| SHI Sheng,ZHAO Yuhang,WANG Zixun,LIU Leichun,CHEN Wenqi,SUN Jingli,CHEN Yi,YUAN Yong.Effect of Carbonyl Iron Antioxidant Modification on Radar Stealth Wave-absorbing Properties[J],54(10):266-274 |
| Effect of Carbonyl Iron Antioxidant Modification on Radar Stealth Wave-absorbing Properties |
| Received:February 26, 2025 Revised:April 14, 2025 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.10.022 |
| KeyWord:carbonyl iron TEOS oxidation resistance radar stealth wave absorption |
| Author | Institution |
| SHI Sheng |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| ZHAO Yuhang |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| WANG Zixun |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| LIU Leichun |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| CHEN Wenqi |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| SUN Jingli |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| CHEN Yi |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| YUAN Yong |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
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| 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. |
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