摘要
将不同比例的羰基铁和羰基镍混合气体在磁场引导下加热分解、形成了铁含量分别为80、55、20(ω/%,质量分数,下同)的羰基铁镍纤维。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)研究了羰基铁镍纤维相组成和形貌特征。将羰基铁镍纤维混合于环氧树脂中,经强磁场取向后制成同轴样品,通过矢量网络分析仪研究了其在2～18 GHz范围内的微波磁性能。结果发现:羰基铁镍纤维的直径、长径比及形貌可通过磁场大小调节。对于直径为微米级的羰基铁镍纤维,其饱和磁化强度对微波磁性能的影响远大于直径及长径比的影响。当铁含量为20%纤维的直径减小到亚微米(0.8μm)时,由于忽略了趋肤效应以及高的长径比,使其微波磁性能急剧提高。
The different ratio of Fe（CO）5 to Ni（CO）4 vapor was thermally decomposed to form carbonyl FexNi100-x （x=20%, 55%, 80%） fibers introduced by magnetic field. The phase and microstructure were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The microwave permeability of carbonyl FexNi100-x fiber was investigated through a vector network analyzer. The coaxial sample with the fibers of 10vol% was mixed adequately, oriented in the direction of magnetic field with closed loops and then cured. The complex permeability of the sample was measured with transmission and reflection （T/R） coaxial method. The result shows that the chemical composition, diameter and aspect ratio of carbonyl FexNi100-x fibers can be adjusted by the ratio of Fe（CO）5 to Ni（CO）4 and the magnetic field. The complex permeability was influenced more greatly by Ms value than by the diameter and aspect ratio for carbonyl FexNi100-x fiber with micro diameter. When the diameter of Fe20Ni80 fiber is reduced to about 0.8 μm, the complex permeability is increased dramatically due to the ignoring skin effect and high aspect ratio.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A03期222-224,共3页
Rare Metal Materials and Engineering
基金
国防预研
关键词
铁镍纤维
磁场引导
显微结构
磁性能
微波
Fe-Ni fiber
magnetic-field-induced
microstructure
magnetic properties
microwave
