【摘要】 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。更多还原

【Abstract】 Fe-based metallic powder is widely used for microwave absorber.Fe85Si9.6Al5.4(wt%) and(Fe0.65Co0.35) 85Si9.6Al5.4(wt%) powders were prepared by mechanical alloying.Morphology of powders milled for 20 and 80 h were studied.Microstructure of powders milled for various time were analyzed.The complex permittivity and complex permeability of powders in the frequency range from 0.5 to 18 GHz for 80 h milling were tested,and their reflectivity were calculated.The results show that the particle size of as-milled powders is less than 5 μm.Si and Al atoms are dissolved into the lattice of Fe atoms in FeSiAl powders.Simultaneously FeSi and AlCo intermetallic compounds are formed in FeCoSiAl powders.The complex permittivity and complex permeability are matched better at the frequency of about 8 GHz and the minimum value of reflectivity is-13.7 dB of FeCoSiAl powders.更多还原