用高能球磨法制备了掺杂SiO2的FeCo纳米晶磁粉, 用SEM、XRD等分析手段对纳米晶磁粉进行结构分析, 研究了掺杂SiO2对FeCo纳米晶磁粉/石蜡复合物复介电常数和复磁导率的影响. 结果表明, 杂质SiO2主要以非晶态的形式存在于FeCo纳米晶颗粒中; 与未掺杂SiO2的FeCo纳米晶磁粉相比, 在复磁导率变化很小的情况下, 掺杂适量的SiO2可显著降低纳米晶磁粉/石蜡复合物的复介电常数, 可较好的解决吸波涂层设计中的阻抗匹配问题.
The FeCo/SiO2 nanocrystalline magnetic powders were prepared from the mixtures of carboxyl iron, cobalt and SiO2 powders by the simple ball-milling method. The microstructure was characterized by XRD and SEM. Doping effect on electromagnetic parameters was investigated by vector network analyzer for FeCo nanocrystalline magnetic powders doped with SiO2. The results show that impurity of SiO2 in the FeCo nanocrystalline exists in the form of amorphous phase and the doping can greatly modify the microwave lectromagnetic properties of the magnetic powders. As compared to the pure FeCo nanocrystalline powders, doping of SiO2 significantly decreases the real and imaginary parts of complex permittivity of magnetic powders, but corresponding complex permeability changes slightly.
Consequently, it is obvious that this is an availability way to improve the impedance matching of absorbers.
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