
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