Fabrication of transparent MgAl2O4 spinel via spray freeze drying of microfluidized slurry |
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| Affiliation: | 1. Engineering Ceramics Research Group, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 51508, Republic of Korea;2. Agency for Defence Development, 488 Bugyuseongdaero, Yuseong, Daejeon 34186, Republic of Korea;1. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;2. Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, 240-8501, Japan;3. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;1. Engineering Ceramics Department, Korea Institute of Materials Science 797 Changwondaero, Changwon, Gyeongnam, 641-831, Republic of Korea;2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, Hubei, 430062, China;1. Kanagawa Academy of Science and Technology, KSP, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan;2. Yokohama National University, 79-7, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan;3. Nagaoka University of Technology, 1603-1 Kamitomioka Nagaoka, Niigata 940-2188, Japan |
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| Abstract: | Spherical granules were prepared from a monodispersed slurry by combining the microfluidization (MF) method and the spray freeze-drying (SFD) process. Starting with the prepared granules, transparent MgAl2O4 ceramics were fabricated through pressureless sintering followed by hot isostatic pressing. A comparison with a polydispersed slurry prepared by the ball-milling method showed successful fabrication of a mono-dispersed state by microfluidization method, and 80% visible in-line transmittance was obtained at a 600-nm wavelength from a process starting with a monodispersed slurry of low solid content. Microstructural analysis of the green bodies, the pre-sintered bodies, and the hot isostatic pressed bodies of the prepared MgAl2O4 ceramics revealed that the slurry dispersion should be controlled to a high level in order to suppress scattering sources such as pores and microcracks, which affect the in-line transmittance of visible light. |
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| Keywords: | Transparent Spray freeze drying Freeze granulation Microfluidization |
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