碳纳米管/金属Ni/稀土氧化物复合材料用于增强夹层结构的吸波性能

CNTs/Ni/REO COMPOSITES USED TO ENHANCE THE WAVE-ABSORBING PROPERTY OF SANDWICH STRUCTURE

将碳纳米管、纳米氧化镧、微米金属Ni粉、微米氧化镱分散至环氧树脂,将该环氧树脂混合物填充复合材料夹层结构的夹层,来探究该复合材料结构的吸波性能。利用网络矢量分析仪对该结构进行检测。结果表明,该复合材料结构在吸波分贝和吸波带宽方面都有提升,具有良好的吸波性能。在2.99～18.00GHz频段内,反射分贝出现三次波峰：第一个波峰的吸波带宽（〈-5d B）为2.55GHz,最大值出现在4.86GHz,为-23.78d B。第二个波峰的吸波带宽（〈-5d B）为3.75GHz,最大值出现在10.35GHz,为-21.07d B。第三个波峰吸波带宽（〈-5d B）为5.66GHz,最大值出现在14.04GHz,为-13.65d B。整体的吸波带宽（〈-5d B）达到11.96GHz,占全部测试频率的80%。另外,该复合材料结构对电磁波的损耗比例也有提升。

Study the wave-absorbing property of sandwich structures by dispersing the carbon nanotubes, lanthanum oxide in nanometer scale, Ni powder in micrometer scale and ytterbium oxide in micrometer scale into epoxy and filling the interlayer of glass fiber reinforced composites sandwich structures with the above epoxy mixture. The wave-absorbing property was characterized by using vector network analyzer. The results show that these composites structures have a good performance in wave-absorbing. The reflection ratio（dB） and the wave-absorbing bandwidth are both improved. From 2. 99 to 18.00GHz, there are three wave-absorbing peaks. The bandwidth （〈-5dB） of the first peak is 2.55GHz, the maximum dB is -23.78dB, and it is located at 4. 86GHz. The bandwidth （〈-5dB） of the second peak is 3.75GHz, the maximum dB is -21.07dB, and it is located at 10. 35GHz. The bandwidth （〈-5dB） of the third peak is 5.66GHz, the maximum dB is -13.65dB, and it is located at 14.04GHz. The total wave-absorbing bandwidth （〈-5 dB） reach 11.96 GHz, and it accounts for 80% of all the tested frequency. Besides, the wave loss ratio of the composites structures is improved as well.