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J. Korean Ceram. Soc. > Volume 38(10); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(10): 876.
Change of Phase Transformation Temperature at Fabricated Membrane using Sol-gel Method
Hun Cheong, Duck-Kyun Choi, Deock-Soo Cheong1
Department of Inorganic Material Engineering, Hanyang University
1Multifunctional Ceramics Research Center, Korea Institute of Science and Technology
ABSTRACT
The supported and unsupported boehmite ($gamma$-AlOOH) membranes were prepared using a boehmite sol. The supported membrane was consisted of a porcelain support, two intermediate $alpha-{Al_2}{O_3}$ layers, and a top boehmite membrane. XRD patterns showed that the supported top membrane had a higher $theta-$ to $alpha-{Al_2}{O_3}$ transformation temperature compared to the unsupported membrane. This result was also confirmed from microstructural study of the membrane. The shift in the phase transformation temperature should be explained by difference of a stress generated in the supported top membrane due to interaction between the support layers and the top membrane.
Key words: Phase transformation, Microstructure, Boehmite membrane, Sintering, Porcelain support
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