| SHI Hao,GAO Zhan,YANG Wenfei,FAN Weijie,SONG Liying,SUN qiang,CHU Guiwen.Effect of Urea Formaldehyde Resin Coating on Electromagnetic Wave Absorption Properties of Flake Carbonyl Iron Powder[J],53(4):175-183 |
| Effect of Urea Formaldehyde Resin Coating on Electromagnetic Wave Absorption Properties of Flake Carbonyl Iron Powder |
| Received:November 25, 2022 Revised:May 05, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.04.016 |
| KeyWord:microwave absorption flake carbonyl iron powder urea formaldehyde resin Impedance matching electromagnetic attenuation reflection loss |
| Author | Institution |
| SHI Hao |
Shandong University of Science and Technology, Shandong Qingdao , China |
| GAO Zhan |
Shandong University of Science and Technology, Shandong Qingdao , China;Naval Aviation University Qingdao Campus, Shandong Qingdao , China |
| YANG Wenfei |
Naval Aviation University Qingdao Campus, Shandong Qingdao , China |
| FAN Weijie |
Naval Aviation University Qingdao Campus, Shandong Qingdao , China |
| SONG Liying |
Shandong University of Science and Technology, Shandong Qingdao , China |
| SUN qiang |
Shandong University of Science and Technology, Shandong Qingdao , China |
| CHU Guiwen |
Shandong University of Science and Technology, Shandong Qingdao , China |
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| Abstract: |
| Flaky carbonyl iron powder (FCI) is a common electromagnetic wave absorbing material, but its resistivity is small, its impedance matching with free space is poor, and wave absorbing performance is not ideal. In order to improve the wave absorbing performance of the flaky carbonyl iron powders, in this paper, urea formaldehyde resin (UF) synthesized by reaction of urea and formaldehyde was used as the wall material, and the flaky carbonyl iron powder was used as the core material. Urea formaldehyde resin coated core shell composite particles (FCI@UF) were prepared by in-situ polymerization. A transmission electron microscope (TEM) and an X-ray diffractometer (XRD) were used to characterize the micro morphology and phase composition of the samples before and after the experiment. A Vector network analyzer was used to test the electromagnetic parameters of the flaky carbonyl iron powder before and after treatment in the frequency range of 0.5-18 GHz. Finally, the reflection loss (RL) curve was fitted and analyzed based on the transmission line theory. TEM photos showed that there was a layer of nano film at the edge of FCI obtained after UF treatment. The EDS electronic image and the related element distribution map showed that C, N, O and Fe elements were evenly distributed on the surface of composite particles. Combined with the microscopic morphology and EDS energy spectrum results, it was concluded that this experiment successfully synthesized FCI@UF core shell composite particles. In addition, the characteristic diffraction peaks of FCI and UF appeared in the X-ray diffraction spectra of the treated composite particles, further evidenced successful preparation of FCI@UF composite particles; The electromagnetic parameters measured by the vector network analyzer in the frequency range of 0.5-18 GHz were analyzed. Compared with original FCI, the real and imaginary parts of the coated iron powder dielectric constant and the real and imaginary parts of the magnetic permeability showed a downward trend. The tangent value of the loss angle could represent the electromagnetic wave loss capacity of the absorbing material. The tangent value of FCI@UF composite material loss angle also decreased, indicating that the attenuation ability of electromagnetic wave was weakened. But through analysis, the impedance matching ability of FCI@UF composite material with air was enhanced, so it was impossible to directly determine the strength of electromagnetic wave absorbed by the material. The reflection loss simulation calculation was conducted according to the measured electromagnetic parameters. The wave absorption performance of the absorbing material could be directly observed by using the reflection loss curve. In the reflection loss curve, the effective absorption band of coated iron powder became wider (the band with the reflection loss less than –10 dB was taken as the effective absorption band), changing from 3.15 GHz to 4.38 GHz, at 13.84 GHz, the minimum reflection loss was ‒20.64 dB, and the minimum reflection loss moved to high frequency, with a minimum reduction rate of 41.38%. In a word, this paper uses urea formaldehyde resin to coat the flaky carbonyl iron powders, and prepares the FCI@UF composite material, effectively improving the microwave absorbing performance of the FCI composite material. |
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