表面技术2025，Vol.54Issue(10)：266-274,9.DOI:10.16490/j.cnki.issn.1001-3660.2025.10.022
羰基铁抗氧化改性对雷达隐身吸波性能的影响
Effect of Carbonyl Iron Antioxidant Modification on Radar Stealth Wave-absorbing Properties
史胜 1赵雨航 1汪梓迅 1刘磊春 1陈文旗 1孙京丽 1陈一 1袁勇1
作者信息
- 1. 上海航天精密机械研究所,上海 201600
- 折叠
摘要
Abstract
This is a surface modification technology that uniformly coats a layer of inorganic oxide on the surface of flaky carbonyl iron(FCI)through the sol-gel method,improving its high-temperature oxidation resistance without reducing its electromagnetic and wave-absorbing properties.Due to its excellent magnetic loss performance,carbonyl iron is often used as a filler in radar stealth wave-absorbing materials.However,at 200℃,it easily reacts with oxygen and moisture in the air to form non-magnetic or weakly magnetic oxides,resulting in a significant decline in magnetic loss capacity and wave-absorbing properties.The work aims to study the effect of SiO2-coated modified carbonyl iron on its high-temperature oxidation resistance and wave-absorbing properties.
Four clean flasks were taken,and 368 mL of ethanol,92 mL of deionized water,5.3 mL of ammonia water and 2 g of flaky carbonyl iron were added to each flask.After ultrasonic dispersion for 15 minutes,different amounts(5,10,15 and 20 mL)of tetraethyl orthosilicate(TEOS)were dropped into the flasks respectively.At room temperature,the reaction solution was stirred uniformly for 30 minutes.Then,the carbonyl iron was adsorbed on the inner wall of the flask with a magnet,and the mixed reaction solution was filtered out.The product was washed three times with anhydrous ethanol and dried to obtain SiO2-coated carbonyl iron(denoted as FCI@SiO2).The elemental composition and microstructure of FCI before and after coating modification were characterized and analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectrometer and X-ray fluorescence spectrometer.The complex electromagnetic parameters of FCI before and after coating modification were characterized by vector network analyzer.The effect of TEOS addition amount on the electromagnetic properties and wave-absorbing properties of FCI was compared.The effect of SiO2 coating layer on the electromagnetic properties and stealth wave-absorbing properties of FCI at 200℃was also compared.
The results of electromagnetic parameter analysis showed that when the addition amount of TEOS was 10 mL,the electromagnetic performance of FCI was optimal.The analysis of electron microscope microstructure and infrared spectrum indicated that a uniform and dense SiO2 layer was successfully coated on the surface of FCI,with a thickness of 40-45 nm.The simulation results of reflection loss showed that the existence of the SiO2 coating layer could significantly improve the oxidation resistance and radar electromagnetic wave-absorbing effect of FCI at 200℃.The prepared absorbing material(with a mass fraction of FCI@SiO2 of 40%)had a minimum reflection loss(RL)of-10.4 dB(f=10.59 GHz),and within the frequency band of 6.3-14.6 GHz,it achieved radar stealth wave-absorbing properties with a reflection loss≤-5 dB.This is a technology for surface coating modification of carbonyl iron,which hinders its oxidation reaction with oxygen in the air by generating a SiO2 layer on its surface,avoids the loss of magnetism effect in a high-temperature environment of 200℃,and ensures the play of radar stealth wave absorption.关键词
羰基铁/TEOS/抗氧化性/雷达隐身吸波Key words
carbonyl iron/TEOS/oxidation resistance/radar stealth wave absorption分类
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史胜,赵雨航,汪梓迅,刘磊春,陈文旗,孙京丽,陈一,袁勇..羰基铁抗氧化改性对雷达隐身吸波性能的影响[J].表面技术,2025,54(10):266-274,9.
