铁基非晶合金带材压磁现象测试与表征方法改进及其压磁特性

Improvement of the Piezomagnetic Measurement and Characterization Method of Fe-based Amorphous Alloys Ribbons and Its Piezomagnetic Properties

摘要:

本文在无接触式电感方法基础上自主开发改进了一套新的测试系统,改进的测量装置可以表征铁基非晶合金带材的压磁特性。研究表明,在σ≤0.1 MPa下,Fe_73.5Cu₁Nb₃Si_13.5B₉非晶带材具有良好的圧磁特性,在测试条件lev=0.3V 、f=1 kHz时,Fe_73.5Cu₁Nb₃Si_13.5B₉非晶带材均在多次试验中均表现出很好的稳定性和重复性。带材对微小应力极为敏感,在对带材进行初步施压时,样品的电感值出现迅速上升趋势,通过放大实验进一步精确了带材的应力敏感区间约在0-1.5 KPa之间；不同厚度和宽度的Fe_73.5Cu₁Nb₃Si_13.5B₉非晶带材对其压磁性能具有较大影响,测量的电感初值及其相应的SI(%)Max值总体上随着相应尺寸的增加而增大；带材宽度一定时,33-36 mm厚带材的压磁性能最优, 相应的SI(%)Max为19.8%；带材厚度一定时,20 mm宽的带材具有更加优异的压磁性能,其SI(%)Max高至22.02%。

Abstract:

A new improved test system was developed based on the non-contact inductance method, which can be used to characterize the piezomagnetic properties of Fe-based amorphous alloy ribbon properly. The studies show that when the test frequency is 1 kHz, the voltage is 0.3 V and the compressive stress σ is no more than 0.1 MPa, the amorphous magnetic material of Fe_73.5Cu₁Nb₃Si_13.5B₉ has excellent piezomagnetic properties, and its ribbons of different specifications have exhibited perfect stability and repeatability after many times experiments. It"s excited that the ribbons are extremely sensitive to tiny stress, and they show a rapidly large rising trend of the inductance once the initial pressure was applied on the ribbons. Moreover, the further amplifying experiment indicated that the sensitivity range is about 0-1.5 KPa; In addition, the size of Fe_73.5Cu₁Nb₃Si_13.5B₉ ribbons can make a big influence on its piezomagnetic property, the initial inductance and its corresponding SI (%) Max value of the ribbons increase substantially along with the sample size increasing; with the same width, the piezomagnetic property is superior to others while the thickness is 33-36 mm, the maximum value of SI (%) is 19.8%. Accordingly, with the same thickness, the ribbons with a width of 20 mm show a more excellent piezomagnetic property and the SI (%) Max has reached to 22.02%.