Abstract:

In order to prepare a flexible foldable microwave absorbing composite textile, this paper selects three-dimensional orthogonal fabric as the substrate and polyurethane as the binder to compound carbon black onto the substrate. The microscopic morphology, structure, flexibility and microwave absorbing properties of the composites are analyzed, through scanning electron microscopy, Fourier transform infrared spectroscopy, stiffness tester, vector network analyzer and arched frame connection,. The results show that when the mass fraction of carbon black in the impregnation solution is 15%, and the bending height of the composites is 10cm, the composite exhibits good flexibility; the effective absorption bandwidth (EAB) of the material can cover the entire X band when the test angle is 0°. A minimum reflection loss (RL_min) of -41.33 dB is obtained at 10.64 GHz when the test angle is 30°. This suggests that adding a proper amount of carbon black can effectively improve the microwave absorbing properties of the composites.

Key words: microwave absorbing material, 3D fabric, carbon black, impregnation, flexible, microwave absorbing properties

摘要：

选用三维正交织物作为基布,以聚氨酯为黏合剂将炭黑复合在基布上制备柔性可折叠吸波纺织复合材料。通过扫描电子显微镜、傅立叶红外光谱、硬挺度仪、矢量网络分析仪与拱形框连接对复合材料的微观形貌、结构、柔性和吸波性能进行分析。结果表明:当浸渍溶液中炭黑质量分数为15%,复合材料的弯曲高度为10cm,显示出良好的柔韧性;测试角度为0°时,材料的有效吸波频宽(EAB)可覆盖整个X波段;测试角度为30°时,在10.64 GHz得到了最小反射损耗(RL_min)-41.33 dB,显示添加适量的炭黑,可以有效提高复合材料的吸波性能。

关键词: 吸波材料, 三维织物, 炭黑, 浸渍, 柔性, 吸波性能