碳纤维/羰基铁粉复合涂层吸波效果及机理分析

在碳纤维表面化学镀镍,再将其与羰基铁粉混合制备成吸波涂层,对其吸波性能进行了测试.结果表明:在2～18 GHz内,碳纤维/羰基铁粉吸波涂层,最大吸收峰在5.92 GHz,此时反射率为-8.89 dB,反射率小于-5.00 dB的频宽为9.50 GHz;单层羰基铁粉涂层在相同厚度下,最大吸收峰为7.94 GHz,对应的反射率为-10.36 dB,反射率小于-5.00 dB的频宽为6.90 GHz;碳纤维与羰基铁粉混合后,涂层反射率小于-5.00 dB的频宽增大,有利于吸收雷达波.最后,对碳纤维/羰基铁粉吸波涂层的吸波机理进行了初步分析.

Study on Wave- Absorbing Effect and Mechanism of Carbon Fiber/Carbonyl Iron Powder Composite Coating

Carbon fiber was plated with electroless nickel and then mixed with carbonyl iron to generate wave-absorbing composite coating. The wave-absorbing performance and mechanism of the resulting composite coating were investigated and compared with that of the coating made of carbonyl iron powder alone. The results indicated that the maximum absorbing peak of the Ni-coated carbon fiber/carbonyl iron composite coating was located at -8.89 dB at 5.92 GHz. The corresponding reflection rate was -8.89 dB, and the working band corresponding to a reflection less than -5.00 dB was 9.50 dB. At the same time, the coating made of the carbonyl iron powder alone with the same thickness had a maximum absorbance of -10.36 dB at 7.94 GHz. The corresponding reflection rate for this coating was -10.36 dB, and the working band with respect to a reflection less than -5.00 dB was 6.90 GHz. It was therefore supposed that the carbon fiber/carbonyl iron composite coating of a broader absorbing working band could be suitable to absorbing radar wave.