Effect of sintering temperature on functional properties of alumina membranes |
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| Affiliation: | 1. Faculty of Chemical Engineering, Urmia University of Technology, Urmia, Iran;2. Institute on Membrane Technology of the Italian National Research Council (CNR-ITM), via P. Bucci cubo 17/C, 87036 Rende (CS), Italy;1. IFP Energies Nouvelles, Rond-point de l’échangeur de Solaize 69360 Solaize, France;2. Univ Lyon, INSA-LYON, MATEIS, UMR CNRS 5510, F69621 Villeurbanne, France;1. State Key Laboratory of Separation Membranes and Membrane Processes, Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;2. School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China;3. Department of Chemical Engineering, Curtin University, Perth, WA 6102, Australia;1. Department of Chemical Engineering, Imperial College, London SW7 2AZ, United Kingdom;2. Faculdade de Engenharia Química, Universidade Federal de Uberlandia, Av. João Naves de Ávila 2160, Uberlandia, MG, Brazil;1. Chemistry and Chemical Engineering Research Center of Iran;2. Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran;1. Department of Energy Engineering, College of Engineering, Hanyang University, Seoul 04793, Republic of Korea;2. C1 Gas Separation & Conversion Research Center, Carbon Resources Institute, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea;3. Membrane Research Center, Advanced Materials Division, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea |
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| Abstract: | Supported membranes were prepared from different submicron alumina powders. The evolution of pore size, hardness and permeability were monitored after sintering the films at temperatures ranging from 1000 to 1400 °C. These functional properties and the microstructure of the films were compared with the free-standing membranes. Sintering at temperature range from 1000 to 1200 °C maintained the narrow, monomodal pore size distribution of the supported membranes. The effect of sintering temperature on the hardness of the membranes was weak. The permeability was also independent on the sintering temperature. When sintering temperature was raised up to 1300 and 1400 °C, the pore size increased significantly and distribution was changed to bimodal containing fraction of large pores. The hardness of the membranes increased while significant densification was not observed. Permeability increased due to the large pore size and the high porosity. In sintering of the free-standing membranes pore size remained almost unchanged, density increased when sintering temperature was raised, hardness was dependent on the density and permeability decreased continuously. The substrate did not have effect on the grain growth, which was dependent on the sintering temperature. Evolution of the properties of the free-standing membranes suggests local densification. The rigid substrate restricts the sintering shrinkage leading to densification of small areas. This local densification opens large flow channels between agglomerates. This increases the pore size, broadens the pore size distribution and increases the permeability. The macroscopic densification of the film is small. |
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