| Iron-based nanocrystalline alloy--Fe73.5Cu1Nb3Si13.5B9which is a soft magneticmaterial research hotspot in recent years is widely used in making all kinds of Softmagnetic devices such as transformers, magnetic shielding, filters, inductors, chokesand relays because of its excellent soft magnetic properties. It can change thehysteresis loop shape and improve the magnetic properties of iron-basednanocrystalline alloy through longitudinal magnetic field heat treatment. So it is veryimportant and of great significance to study the longitudinal magnetic heat treatmentprocess of iron-based nanocrystalline alloy--Fe73.5Cu1Nb3Si13.5B9.In this dissertation, the Fe73.5Cu1Nb3Si13.5B9nanocrystalline strip and its coresmade in China had been systematically investigated Including the structure,microstructure and heat treatment process. Use the strips with the width of10mm andthe thickness of (25-30) μm as samples and then around them to circle magnetic coreswith30mm outside diameter and20mm inside diameter. Combined with the actualproduction of many enterprise, going vacuum heat treatment first, then put the coresin DC longitudinal magnetic field and AC longitudinal magnetic field heat treatment.Comparing the properties of the cores within or without longitudinal magnetic fieldheat treatment, conclude the best longitudinal magnetic field heat treatment process.The results show that it has not reach the best magnetic state after vacuum heattreatment for the Fe73.5Cu1Nb3Si13.5B9cores which still has great room to improve.The performance of the cores has improved greatly after DC longitudinal magneticfield heat treatment again. And got the best magnetic performance when the plus DC I=5A (H=318A/m), T=480℃, t=30min with μm=1299000, Hc=0.6748A/m,Pu=2.349J/m3, Bs=1.334T, Br=1.179T, Br/Bs=0.87723, volt-ampere characteristiccurve shows: when exciting current I=50mA, the induced voltage U=2.07mV; whenexciting current I=100mA, the induced voltage U=10.42mV.The various magnetic performance of Fe73.5Cu1Nb3Si13.5B9cores with AClongitudinal magnetic field heat treatment after Vacuum heat treatment becomesignificantly higher than ones with vacuum heat treatment. When plus AC I=5A(H =318a/m), T=480℃,30min: μmrise, Hc and Pu are reduced, Bs, Br and Br/Bsrise, magnetization curve and volt-ampere characteristic curve becomes steep,compared with ones with DC longitudinal magnetic field magnetic heat treatmentafter Vacuum heat treatment at the same condition, the soft magnetic performance ingeneral and the difference is not big. |
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