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以FeCl_3·6H_2O(AR)、FeSO_4·7H_2O(AR)、NH_3·H_2O(AR)为原料,采用水热法制备得到纳米Fe_3O_4,采用X射线衍射仪、扫描电镜和矢量网络分析仪对其相组成、形貌与电磁性能进行了表征,将纳米四氧化三铁掺入到水泥基材料中制备水泥基吸波材料,采用弓形法测试水泥基吸波材料在8~18 GHz频段内的吸波性能。结果表明:纳米四氧化三铁的平均尺寸在80~90 nm之间;电损耗角正切tanδe和磁损耗角正切tanδm分别在0.03~0.29和0.01~0.41之间;当其掺量为10%,试样厚度为30 mm时,水泥基复合吸波材料在8~18 GHz频段范围内的吸波性能最佳,反射率小于-10 d B的频带宽为4.7 GHz。
Fe_3O_4 was prepared by hydrothermal method using FeCl_3 · 6H_2O (AR), FeSO_4 · 7H_2O (AR) and NH_3 · H_2O (AR) as raw materials. The phase composition of the nano-Fe_3O_4 was characterized by XRD, SEM and vector network analyzer , Morphology and electromagnetic properties were characterized. The nano-Fe3O4 was incorporated into the cement-based materials to prepare cement-based microwave absorbing materials. The bow-shaped method was used to test the microwave absorbing properties of the cement-based microwave absorbing materials in the frequency range of 8-18 GHz . The results show that the average size of nano-sized Fe3O4 is between 80 and 90 nm, the electrical loss tangent tan δe and the magnetic loss tangent tan δm are between 0.03 and 0.29 and 0.01 to 0.41, respectively. When the content is 10% When the specimen thickness is 30 mm, the cement-based composite absorbing material has the best absorbing performance in the frequency range of 8-18 GHz, and the reflectivity of less than -10 d B is 4.7 GHz.