MAGNET CORE FOR LOW-FREQUENCY APPLICATIONS AND METHOD FOR PRODUCING A MAGNET CORE FOR LOW-FREQUENCY APPLICATIONS

摘要

A magnet core for low-frequency applications and method for producing a magnet core for low-frequency applications is provided. The magnet core is made of a spiral-wound, soft-magnetic, nanocrystalline strip. The strip essentially has the alloy composition FeRestCoaCubNbcSidBeCf, 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. The magnet core has a saturation magnetostriction λs of λs<2 ppm, a starting permeability μ1 of μ1>100 000 and a maximum permeability μmax of μmax>400 000. In addition, a sealing metal oxide coating is provided on the surfaces of the strip.

主权项

1. A method for producing a magnet core for low-frequency applications from a spiral-wound, soft-magnetic, nanocrystalline strip, the strip essentially having the alloy composition FeRestCoaCubNbcSidBeCf, 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, wherein the strip is provided with a coating with a metal oxide solution and/or an acetyl-acetone-chelate complex with a metal, which coating forms a sealing metal oxide coating during a subsequent heat treatment for the nanocrystallisation of the strip, and wherein, in the heat treatment for the nanocrystallisation of the strip, a saturation magnetostriction λs of |λs|<2 ppm is set.