Preparation and characterization of polymer-derived Zr/Si/C multiphase ceramics and microspheres with electromagnetic wave absorbing capabilities |
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| Affiliation: | 1. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006 Badajoz, Spain;2. Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain;3. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, Hunan 410073, PR China;2. Astronaut Research and Training Center of China, Beijing 100094, PR China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China;2. Key Laboratory of Material Physics of Ministry of Education, Zhengzhou University, School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan 450052, China;3. Henan Key Laboratory of aeronautical material and application technology, Zhengzhou University of Aeronautics, Zhengzhou, Henan 450046, China;4. Department of Materials and Engineering, University of Central Florida, Orlando, FL 32826, USA;1. State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Precursors for Zr/Si/C multiphase ceramics were synthesized by the reactions of dilithiozirconocene complex with dichlorodimethylsilane, methyltrichlorosilane and dichloromethylvinylsilane, respectively. The precursor-to-ceramic process of the precursor was investigated by TG-GC–MS and TG-FTIR analyses, confirming a complete transformation from organometallic polymers into ceramics below 800 °C. Annealing experiments of the derived ceramics at temperatures from 1000 °C to 2000 °C indicated the crystallization from ZrSiO4, ZrO2 to ZrC. Furthermore, micrometer-sized Zr/Si/C ceramic microspheres were successfully fabricated from the precursor at 1000 °C, showing surface morphology like wrinkled pea. According to the XRD, HRTEM and XPS analyses, such multiphase ceramic microspheres consist of ZrSiO4, ZrO2, and amorphous SiOxCy. Interestingly, the ceramic microspheres performed satisfactory electromagnetic wave absorbing capacity with the RLmax reaching ?34 dB, which could be potential candidates for electromagnetic micro-devices. |
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| Keywords: | Polymer-derived ceramics Zr/Si/C Microspheres Electromagnetic wave absorption |
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