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铁基金属微粉广泛地用作吸波材料。用机械合金化的方法制备了Fe85Si9.6Al5.4和(Fe0.65Co0.35)85Si9.6Al5.4(质量分数,%)合金微粉。研究了球磨20和80h的微粉形貌,分析了微粉不同球磨时间的显微结构,测试了微粉在0.5～18GHz频段内的复数介电常数和复数磁导率,并计算了微波反射率。结果表明,球磨后微粉的粒径小于5μm,FeSiAl合金中硅和铝原子溶于铁原子的点阵中,同时,在FeCoSiAl合金中有FeSi和AlCo金属间化合物产生。在频率为8GHz附近,复数介电常数和复数磁导率匹配较好,此时FeCoSiAl合金微粉的最小反射率达到-13.7dB。
Iron-based metal powders are widely used as absorbing materials. Fe85Si9.6Al5.4 and (Fe0.65Co0.35) 85Si9.6Al5.4 (mass fraction,%) alloy powders were prepared by mechanical alloying. The morphology of the powders was investigated at 20 and 80 h. The microstructures of the powders at different milling times were analyzed. The complex permittivity and complex permeability of the powders at 0.5 ~ 18 GHz were tested. The microwave reflectivity was also calculated. The results show that the particle size of the powders is less than 5μm after milling, and the silicon and aluminum atoms in the FeSiAl alloy are dissolved in the lattice of iron atoms. Meanwhile, FeSi and AlCo intermetallic compounds are formed in the FeCoSiAl alloy. In the vicinity of 8 GHz, the complex permittivity and complex permeability match well, and the minimum reflectance of FeCoSiAl alloy powder reaches -13.7 dB at this time.