Preparation and properties of hierarchical structural alumina/mullite composites |
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| Affiliation: | 1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, PR China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, PR China;3. Materials Research Institute and Department of Materials Science & Engineering, The Pennsylvania State University, University Park, PA 16802, USA;1. Department of Research and Development, SHOFU INC., Higashiyama-ku, Kyoto, Japan;2. Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;3. Department of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;4. Ceramic Physics Laboratory, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan;1. Univ. Limoges, IRCER, UMR CNRS 7315, F-87068 Limoges, France;2. CILAS, F-45063 Orléans, France;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, PR China;2. Stake Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China;1. Ceramic Research Centre of Saga University, 2441–1 Oono-otsu, Arita-cho, Nishimatsuura-gun, Saga 844–0013, Japan;2. Faculty of Art and Regional Design, Saga University, 1 Honjo-cho, Saga 840–8502, Japan;3. Saga Ceramics Research Laboratory, 3037–7 Hei Kuromuta Arita-Cho, Nishimatsuura-gun, Saga 844–0022, Japan;4. Centre of Advanced Instrumental Analysis, Kyushu University, Fukuoka 816–8580, Japan |
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| Abstract: | Hierarchical structural alumina/mullite composites constructed by alumina platelets inter-locked porous matrices and mullite whiskers secondary structures had been designed and prepared based on the fluorine-catalyzed gas-phase process. In the composites, mullite whiskers grew on the alumina platelets of the matrices to form cactus-like structures, before that, topaz rods as transitional secondary structures formed at lower temperature. The fluorine-etching effects on secondary structures’ nucleation were discussed. The alumina/mullite composites (1300 °C) had low bulk density (1.10 g/cm3), high porosity (71.4%), and proper compression strength (～14.2 MPa), meanwhile, the average filtration efficiencies of PM2.5 and PM10 during the filtration tests were 78% and 76%, respectively. The introduced mullite whiskers with length of ～1 µm had not induced obvious changes on the structural parameters, hence, the alumina/mullite composites (1300 °C) possessed similar particle filtration performances compared with the alumina porous matrices, and both of the two species materials could be applied for hot gas filtration. |
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| Keywords: | Alumina platelets Mullite whiskers Cactus-like structure Hot gas filtration |
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