石浩,高瞻,杨文飞,樊伟杰,宋立英,孙强,褚贵文.脲醛树脂包覆对片状羰基铁粉电磁吸波性能的影响[J].表面技术,2024,53(4):175-183.
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].Surface Technology,2024,53(4):175-183 |
| 脲醛树脂包覆对片状羰基铁粉电磁吸波性能的影响 |
| Effect of Urea Formaldehyde Resin Coating on Electromagnetic Wave Absorption Properties of Flake Carbonyl Iron Powder |
| 投稿时间：2022-11-25 修订日期：2023-05-05 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.04.016 |
| 中文关键词: 微波吸收 片状羰基铁粉 脲醛树脂 阻抗匹配 电磁衰减 反射损耗 |
| 英文关键词:microwave absorption flake carbonyl iron powder urea formaldehyde resin Impedance matching electromagnetic attenuation reflection loss |
| 基金项目:国家自然科学基金资助项目(52101392、41976044);山东省自然科学基金面上项目(ZR2021ME087) |
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| Author | Institution |
| SHI Hao | Shandong University of Science and Technology, Shandong Qingdao 266590, China |
| GAO Zhan | Shandong University of Science and Technology, Shandong Qingdao 266590, China;Naval Aviation University Qingdao Campus, Shandong Qingdao 266041, China |
| YANG Wenfei | Naval Aviation University Qingdao Campus, Shandong Qingdao 266041, China |
| FAN Weijie | Naval Aviation University Qingdao Campus, Shandong Qingdao 266041, China |
| SONG Liying | Shandong University of Science and Technology, Shandong Qingdao 266590, China |
| SUN qiang | Shandong University of Science and Technology, Shandong Qingdao 266590, China |
| CHU Guiwen | Shandong University of Science and Technology, Shandong Qingdao 266590, China |
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| 中文摘要: |
| 目的 提高片状羰基铁粉(FCI)的吸波性能。方法 采用原位聚合法制备脲醛树脂(UF)包覆片状羰基铁粉核壳复合粒子。通过透射电子显微镜(TEM)和X射线衍射仪(XRD)分别对试验前后样品的微观形貌和物相组分进行表征。采用矢量网络分析仪对处理前后片状羰基铁粉在0.5~18 GHz频率范围内的电磁参数进行测试，基于传输线理论对其反射损耗曲线进行拟合分析。结果 微观形貌及X射线衍射谱结果表明，成功合成了脲醛树脂包覆片状羰基铁粉复合粒子(FCI@UF)。对测得的电磁参数进行分析，与原始片状羰基铁粉相比，包覆后铁粉介电常数和磁导率的实部、虚部均呈下降趋势，电磁波衰减能力减弱，与空气的阻抗匹配能力增强。反射损耗曲线图中，包覆后铁粉能有效吸收频带变宽(以反射损耗小于‒10 dB的带宽作为有效吸收频带)，由3.15 GHz变为4.38 GHz，在 13.84 GHz时有最小反射损耗(‒20.64 dB)，最小反射损耗向高频移动，最小值降低率达41.38%。结论 使用脲醛树脂对片状羰基铁粉进行包覆，制备了综合吸波性能更具优势的FCI@UF复合粒子，有效提高了片状羰基铁粉的吸波性能。 |
| 英文摘要: |
| 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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