La of rare earth iron-based amorphous and nanocrystalline soft magnetic materials with magnetic properties and pressure
In this paper, a single roll prepared by rapid quenching of the rare earth La FeCuNbSiB FeSiB and two iron-based amorphous material, by X-ray diffraction analysis, differential thermal analysis by means of strips of glass forming ability and crystallizationstructures were analyzed and studied the annealing process and packaging material and other factors on the amorphous soft magnetic material of the DC and AC characteristics of, and finally inspected the test frequency, test temperature and the annealing temperature and the pressure of its magnetic propertiesof the situation.
Studies have shown that the incorporation of trace La FeSiB strip can improve the glass forming ability, but also delayed the strip in the Fe-Si, Fe-B crystalline phases of precipitation, increased thermal stability FeSiB strip.But for FeCuNbSiB strip, the glass forming ability and the precipitation of Fe-Si phase the temperature is reduced, the thermal stability decreased.
Annealing process on the amorphous material in the soft magnetic properties of DC and AC great, when the temperature higher than 300 ℃, with the annealing temperature increases, the μi, μm, Bs, Br, μe, Q values were rapidly increasing, and Hc, Pu then was rapidly reduced.One FeSiB-La strip annealing process is the best 400 ℃ × 120min, precipitated phase mainly Fe0.9Si0.1 (BCC); and FeCuNbSiB-La strip was 500 ℃ × 120min, precipitated phase mainly Fe3Si(FCC, BCC), the high annealing temperature will result in soft magnetic properties with a rapid decline in wood, or even into a constant permeability, while high content of La can lead to performance degradation of soft magnetic strip.With increasing frequency, μe decreases, while the Q value is decreased after increasing, near its center frequency 40KHz; When the core is encapsulated, the use of hard materials, soft materials than better.
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In addition, rare earth La on the Fe-based amorphous magnetic strip can also have a greater pressure effect, which in doped La FeSiB strip, its stress resistance than the SI% decrease, while the La-doped FeCuNbSiB strip, itsSI% is increased.In 1KHz-1MHz range, test frequency the greater the greater the SI%, and with the La content increased, the SI% maximum frequency also increases.As stress increases, both the SI% amorphous material increases first rapidly negative, and finally stabilized, and there exists a stress sensitive area, when the doping La, the width of the area will be reduced.One strip of doped La FeSiB after the stress sensitive area from the 0-0.4MPa reduced to 0-0.2MPa; while in doped La FeCuNbSiB strip, the stress sensitive area from the 0-0.3MPa reduced to 0-0.2MPa.When the test temperature is 40 ℃, the two amorphous material in the SI% reached the maximum.And La doped amorphous ribbons after the SI effect of temperature drift was improved; After annealing, the amorphous material of the SI effect significant improvement, which is not doped La's FeSiB Strip optimal annealing temperature was200 ℃, not doped La's FeCuNbSiB Strip optimal annealing temperature was 300 ° C, and when they are doped with La, its SI% 400 ℃ were suddenly increased.
