Microwave absorption properties of SiCN ceramics doped with cobalt nanoparticles
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Microwave absorption properties of SiCN ceramics doped with cobalt nanoparticles Shan Wang1,2 · Xiao Lin1,2 · M. Zeeshan Ashfaq1,2 · Xinfeng Zhang1,2 · Cuncai Zhao1,2 · Mingming Sheng1,2 · Rongkun Yang1,2 · Yaran Pei1,2 · Hongyu Gong1,2 · Yujun Zhang1,2 Received: 31 October 2019 / Accepted: 14 January 2020 / Published online: 1 February 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Polymer-derived SiCN ceramics containing cobalt was prepared with SiCN ceramics as matrix and cobalt nanoparticles as doping phase. Phase composition, Raman analysis, electromagnetic parameters and microwave absorption properties of SiCN ceramics with different cobalt content pyrolyzed at 1100 ℃ and cobalt content of 2 wt% but different pyrolysis temperature were carried out. The microstructures and magnetic properties of SiCN ceramics with cobalt content of 2 wt% and pyrolysis temperature of 900 ℃ were analyzed. The results show that some cobalt particles can react with carbon to form magnetic Co3C particles, which is one of the reasons for the magnetism of the sample. The good dielectric property of SiCN ceramics matches the magnetic property, which makes the material have excellent microwave absorption property. When the cobalt content is 2 wt% and the pyrolysis temperature is 900 ℃, the sample has the best microwave absorption performance. The minimum RL reaches − 10.9 at about 15 GHz, and the effective absorption bandwidth (RL < − 10 dB) is 3.3 GHz with a thickness of 3 mm. When the thickness became 6 mm, the minimum RL of the sample can reach − 11.8 dB and the effective absorption bandwidth (RL < − 10 dB) is 4.2 GHz, showing the excellent microwave absorption performance of materials we obtained.
1 Introduction In the free space, the electric fields and magnetic fields in the same phase and perpendicular to each other emit concussion particle wave, namely electromagnetic waves or microwaves. The wavelength range of microwave is between 1 µm and 1 m, which is a part of electromagnetic spectrum [1]. In recent years, the rapid development of electronic communication equipment in civil and military fields created to much electromagnetic waves in the environment of human existence, which has been defined as a new type of pollution called electromagnetic wave pollution at present, not only * Hongyu Gong [email protected] * Yujun Zhang [email protected] 1
Key Laboratory for Liquid‑Solid Structural Evolution & Processing of Materials Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, People’s Republic of China
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for it interfere with electronic communication equipment, but also for its great harm to human health [2–6]. Numerous researches has been devoted to electromagnetic shielding materials. For example, Wen et al. [7] have studied the reduced graphene oxide, and found that it also has excellent electromagnetic interference shieldi
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