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http://dx.doi.org/10.3740/MRSK.2002.12.3.205

Change of Phase Transformation and Microstructure of Alumina Membrane: I. Effect by Porosity of Support  

Cheong, Hun (Korea Institute of Ceramic Engineering and Technology, Pottery Research Center)
Hwang, Kwang-Taek (Korea Institute of Ceramic Engineering and Technology, Pottery Research Center)
Choi, Duck-Kyun (Department of Inorganic Materials Engineering, Hanyang University)
Cheong, Deock-Soo (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.12, no.3, 2002 , pp. 205-210 More about this Journal
Abstract
The HPS(High Porosity Support, 39.3%) and the LPS( Low Porosity Support, 18.7%) were fabricated to investigate the phase transformation and the chance of microstructure with porosity of alumina support. Alumina sol was made using aluminum tri-sec $butoxide(ATSB,\; Al(O-Bu)_3)$, the membrane on porous support with different porosity and the membrane without support were fabricated. The $\theta$-to ${\alpha}-A1_2O_3$ phase transformation in the membranes was investigated using thin film X-ray diffraction (XRD), and the change of microstructure was observed using scanning electron microscopy(SEM). XRD patterns showed that the membrane on LPS and HPS had 10$0^{\circ}C$, 5$0^{\circ}C$ higher $\theta$-to ${\alpha}-A1_2O_3$ transformation temperature compared to the unsupported membrane. A similar effect was also observed in microstructure of the membranes, theoritical temperature difference were 97$^{\circ}C$ and 44$^{\circ}C$ by Crapeyron equation.
Keywords
phase transformation; porosity; alumina membrane; ATSB; sol-Gel;
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