Gas permeability and mechanical properties of porous alumina ceramics with unidirectionally aligned pores |
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| Affiliation: | 1. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan;2. Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimo-Shidami, Moriyama-Ku, Nagoya 463-8560, Japan;1. Anadolu University, Department of Materials Science and Engineering, Iki Eylul Campus, 26480 Eski?ehir, Turkey;2. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, 01277 Dresden, Germany;3. Sabanc? University, Material Science and Programme, 34956 ?stanbul, Turkey;1. Institute of Inorganic Chemistry, Slovak Academy of Science, Dúbravská cesta 9, 842 36 Bratislava, Slovakia;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Ko?ice, Slovakia;3. Institute of Medical Biology and Clinical Genetics, Faculty of Medecine, Comenius University, Sasinkova 4, Bratislava, Slovakia;4. Associated Tissue Bank of Faculty of Medecine of P.J. ?afárik University and L. Pasteur Faculty Hospital, Triedna SNP 1, Ko?ice, Slovakia;1. Anadolu University, Department of Materials Science and Engineering, Iki Eylul Campus, 26480 Eskisehir, Turkey;2. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, 01277 Dresden, Germany;3. Sabanci University, Material Science and Engineering Programme, 34956 Istanbul, Turkey |
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| Abstract: | Porous alumina ceramics having unidirectionally aligned cylindrical pores were prepared by extrusion method and compared with porous ceramics having randomly distributed pores prepared by conventional method, and their gas permeability and mechanical properties were investigated. SEM micrographs of the porous alumina ceramics prepared by the extrusion method using nylon fibers as the pore former showed excellent orientation of cylindrical pores. The bending strength and Weibull modulus of the extruded porous alumina ceramics with 39% porosity were 156 MPa and 17, respectively. These mechanical properties of extruded samples were higher than those of the conventional porous alumina ceramics. The strength decreased from 156 to 106 MPa with increasing pore size from 8.5 to 38 μm. The gas permeability of the extrusion samples is higher than that of the conventional samples and increased with increasing of porosity and pore size. |
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