【摘要】 利用氧化石墨层间可吸附大量离子的特性使金属Fe³⁺吸附到氧化石墨层间,再通过H₂还原制备了不同还原温度下的纳米Fe/石墨复合材料。采用元素分析、TEM、XRD、磁滞回线及电磁参数测定等手段系统考察了还原温度对纳米Fe/石墨复合材料的分子组成、晶体结构、磁学性能及微波吸收性能的影响。结果表明:纳米Fe/石墨复合材料的密度约2.4g/cm³;纳米Fe/石墨复合材料属于典型的软磁性材料;FeGO300、FeGO600和FeGO900的最大反射损耗量分别为-6.2dB、-8.9dB和-3.2dB。当厚度为1mm时,FeGO600的反射损耗大于-6dB的频段范围为11～18GHz,而FeGO600和FeGO900的最大反射损耗仍低于-6dB,因此FeGO600的微波吸波效果最好,600℃为制备纳米Fe/石墨复合吸波材料的最佳还原温度。更多还原

【Abstract】 In this work Fe/graphite nanocomposite is prepared by the absorption of Fe³⁺ into layers of graph- ite oxide and then the reduction of Fe³⁺/graphite oxide compound at different reduction temperatures by H₂.The in- fluecnce of reduction temperatures on the composition,crystal structure,magnetic and microwave absorption properties of Fe/graphite nanocomposite is investigated by elemental analysis,TEM,XRD,magnetic hysteresis curve and elec- tromagnetic parameter analysis.The results show that the special gravities of the samples are about 2.4 g/cm³ and they are soft magnetic materials.The maximum theoretical reflection losses of FeGO300,FeGO600 and FeGO900 are- 6dB,-8.9 dB and -3.2dB,respectively.When the thickness is 1mm,the frequency region in which the maximum reflection losses of FeGO600 is more than -6.2dB is 11～18GHz,and the maximum theoretical reflection losses of FeGO300 and FeGO900 are still less than -6dB.In conclusion,the microwave absorption property of FeGO600 is the best,and the optimum reduction temperature for preparing Fe/graphite nanocomposite is 600℃.更多还原