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摘要
采用硅烷偶联剂、钛酸酯偶联剂、正硅酸乙酯、磷酸分别对自制片状羰基铁粉进行包覆处理,在0.1～16GHz范围内,研究了不同包覆方法对片状羰基铁粉电磁参数和吸波性能的影响。结果表明:表面包覆形成的绝缘层降低了铁粉的电导率,减小了颗粒间导电网络形成的概率,降低了介电常数而磁导率基本不变,有效地改善了片状羰基铁粉的匹配性能。磷化处理由于在铁粉表面形成了致密的绝缘层,电磁参数调控效果最优,当吸波厚度为3mm,填充量为70%时,反射损耗曲线吸收峰位在2.3GHz,反射率-40.9dB,-10dB带宽为1.4GHz,具有良好的低频吸波性能。
Abstract
Homemade flake carbonyl iron powder was coated with silane coupling agent,titanate coupling agent,ethyl orthosilicate and phosphoric acid,respectively.The effects of different coating methods on the electromagnetic parameters and absorbing properties of the iron powder were studied in the range of 0.1～16GHz.The results shown that the insulation layer formed by surface coating reduced the conductivity of the iron powder,the probability of the formation of conductive network between particles,and the dielectric constant but the permeability basically remained unchanged,which effectively improved the matching performance of the iron powder.The electromagnetic parameters regulation of phosphorization was best due to the formation of dense insulating layer on the surface of the iron powder.When the absorption thickness was 3 mm and the filling amount was 70%,the absorption peak of the reflection loss curve was 2.3GHz,the reflectance was -40.9dB,and the bandwidth of -10dB was 1.4GHz,which exhibited excellent low frequency absorption performance.
关键词
羰基铁
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表面改性
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吸波性能
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反射率
Key words
carbonyl iron
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surface modification
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microwave absorption property
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reflectivity
表面包覆对片状羰基铁粉电磁吸波性能的影响[J].
化工新型材料, 2022, 50(5): 98-102 DOI:10.19817/j.cnki.issn1006-3536.2022.05.020
[1] 李泽,王建江,高海涛.P波段吸波材料研究进展[J].化工新型材料,2020,48(3):1-5.
[2] Cheng Y,Xu Y G,Cai J,et al.Effect of the bio-absorbent on the microwave absorption property of the flaky CIPs/rubber absorbers[J].Journal of Magnetism and Magnetic Materials,2015,389:106-112.
[3] Fadzidah Mohd Idris,Mansor Hashim,Zulkifly Abbas,et al.Recent developments of smart electromagnetic absorbers based polymer-composites at gigahertz frequencies[J].Journal of Magnetism and Magnetic Materials,2016,405:197-208.
[4] Zhao P F,Li L F,Luo Y Y,et al.Effect of blend ratio on the morphology and electromagnetic properties of nanoparticles incorporated natural rubber blends[J].Composites Part B,2016,99:216-223.
[5] Faez R,Martin I M,De Paoli M A,et al.Microwave properties of EPDM/PAni-DBSA blends[J].Synthetic Metals,2001,119:435-436.
[6] Al-Ghamdi Ahmed A,Al-Hartomy Omar A,Al-Solamy Falleh R,et al.Conductive carbon black/magnetite hybrid fillers in microwave absorbing composites based on natural rubber[J].Composites Part B,2016,96:231-241.
[7] Xu H B,Bie S W,Xu Y S,et al.Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces[J].Composites:Part A,2016,80:111-117.
[8] 周必成,王东红,贾琨,等.羰基铁吸波材料性能提升研究进展[J].科学技术与工程,2021,21(8):2928-2996.
[9] Xu H B,Bie S W,Xu Y S,et al.Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces[J].Composites:Part A,2016,80:111-117.
[10] Yan H H,Song X H.Study on wave absorption properties of carbonyl iron and SiO2 coated carbonyl iron particles[J].AIP Advances,2018,8(6):1-6.
[11] Wang L,Wen B,Yang H B,et al.Hierarchical nest-like structure of Co/Fe MOF derived CoFe@C composite as wide-bandwidth microwave absorber[J].Composites:Part A,2020,135:105958.
基金资助
河南省重点研发与推广专项项目(202102210240)
