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将纳米铁粉均匀混合在聚丙烯腈中进行预氧化和碳化处理,制备出碳包覆纳米铁氮化合物复合材料。用XRD、SEM、TEM、强磁计和矢量网络分析仪等对不同碳化条件下复合材料的相结构、组织形貌、磁性能和电磁参数进行表征,研究了碳化温度对吸波性能的影响。结果表明,当碳化温度为700℃时Fe的剩余量最少,Fe3N的相对含量大于Fe4N并且有少量的Fe3O4;当碳化温度为750℃时Fe3N相对含量较少,Fe和Fe4N的相对含量占优,Fe3O4被还原;当碳化温度升高到800℃时,产物的主要物相是Fe和Fe3C,少量Fe3N,几乎没有Fe4N。涂层厚度为1.5 mm的样品小于-10 d B的频宽达到4.5 GHz,在15GHz处反射损耗最小(为-13 d B)。
The nano-iron powder is uniformly mixed in polyacrylonitrile for pre-oxidation and carbonization to prepare a carbon-coated nano-iron-nitrogen compound composite material. The phase structure, morphology, magnetic properties and electromagnetic parameters of the composites under different carbonation conditions were characterized by XRD, SEM, TEM, ferrometer and vector network analyzer. The effects of carbonation temperature on the microwave absorbing properties were studied. The results show that when the carbonization temperature is 700 ℃, the residual amount of Fe is the least, the relative content of Fe3N is larger than that of Fe4N and the amount of Fe3O4 is small. When the carbonization temperature is 750 ℃, the relative content of Fe3N is less and the relative content of Fe and Fe4N is dominant, Fe3O4 is reduced; when the carbonization temperature is raised to 800 ℃, the main phase of the product is Fe and Fe3C, a small amount of Fe3N, almost no Fe4N. Samples with a coating thickness of 1.5 mm have a bandwidth of less than -10 d B up to 4.5 GHz and a minimum reflection loss of -13 d B at 15 GHz.