采用机械球磨的方法扁平化处理气雾化Fe-Cr-Si-Al软磁合金(SMSS)粉末, 并以柠檬酸溶胶－凝胶法合成六角铁氧体Ba3Co2Fe24O41(Co2Z)粉末. 运用SEM、XRD表征粉末的表面形貌和晶体结构, 并测试不同质量比的片状SMSS磁粉与Co2Z粉末混合组分在2.0～8.2GHz范围的复介电常数和复磁导率. 结果表明, 随着Co2Z粉末质量分数的增加, 样品的复介电常数和复磁导率减小; 同时计算得到的反射系数曲线显示样品的匹配频率移向高频, 当SMSS磁粉与Co2Z粉末的质量比为4/1时, 样品具有最小的反射系数峰值.
The gas atomized Fe-Cr-Si-Al (SMSS) alloy powder was flattened by mechanical milling, and Ba3Co2Fe24O41(Co2Z) hexagonal ferrite powder was synthesized by a citrate sol-gel process, respectively. The products were characterized by SEM and XRD. Furthermore, the complex permittivity and complex permeability of SMSS /Co2Z composites with various mass ratios were measured within 2.0--8.2 GHz. The results show that the complex permittivity and complex permeability substantially decrease with the increase of Co2Z powder fraction in the composites. Meanwhile, the calculated reflection loss (RL) curve indicates that the matching frequency shifts to high value, and when the mass ratio of SMSS/Co2Z is 4/1, the sample possesses a minimum RL value.
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