Molecular design for thermally stable SiZrBOC structure from single source precursor with high ceramic yield |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100080, China;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China;2. School of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, China;1. Department of Aerospace and Aircraft Engineering, Kingston University, London, SW15 3DW, UK;2. Chemical Engineering in the School of Engineering at Newcastle University, UK;3. Queen Mary University of London, UK;4. Department of Materials Science, Southwest Jiaotong University, China;5. Dept of Materials, Imperial College, London, SW7 2AZ, UK;1. Fraunhofer Institute for Interfacial Engineering and Biotechnology IGB, 70569, Stuttgart, Germany;2. Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, 30167, Hannover, Germany |
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| Abstract: | A new type of high-temperature-resistant SiZrBOC ceramics was prepared by sol-gel method using polymethyl-hydro siloxane (PMHS), boric acid (B(OH)3), and n-propyl zirconate (Zr(OPr)4) as raw materials. After high-temperature pyrolysis, the SiZrBOC precursor was transformed into a crystalline ceramic material with a yield of 89.5 wt%. Fourier infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) were applied to characterize the polymer-ceramic conversion process and thermal behavior of ceramic precursors. According to the results, the addition of boron elements led to the formation of Si-O-B links in the system. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to study the phase composition and microstructure of SiZrBOC ceramics. Finally, the oxidation test at 1200 °C revealed that SiZrBOC ceramics with a boron/zirconium molar ratio of 2.5:1 exhibited the best oxidation resistance at a weight gain of 0.4 wt% only. |
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| Keywords: | Polymer-derived ceramics (PDCs) SiZrBOC ceramics Oxidation behavior Thermal stability Sol-gel method |
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