磁性聚膦腈纳米管碳化材料的微波吸收性能研究

Microwave absorbing property of magnetic polyphosphazene nanotubes carbonized at high temperature

在惰性气氛下对磁性聚膦腈纳米管进行高温碳化，制备了新型的电磁损耗型碳基复合吸波材料。在磁场中检验了磁性聚膦腈纳米管碳化材料的磁响应性，通过四探针法测量了其电阻率，采用同轴传输反射法测定了电磁参数，并研究了该复合材料的微波吸收性能。研究结果表明，合成的磁性聚膦腈纳米管碳化材料在磁场中沿磁场方向作规则的定向排列，具有很好的磁响应性；电阻率为7．88（Ω·cm），是一种半导体材料；在测试频率范围2～18GHZ内，磁性聚膦腈纳米管碳化材料同时存在一定的介电损耗和磁损耗，是一种磁损耗型和介电损耗型相结合的复合吸波材料；在14GHz附近存在最大反射损耗-14dB，并且显示了一定的宽频吸收特性。

Novel microwave absorbing carbon based composites were prepared by carbonizing magnetic polypho- sphazene nanotubes at high temperature in an inert atmosphere. The magnetic responsivity was studied in the magnetic field and the resistivity was measured by four probe method. The electromagnetic parameters were measured by using coaxial transmission and reflection way and the microwave absorbing properties were stud ied. The results showed that the composites oriented in the magnetic direction, exhibiting good magnetic re- sponsivity. The composites are semiconductors with resistivity of 7.88 （Ω· cm）. In the frequency range of 2- 18GHz, there are both dielectric loss and magnetic loss. The maximum reflection loss was --14dB at 14GHz and the composites showed certain wide-frequency properties.