22-08-2013 дата публикации
Номер: US20130214893A1
Magnet core for low-frequency applications and method for producing a magnet core for low-frequency applications 1. Magnet core for low-frequency applications , which is made of a spiral-wound , soft-magnetic , nanocrystalline strip , the strip essentially having the alloy composition{'br': None, 'sub': Rest', 'a', 'b', 'c', 'd', 'e', 'f, 'FeCoCuNbSiBC,'}wherein a, b, c, d, e and f are stated in atomic percent and 0≦a≦1; 0.7≦b≦1.4; 2.5≦c≦3.5; 14.5≦d≦16.5; 5.5≦e≦8 and 0≦f≦1, and cobalt may wholly or partially be replaced by nickel,{'sub': s', 's', '1', '1', 'max', 'max, 'the magnet core having a saturation magnetostriction λof λ<2 ppm, a starting permeability μof μ>100 000 and a maximum permeability μof μ>400 000, and a sealing metal oxide coating being provided on the surfaces of the strip.'}2. Magnet core according to claim 1 ,{'sup': nd', 'rd, 'wherein the oxide coating contains magnesium oxide and/or zirconium oxide and/or oxides of an element selected from the group of Be, Al, Ti, V, Nb, Ta, Ce, Nd, Gd, further elements of the 2and 3main groups and of the group of rare earth metals.'}3. Magnet core according to claim 1 ,{'sub': max', 'max', 'max, 'wherein the magnet core has a maximum permeability μof μ>400 000, preferably μ>600 000.'}4. Magnet core according to claim 1 ,{'sub': 1', '1', '1, 'wherein the magnet core has a starting permeability μof μ>150 000, preferably μ>200 000.'}5. Magnet core according to claim 1 ,{'sub': s', 's', 's, 'wherein the magnet core has a saturation magnetostriction λof λ<1 ppm, preferably λ<0.5 ppm.'}6. Magnet core according to claim 1 ,wherein the strip has a strip thickness d of d<24 μm, preferably d<21 μm.7. Magnet core according to claim 1 ,{'sub': a', 'a', 'a, 'wherein the strip has an effective roughness R(eff) of R(eff)<7%, preferably R(eff)<5%.'}8. Magnet core according to claim 1 ,wherein the strip has a total metalloid content c+d+e+f>22.5%, preferably c+d+e+f>23.5%.9. Magnet core according to claim 1 ,{'sub': R', 'S', 'R ...
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