| WANG Qing-lu,WANG Li,LI Yong,YANG Hui-jing,CAO Mao-sheng.Co-Fe Deposited SiC Microparticles and Its Microwave Absorbing Properties[J],49(2):68-74 |
| Co-Fe Deposited SiC Microparticles and Its Microwave Absorbing Properties |
| Received:July 29, 2019 Revised:February 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.02.008 |
| KeyWord:silicon carbide ferrocobalt co-deposition chemical plating microwave absorption dielectric properties magnetic properties |
| Author | Institution |
| WANG Qing-lu |
1.Tangshan Normal University, Tangshan , China |
| WANG Li |
1.Tangshan Normal University, Tangshan , China |
| LI Yong |
2.Inner Mongolia University of Science and Technology, Baotou , China |
| YANG Hui-jing |
1.Tangshan Normal University, Tangshan , China |
| CAO Mao-sheng |
3.Beijing Institute of Technology, Beijing , China |
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| Abstract: |
| The work aims to improve microwave absorption properties of silicon carbide microparticles. Through improved chemical plating method, ferrocobalt alloy was deposited on the surface of SiC microparticles with CoSO4 and FeSO4 as the main reactants and NaH2PO2 as reducing agent by combining mechanical agitation and ultrasonic dispersion at the plating temperature of 50 ℃. The crystal state, composition and morphology of the materials before and after plating were characterized by X-ray diffractometer (XRD), X-ray energy spectrometer (EDS) and scanning electron microscope (SEM). The electromagnetic properties of the materials were tested by vector network analyzer in the frequency range 2~18 GHz, and the microwave reflection loss was calculated. Ferrocobalt alloy was uniformly deposited on the surface of silicon carbide microparticles, which effectively improved the electromagnetic properties and microwave absorption of silicon carbide. There were two relaxation peaks of interfacial polarization (9.1 GHz) and defect polarization (13.8 GHz) in the permittivity imaginary part of silicon carbide, while two relaxation peaks of Co-Fe/SiC material were produced after the deposition: dielectric relaxation peak (11.7 GHz) and magnetic relaxation peak (12.6 GHz). The dielectric and magnetic loss of CoFe alloy to microwave signal effectively improved the absorption properties of the material. When the thickness of the absorbing layer was 2.4 mm, the absorption bandwidth with reflection loss 10 dB reached 3.8 GHz and 20 dB bandwidth could reach 1.5 GHz. When the absorbing layer thickness was 2.3 mm, the value of the maximum absorption peak was –43 dB at the frequency of 12.7 GHz. The deposition of ferrocobalt alloy on the surface of silicon carbide is an effective method to improve the microwave absorption performance of the material, and this material is an efficient broadband microwave absorbing material. |
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