直径对玻璃包覆非晶合金微丝磁性的影响

采用Taylor-Ulitovsky方法制备了直径分别在6.3～28.0μm、20.2～28.0μm和14.0～35.2μm之间的玻璃包覆非晶态FeCuNbVSiB、FeBSiCMn和CoNiFeSiB微丝。通过X射线衍射、扫描电镜、振动样品磁强计分别测试了玻璃包覆微丝的组织结构、微观形貌和磁性，研究了不同成分玻璃包覆磁性合金微丝的玻璃包覆层厚度、合金芯直径对微丝磁性能的影响。结果表明了，玻璃包覆磁性合金微丝的磁性能的影响因素由大到小依次为：饱和磁致伸缩系数、微丝成分和微丝尺寸。轴向磁化时随着微丝直径及玻璃包覆层厚度的增大，3 种微丝的径向饱和场强度降低，FeCuNbVSiB和FeBSiCMn微丝的轴向矫顽力先分别由508 A/m和390 A/m降低到486 A/m和278 A/m后再升高到2570 A/m和342 A/m，CoNiFeSiB微丝的轴向矫顽力由171 A/m降低到63 A/m。

Effect of diameters on the magnetic properties of glass-coated amorphous alloy microwires

The glass-coated amorphous FeCuNbVSiB，FeBSiCMn and CoNiFeSiB microwires with diameters 6.3～28.2μm，20.2～28.0μm and 14.0～35.2μm were synthesized by the Tayor-Ulitovsky method，respectively. The microstructure，morphology and magnetic properties of the microwires samples were studied by X-ray diffractometry (XRD)，scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). The effects of different glass coating thicknesses and metal core diameters on the magnetic parameters of microwires samples were analyzed. The results show that the sequence influencing factors on the magnetic properties are the saturation magnetostriction coefficient，the composition and the dimension of the microwires in turn. With the increase of the microwires core diameter and glass coating thickness，the radial saturation fields of all the samples continually decrease，the coercive force of the Co-rich microwires decreases from 171 A/m to 63 A/m，but the coercive force of the FeCuNbVSiB and FeBSiCMn microwires decreases from 508 A/m and 390 A/m to 486 A/m and 278 A/m，then increases to 2570 A/m and 342 A/m，respectively.