实验以熔融纺丝法制备的玻璃包覆Fe_(79-x)Co_xSi_8B_(13)非晶合金微丝为对象,分析了微丝成分、尺寸以及玻璃包覆层去除对微丝静磁性能的影响.研究结果表明,玻璃包覆Fe为Fe_(79-x)Co_xSi_8B_(13)非晶合金微丝存在明显的磁各向异性,微丝轴向为易磁化方向;随着Co含量的增加,微丝的饱和磁化强度先增大后减小,Co含量为10%的Fe_(69)Co_(10)Si_8B_(13)非晶合金微丝饱和磁化强度最高,为1323emu·cm-3;对于玻璃包覆Fe_(69)Co_(10)Si_8B_(13)非晶合金微丝,当芯丝半径与玻璃包覆层厚度比值k约小于0.5时,其轴向磁滞回线为近矩形,表现出大巴克豪森效应;微丝的轴向剩磁比随k值的增大而减小,而微丝径向剩磁比保持很小,仅0.03左右;微丝的轴向和径向矫顽力均随比值k的增大而减小;当芯丝半径为10.91μm、玻璃包覆层厚度为9.7μm(K为1.12)时,去除包覆层后微丝的轴向矫顽力降低30%、径向矫顽力降低11%;而轴向剩磁比降低33%、径向剩磁比降低67%.
The influences of alloy composition, geometrical characteristics and glass coating on the mag-netic properties of the glass -coated amorphous Fe_(79-x)Co_xSi_8B_(13) microwires are investigated. The results show that the glass-coated amorphous Fe_(79-x)Co_xSi_8B_(13) microwires exhibit obvious magnetic anisotropy and the direction of easy magnetization is the axial direction. With cobalt content increasing, the satura-tion magnetization of the glass-coated amorphous Fe_(79-x)Co_xSi_8B_(13) microwires increases firstly and then decreases. When the cobalt content is 10% , the saturation magnetization of the microwire achieves maxi-mum value, being 1323emu · cm~(-3) . As the glass -coated amorphous Fe_(69)Co_(10)Si_8B_(13) microwire, when the ratio k of metal core radius and glass coating thickness is less than 0. 5, the axial hysteresis loop of the microwire is rectangular and appears large Barkhausen effect. With the k increasing, the axial rema-nence ratio of the microwire decreases, but the radial remanence ratio keeps very small (about 0.03).Both the axial and radial coercivities of the microwires decrease with k increasing. After removing the glass coating, the axial and radial coercivities of the microwire with the initial glass coating thickness of 9.7μm and metal core radius of 10. 9μm decrease 30% and 11% , respectively. Meanwhile, the axial and radial remanence ratios decrease 33% and 67% , respectively.
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