A new precursor to lightweight porous Si–Al–O–B ceramics with enhanced microwave transmissivity |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai, 264209, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China;3. School of Materials Science and Engineering, Shandong University of Technology, Zibo, 255049, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China;3. School of Science, Lanzhou University of Technology, Lanzhou 730050, China;4. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China;5. Shandong Industrial Ceramics Research & Design Institute Co., Ltd., Zibo 255000, PR China;1. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai, 264209, PR China;2. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;3. School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK;4. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;5. Department of Mechanical Engineering, Shandong University of Technology, Zibo, China;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;2. School of Materials, Sun Yat-sen University, Guangzhou 510275, China;3. Advance Interdisciplinary Technology Research Center, Academy of Military Science, Beijing 100010, China;4. Beijing Institute of Special Electromechanical Technology, Beijing 100012, China |
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| Abstract: | Nowadays, complicated preparation processes and harsh sintering conditions wave transparent ceramics limit its further development. To solve this problem, we explore a promising precursor by adopting a polymerization-pyrolysis method to prepare porous Si–Al–O–B ceramics at a mild sintering condition (1000 °C). The porous Si–Al–O–B ceramics exhibits enhanced wave transparency at 10–16 GHz with a low dielectric constant (<3), a low loss angle tangent value (<0.01), and simultaneously, a relative high flexible strength of 82 MPa. According to the results of the XRD and FTIR analysis, porous Al4B2O9 crystallization dispersed in the amorphous SiO2 matrix constructs the main phases of the products. The changes of Al and B elements are confirmed to have an effect on the phase compositions and micro structure of the composite ceramics, which obviously affect the mechanical and dielectric properties of the derived ceramics. The as-prepared porous Si–Al–O–B ceramics could be a potential candidate for next generation electronic window materials due to its low dielectric constant and loss angle tangent value, as well as high flexible strength. |
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| Keywords: | Ceramic Dielectric property Mechanical property |
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