3D printed crack-free SiOC(Fe) structures with pyrolysis-induced carbon nanowires for enhanced wave absorption performance |
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| Affiliation: | 1. Additive Manufacturing Institute, Shenzhen University, Shenzhen, 518060, China;2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China;3. Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robotics, Shenzhen University, Shenzhen, 518060, China;1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, PR China;2. Beijing Mechanical Equipment Institute, Beijing 100039, PR China;3. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No.29 Jiangjun Ave., Nanjing 211106, PR China;4. School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, PR China;2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China;3. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structure, Beijing, 100081, China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China;1. School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China;2. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China;3. Hengdian Group DMEGC Magnetics Co., LTD, Jinhua, 322118, China;4. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China;5. Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea |
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| Abstract: | High-performance SiOC(Fe) wave-absorbing ceramics, containing a large number of carbon nanowires, were successfully prepared using a combination of photopolymerization 3D printing technology and the polymer-derived ceramic pyrolysis method. By employing an optimized segmented slow heating scheme with extended holding time, the pyrolysis of SiOC(Fe) ceramics at 1000 °C facilitated the growth of carbon nanowires, Fe3C and SiO2 grains. These carbon nanowires were interlaced and interconnected within the samples, forming abundant conductive networks. This highly conducive network efficiently converted electromagnetic energy into thermal energy, effectively dissipating electromagnetic waves, and consequently enhancing the microwave absorption performance of ceramics. Moreover, this approach not only reduced ceramic cracks but also improved the dielectric loss performance of the materials, achieving a minimum reflectivity value of ?35.72 dB. The SiOC(Fe) ceramics added with 5 wt% VcFe effectively enhanced the magnetic loss of the material, reduced the difference between the relative complex permeability (μr) and the relative complex dielectric constant (εr), and improved the impedance matching between the material surface and air, thereby further improving its microwave absorption performance. This resulted in an increase in the maximum effective absorption bandwidth of the material to 12.7 GHz at 5 mm. This study offers a promising solution for the preparation of ceramic matrix composite materials incorporating carbon nanowires, magnetic particles and ceramic precursors, which would be potentially valuable for radar detection and sensor applications. |
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| Keywords: | SiOC(Fe) ceramics Photopolymerization 3D printing Carbon nanowires Wave-absorbing properties |
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