纳米晶Fe-Ni和Fe-Co粉的微波磁性能

Microwave Magnetic Properties of Nanocrystalline Fe-Ni and Fe-Co Powders

先利用溶胶凝胶自蔓延法制备铁镍和铁钴氧化物前驱体,通过对前驱体在氢气中进行热处理,制备得到还原Fe25Ni75、Fe50Ni50和Fe50Co50合金粉。通过SEM、XRD分别对合金粉进行了形貌和结构表征,测量了合金粉的静磁性能以及0.5~6 GHz的磁导率,并通过传输线理论计算了合金粉的微波吸收系数。结果表明:氢气还原后的Fe25Ni75、Fe50Ni50和Fe50Co50分别为单一Ni3Fe相、FeNi相和FeCo相,晶粒大小分别为53、66、36 nm,合金粉具有较高的比饱和磁化强度和磁导率,Fe50Ni50合金粉在2.5~6 GHz吸收系数低于-10 dB,具有优异的微波中低频段吸收性能。

Fe,Ni oxide and Fe,Co oxide precursors were firstly prepared by sol-gel auto-combustion method.Reduced Fe25Ni75,Fe50Ni50 and Fe50Co50 alloy powders were obtained by annealing in the H2.The morphology and microstructure of these powders were characterized by means of SEM and XRD.The static magnetic properties and the complex permeability spectra of these powders in the range 0.5~6 GHz were measured.And the microwave reflectivity was calculated according to transmission-line theory.The results show that,these...