Fe-based pigment was modified with silane coupling agent(KH550), which was used as filler to prepare radar-infrared compatible stealth coatings. The influence of surface modification on microwave-absorbing properties and infrared emissivity was systematically investigated. The results indicate that Fe-based alloy powders were modified with silane coupling agent successfully. Compared to that of Fe-based alloy powders without modification, the low infrared emissivity of composite coatings treated with 2% coupling agent changes slightly. However, the value of permittivity decreases visibly, impedance matching is enhanced. The coatings with thickness of 2mm give microwave absorption -10dB with a band width of 2. 2GHz and the value of maximum absorption peak is improved.%用KH550硅烷偶联剂对铁基合金粉包覆改性,并以其为颜填料制备了雷达/红外兼容隐身单涂层,系统研究了包覆改性对涂层低红外发射率以及雷达吸波性能的影响.研究结果表明,偶联剂以化学键的形式吸附在铁基合金粉表面形成有机薄膜.2%偶联剂包覆对涂层的红外发射率影响较小,但显著降低铁基合金粉的介电常数,提高阻抗匹配度.涂层厚度为2mm时,-10dB的吸收带宽从包覆前1.5GHz增加至2.2GHz,吸收峰强度也有明显增加.
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