| Fe73.5Cu1Nb3Si13.5B9 nanocrystalline alloy strip is widely used in the inductance device for its high permeability, high saturation magnetic flux, low coercive force, low loss and good frequency characteristic.When the master alloy of Fe73.5Cu1Nb3Si13.5B9 is melted, Al is very easy into the alloy strip as impurity atoms, influence the soft magnetic properties of alloy strip.It is important to evaluate and research the influence of Al on the soft magnetic properties and piezomagnetic properties.This paper studies the influence of Al on forming properties of Fe73.5Cu1Nb3Si13.5B9 amorphous alloy strip,and prepare the Fe73.4Cu1Nb3Si13.5B9Al0.1 amorphous alloy strip with usefull value in the soft magnetic properties, studies on the microstructure of the strip.Then do crystallization heat treatment according to Fe73.4Cu1Nb3Si13.5B9Al0.1 amorphous alloy strip to get crystallization alloy strip,studied the soft magnetic properties and piezomagnetic properties in detail.Experiment results show that with the increase of Al content, the liquidity of Fe73.5Cu1Nb3Si13.5B9 master alloy decreased significantly. The experiments of preparation of strip show that when addition amount of Al in the master alloy is more than 0.2atom%, poor liquidity of master alloy and amorphous alloy strip can not completely formed. The soft magnetic properties with the practical value of the Al containing amorphous ribbon components for Fe73.4Cu1Nb3Si13.5B9Al0.1.After crystallization heat treatment at 525 ℃for one hour, both the Fe73.5Cu1Nb3Si13.5B9 and Fe73.4Cu1Nb3Si13.5B9Al0.1 alloy appear diffraction peaks at 45 degree of 2θ,but the diffraction peak of Fe73.4Cu1Nb3Si13.5B9Al0.1 offset compare with Fe73.5Cu1Nb3Si13.5B9,there was lattice distortion of products of crystallization. The first crystallization peak temperature and the second crystallization peak temperature of Fe73.5Cu1Nb3Si13.5B9 alloy are 521 and 696 while the values of ℃ ℃Fe73.4Cu1Nb3Si13.5B9Al0.1 alloy are 543.07 ℃and 686℃. The EPM analysis results showed that in the Fe73.4Cu1Nb3Si13.5B9Al0.1 alloy, Al enrichs in grains of α-Fe and clusters which rich in Cu, combined with the results of XRD, it is likely to form Fe3 Al.Trace amount Al promoted the grain of Fe73.4Cu1Nb3Si13.5B9Al0.1 amorphous alloy grows when it being crystallization heat treatment, reduce the stress anisotropy in amorphous alloys to the value of μe above 100 KHz of the frequencies of the nanocrystalline after crystallization heat treatment, at the same time also significantly decreased the crystallization temperature to get the best soft magnetic properties;The crystallization process to get the best soft magnetic properties of Fe73.5Cu1Nb3Si13.5B9 alloy is 550℃×1hour while The crystallization process to get the best soft magnetic properties of Fe73.4Cu1Nb3Si13.5B9Al0.1 alloy is 540℃ × 1hour.Compared to the Fe73.5Cu1Nb3Si13.5B9 alloy,the best soft magnetic properties of Fe73.4Cu1Nb3Si13.5B9Al0.1 alloy was significantly decreased.The initial permeability of μi, maximum permeability of μm, saturation induction density Bs, coercivity Hc and hysteresis loss Pu of Fe73.5Cu1Nb3Si13.5B9 magnetic core are 113.7×103、838.4×103、1.3T 、 0.476A/m 、 2.664J/m3 while the corresponding values of Fe73.4Cu1Nb3Si13.5B9Al0.1 are 15.36×103、273.8×103、1.0T、1.055A/m、6.06J/m3.And the addition of Al also decreased the effective permeability observably at 1KHz and increase the effective permeability beyond 100 KHz of Fe73.4Cu1Nb3Si13.5B9Al0.1 magnetic core, the values of effective permeability of Fe73.4Cu1Nb3Si13.5B9Al0.1 magnetic core are 25035,10694 and 6506, while the values of Fe73.5Cu1Nb3Si13.5B9 magnetic core are 133354,9057 and 5139.The temperature of crystallization heat treatment influence the piezomagnetic properties of Fe73.5Cu1Nb3Si13.5B9 strip and Fe73.4Cu1Nb3Si13.5B9Al0.1 strip observably. In the range of 0~ critical stress σc,the value of Ls decrease sharply with the growth of σ,it is very sensitive. Comparison of two kinds of strip,the addition of Al worsen the soft magnetic properties but to improve the strip stress sensitive properties of Fe73.5Cu1Nb3Si13.5B9 strip, specifically reflected as:the rang of values of σc are 1.03 k Pa~3.09 k Pa from 525℃~555 of ℃ Fe73.4Cu1Nb3Si13.5B9Al0.1 strip while the rang of values of σc are 2.96 k Pa~4.44 k Pa of Fe73.5Cu1Nb3Si13.5B9 strip,values of Fe73.4Cu1Nb3Si13.5B9Al0.1 strip significantly less than Fe73.5Cu1Nb3Si13.5B9 strip; Comparison of the piezomagnetic effect value of two kinds of strip at 525℃ ~555 ℃ crystallization heat treatment temperature,the rang of |SI(%)|max Fe73.5Cu1Nb3Si13.5B9 strip is 5.5~15, significantly more than Fe73.4Cu1Nb3Si13.5B9Al0.1 strip( the rang of |SI(%)|max is 2~9); Suitable annealing temperature can also make the SI% of strip appeared positive value,the SI% of Fe73.5Cu1Nb3Si13.5B9 strip appeares positive value at 525 and 535℃ ℃,while the SI% of Fe73.4Cu1Nb3Si13.5B9Al0.1 strip at 535℃. |
PDF Full Text Request