Fe-BASED SOFT MAGNETIC ALLOY RIBBON AND MAGNETIC CORE COMPRISING SAME

Patent metadata

Field	Value
Publication number	US-2017323712-A1
Application number	US-201515533929-A
Country	US
Kind code	A1
Filing date	Nov 19, 2015
Priority date	Dec 22, 2014
Publication date	Nov 9, 2017
Grant date	—

Abstract

Conventional Fe-based soft magnetic alloy ribbons each containing Co and Ni have a problem that magnetic anisotropy that is neatly arranged in one direction cannot be induced easily even by a magnetic field annealing treatment and, therefore, a wound magnetic cores, a problem that a residual magnetic flux density Br is high, a problem that the hysteresis of the B—H curve becomes large (coercivity Hc becomes large), a problem that the change in incremental permeability relative to superimposed magnetic field becomes large, and others. In order to solve the problems, provided is an Fe-based soft magnetic alloy ribbon including a Cu-concentrated region present directly below a surface of the ribbon, and a Co-concentrated region present directly below the Cu-concentrated region. Also provided is a magnetic core including the Fe-based soft magnetic alloy ribbon.

First claim

1 . An Fe-based soft magnetic alloy ribbon comprising an Fe-based soft magnetic alloy including Co of 5 atomic % or more and 20 atomic % or less and Cu of 0.5 atomic % or more and 1.5 atomic % or less, the Fe-based soft magnetic alloy ribbon comprising:
a Cu-concentrated region present directly below a surface of the ribbon, and a Co-concentrated region present directly below the Cu-concentrated region.

2 . The Fe-based soft magnetic alloy ribbon according to claim 1 , the Fe-based soft magnetic alloy further comprising Ni of 15 atomic % or less and satisfying a relationship of 0.5≦c/b≦2.5, wherein b is an amount of Co and c is an amount of Ni.

3 . The Fe-based soft magnetic alloy ribbon according to claim 1 , further comprising Si of 8 atomic % or more and 17 atomic % or less, B of 5 atomic % or more and 12 atomic % or less, and M of 1.7 atomic % or more and 5 atomic % or less,
wherein M is at least one element selected from the group consisting of Mo, Nb, Ta, W, and V.

4 . A magnetic core comprising the Fe-based soft magnetic alloy ribbon according to claim 1 .

5 . The magnetic core according to claim 4 which is used for a current transformer for detection of a half sine alternating current.

6 . The Fe-based soft magnetic alloy ribbon according to claim 1 , further comprising:
an oxide layer present on the surface of the ribbon, and an alloy layer present in an inside of the ribbon, wherein the Cu-concentrated region is present in a vicinity of a boundary with the oxide layer and the alloy layer.

7 . The Fe-based soft magnetic alloy ribbon according to claim 1 , wherein
a peak value of Cu concentration of the Cu-concentrated region is 2 times or more and 12 times or less with respect to an average value of the Cu concentration which is measured in a depth from the surface of the ribbon in a range of 0.1 μm to 0.2 μm.

8 . The Fe-based soft magnetic alloy ribbon according to claim 1 , wherein a peak value of Co concentration of the Co-concentrated region is 1.02 times or more and 1.20 times or less with respect to an average value of the Co concentration which is measured in a depth from the surface of the ribbon in a range of 0.1 μm to 0.2 μm.

9 . The Fe-based soft magnetic alloy ribbon according to claim 1 , wherein
a peak of Cu concentration is present directly below the surface of the ribbon, and a peak of Co concentration is present directly below the peak of Cu concentration.

10 . The Fe-based soft magnetic alloy ribbon according to claim 1 , wherein
the alloy includes Cu of 0.7 atomic % or more and 1.2 atomic % or less.

11 . The Fe-based soft magnetic alloy ribbon according to claim 1 , wherein
the alloy includes Ni of 4 atomic % or more and 15 atomic % or less.

Assignees

• Hitachi Metals Ltd

Inventors

• Yoshizawa Yoshihito

Classifications

• C21D6/00

  Heat treatment of ferrous alloys · CPC title

• C22C45/02

  with iron as the major constituent · CPC title

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• H01F1/16

  in the form of sheets (H01F1/147 takes precedence) · CPC title

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title