Porosity features and gas permeability analysis of bi-modal porous alumina and mullite for filtration applications |
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| Affiliation: | 1. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan;2. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea;1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China;2. National Academy of Innovation Strategy, Beijing, 100038, China;3. School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China;1. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 642-831, Republic of Korea;2. University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 305-350, Republic of Korea;1. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shanxi 710072, PR China;2. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm 11418, Sweden;3. Sinosteel Luoyang Institute of Refractories Research Co., Ltd, Luoyang, Henan 471039, PR China;1. Laboratoire des Sciences de Matériaux et Environnement, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia;2. Université Paris-Est, ICMPE (UMR7182), CNRS, UPEC, Thiais 94320, France;3. CSIR-Central Glass and Ceramic Research Institute (CGCRI), 196, Raja S C Mullick Road, Kolkata 700032, India;1. Korea University of Science & Technology, Daejeon 305-350, South Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science, Changwon Gyeongnam 642-831, South Korea;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, University of Seoul, Seoul, 02504, Republic of Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, Republic of Korea |
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| Abstract: | Bimodal porous structures were prepared by combining conventional sacrificial template and partial sintering methods. These porous structures were analysed by comparing pore characteristics and gas permeation properties of alumina/mullite specimens sintered at different temperatures. The pore characteristics were investigated by SEM, mercury porosimetry, and capillary flow porosimetry. A bimodal pore structure was observed. One type of pore was induced by starch, which acted as a sacrificial template. The other pore type was due to partial sintering. The pores produced by starch were between 2 and 10 µm whereas those produced by partial sintering exhibited pore size of 0.1–0.5 µm. The effects of sintering temperature on porosity, gas permeability, and mullite phase formation were studied. The formation of the mullite phase was confirmed by XRD. Compressive strengths of 37.9 MPa and 12.4 MPa with porosities of 65.3% and 70% were achieved in alumina and mullite specimens sintered at 1600 °C. |
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| Keywords: | Alumina Mullite Permeability Porosity |
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