trace rare-earth iron-based amorphous La-based nanocrystalline soft magnetic strip and the pressure of the magnetic properties of

Title: trace rare-earth iron-based amorphous La-based nanocrystalline soft magnetic strip and the pressure of the magnetic properties of
　　Author: Yang Cao Bing
　　Degree-granting units: Nanchang University
　　Keywords: amorphous material;; earth;; soft magnetic properties;; magnetic pressure
　　Summary:
　　In this paper, a single roll prepared by rapid quenching of the trace rare earth La and FeCuNbSiB FeSiB two iron-based amorphous strip, by X-ray diffraction analysis, differential thermal analysis by means of strip of glass-forming ability and crystallization structure was analyzed and studied the annealing process and packaging materials and other factors on amorphous soft magnetic material of the DC and AC characteristics, and finally examines the test Neodymium Magnets frequency, test parameters such as temperature and annealing temperature magnetic properties of its pressure impact on the situation.
　　Studies have shown that the incorporation of micro-La can improve FeSiB strip glass-forming ability, but also delayed the strip in the Fe-Si, Fe-B crystalline phase precipitates, enhanced thermal stability FeSiB strip. But FeCuNbSiB strip, and its glass forming ability of Fe-Si phase precipitation temperature is reduced, decreased thermal stability.
　　Annealing process of amorphous soft magnetic material of the DC and AC performance impact, and when the temperature is higher than 300 ℃, with the annealing temperature, the μi, μm, Bs, Br, μe, Q values ​​were increasing rapidly , and Hc, Pu was then rapidly decreased. 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 annealing temperature will result in high strip of soft magnetic properties decreased rapidly, even into a constant permeability, while the La content is too high can lead to performance degradation with a soft magnetic material. With increasing frequency, μe decreases, while the Q value is increased first and then decreased, near its center frequency in the 40KHz; when the encapsulation of the core, the use of hard materials, soft materials than better.
　　In addition, rare earth La on the Fe-based amorphous magnetic strip of pressure can also have a greater impact, including La-doped FeSiB strip, its stress resistance than the SI% decrease, while the La-doped FeCuNbSiB strip, its SI% is increased. At 1KHz-1MHz range, the greater the frequency of testing, the SI% greater, and with the La content increased, the SI% maximum frequency also increases. As stress increases, both the SI% amorphous material http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets increases first rapidly negative, and finally stabilized, and there is a stress-sensitive area, when the doped La, the width of the area will be reduced. One strip in doped La FeSiB after stress sensitive area from the 0-0.4MPa reduced to 0-0.2MPa; while in the doped La FeCuNbSiB strip after the stress sensitive area from the 0-0.3MPa reduced to 0-0.2MPa. When the test temperature is 40 ℃, the two amorphous strip SI% reached the maximum. And La-doped amorphous strip after the SI effect of temperature drift of the improvement; after annealing, the amorphous material effect significant improvement in the SI, which is not doped with a material of La FeSiB optimal annealing temperature 200 ℃, not mixed with materials of La FeCuNbSiB optimal annealing temperature was 300 ° C, and when they are in the doping La, its SI% were suddenly increased to 400 ℃.
　　Degree Year: 2010