稀土元素对磁损耗型CoFeZrRE合金微波特性的作用

Effect of Rare Earth Elements on Microwave Characteristics of CoFeZrRE Alloys with Higher Magnetic Loss

采用机械合金化工艺(MA)制备了在微波频段具有较高磁损耗的CoFeZrRE材料。在工艺条件对所合成材料性能影响的研究基础上,主要研究了材料组分中掺杂稀土元素对合成材料微波磁导率的影响。结果表明,稀土元素的掺入能有效调整材料的微波磁导率及其频响特性;加入适量的Tb,有利于获得高的微波磁导率和大的磁损耗。还用数值计算模拟方法得到了2～18GHz该材料的反射率曲线,结果表明该材料有可能应用于吸波材料的设计和制备中。

CoFeZrRe amorphous materials with higher ferromagnetic loss over microwave range were prepared by mechanical alloying (MA). The technical parameters on electromagnetic properties of the synthesized materials, the microwave complex permeability dependence of material on doping with different rare earth was investigated. The results show that effects of rare earth elements on the microwave permeability characteristics of the studied materials are obvious and better performance of alloys with higher permeability and high loss is obtained at a suitable Tb content. Furthermore, reflection coefficient of one-layer absorber (1 mm thick) was numerically simulated on basis of microwave reflection absorption theorem. It is shown that these novel materials could be used as microwave absorbers operating in GHz range.