磁退火处理对玻璃包覆钴基非晶合金复合微丝磁电性能的影响

Magnetic and Electric Properties of Glass-Coated Co-Beased Amorphous Alloy Microwires with Field Annealing

通过玻璃包覆法连续制备出尺寸可控的玻璃包覆的钴基非晶合金微丝。研究了不同退火条件(普通热退火、横向磁场退火和纵向磁场退火)对合金微丝微观结构和磁性能及导电率的影响。采用X射线衍射分析(XRD)、扫描电子显微镜(SEM)测试分析微丝中的相变化,采用振动样品磁强计(VSM)测试微丝的磁性能。发现不同退火条件对非晶基体中析出纳米晶相的成分、尺寸和沿轴向的分布有显著影响,进而对非晶合金丝的磁、电性能产生重大影响。其中,轴向磁场退火可获得最佳的磁性能和电性能,其饱和磁化强度比淬态提高225%,初始磁导率提高214%,导电率提高26%。对比磁退火处理后性能最佳的薄带,该微丝饱和磁化强度提高110%,初始磁导率提高79%,导电率提高45%。

Modified Taylor-Ulitovsky process was developed for continuous fabrication of glass-coated Co-based amorphous alloy microwires with controlled size. Effects of different annealing processes（ conventional thermal annealing,horizontal and longitudinal field annealing） on microstructures and magnetic and electric properties of the microwires were investigated. Phase transformations of the wires were evaluated by X-ray diffraction（ XRD） and scanning electron microscope（ SEM） measurements,while magnetic properties were tested by vibration sample magnetometer（ VSM）. The results suggested that precipitated phases depended on the annealing process significantly,leading to distinct changes in their electric and magnetic properties. Particularly,excellent soft magnetic properties with much enhanced saturation and initial permeability and high conductivity could be achieved by longitudinal magnetic field annealing. Compared with as-spun samples,the saturation magnetization increased by 225%,the initial permeability increased by214%,and the electrical conductivity increased by 26%. In addition,the saturation magnetization,the initial permeability and the electrical conductivity of the longitudinal field-annealed microwires increased by 110%,79%,45%,respectively,compared with the best ribbons with the same composition and annealed at the same condition.