配比及热处理气氛对纳米Fe/石墨复合材料微波吸收性能的影响

利用氧化石墨层间可吸附大量离子的特性使Fe3+吸附到氧化石墨层间,再通过还原法制备了纳米Fe/石墨复合材料.采用元素分析、电磁参数测定等手段系统考察了硝酸铁与氧化石墨的配比及热处理气氛对纳米Fe/石墨复合材料分子组成和微波吸收性能的影响.结果表明,纳米Fe/石墨复合材料属于典型的软磁性材料;FeGO31H600的最大反射损耗为-6dB,而FeGO21H600的最大反射损耗达到了-9dB,故FeGO21H600的微波吸收效果最好;当厚度为1mm时,FeGO21600反射损耗大于6dB的频段范围为14～18GHz,而FeGO21H600反射损耗大于6dB的频段范围为11～18GHz,比FeGO21600低且宽,故FeGO21H600的微波吸收效果比FeGO21600的好.

Influence of Ratio and Heat Treatment Atmosphere on the Microwave Absorption Properties of Fe/Graphite Nanocomposite

Fe/graphite nanocomposite is prepared by the absorption of Fe3+ into layers of graphite oxide and then the reduction of Fe3+/graphite oxide compound with H2. The composition, magnetic and microwave absorption properties of Fe/graphite nanocomposite are investigated by elemental analysis and electromagnetic parameter analysis. The results show that Fe/graphite nanocomposites are soft magnetic materials. The maximum theoretical reflection losses of FeGO31H600 is-6dB, and the maximum theoretical reflection losses of FeGO21H600 is-9dB. So the optimum ratio for preparing Fe/graphite nanocomposite is 2 : 1. When the thickness is 1turn, the frequency region in which the maximum reflection losses of FeGO21600 is more than --6dB is 14 ～ 18GHz, which FeGO21H600 11 18GHz which is lower and wider than that of FeGO21600. Therefore, the microwave absorption properties of FeGO21H600 is better than that of FeGO21600.