Effects of particle size on microstructure and mechanical strength of a fly ash based ceramic membrane |
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| Affiliation: | 1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China;2. Beijing Key Laboratory of Pollutant Monitoring and Control in Thermoelectric Production Process, North China Electric Power University, Beijing, 102206, China;1. University of Belgrade, Institute for Multidisciplinary Research, Center of Excellence for Green Technologies, Kneza Višeslava 1, 11030, Belgrade, Serbia;2. Biosense Institute, Center for Sensing Technologies, University of Novi Sad, Dr Zorana Đinđića 1, 21102, Novi Sad, Serbia;1. College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300350, China;2. Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin, 300350, China;3. School of Physics, Nankai University, Tianjin, 300350, China;4. School of Opto-electronic Information, University of Electronic Science and Technology, Chengdu, 610054, China;5. Engineering Research Center of Thin Film Optoelectronics Technology, Ministry of Education, Nankai University, Tianjin, 300350, China;1. School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang, 471023, China;2. Key Laboratory of Material Physics of Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou, 450052, China;1. College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China;2. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 410083, China;1. Department of Orthopedics, Guangdong Provincial People''s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, 510080, PR China;2. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, PR China;3. National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou, 510006, PR China |
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| Abstract: | Recycling fly ash for ceramic membrane fabrication not only reduces solid waste discharge, but also decreases the membrane cost. Now, fly ash is becoming a promising substitute material for ceramic membrane preparation. A significant difference between fly ashes from different plants is the particle size, which makes performances of fly ash membranes unpredictable. The novelty of this work is to clarify the effects of the particle size of fly ash on ceramic membranes, thereby giving practical suggestions on fly ash selection for ceramic membrane preparation. Ceramic membranes were fabricated with different sizes of fly ashes. Effects of particle size on porosity, pore size, microstructure, mechanical strength and gas permeability of the membrane were investigated. Results indicate that a broader particle size distribution of fly ash leads to a denser structure of membrane with a lower porosity. Pore size and gas permeability of membrane increase while bending strength decreases with the particle size increasing. Bending strength of a fly ash membrane is largely determined by large particles in the fly ash because the large particles lead to cracks in the membrane. This work provides experimental bases for developing high performance ceramic membranes from fly ash. |
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| Keywords: | Ceramic membrane Coal fly ash Particle size Gas permeability Mechanical strength |
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