Ultrafine-crystalline alloy ribbon, fine-crystalline, soft-magnetic alloy ribbon, and magnetic device comprising it

Patent metadata

Field	Value
Publication number	US-10115509-B2
Application number	US-201314426866-A
Country	US
Kind code	B2
Filing date	Sep 10, 2013
Priority date	Sep 10, 2012
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

An ultrafine-crystalline alloy ribbon having a composition represented by the general formula of Fe 100-x-y-z A x B y X z , wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers meeting the conditions of 0<x≤5, 8≤y≤22, 0≤z≤10, and x+y+z≤25 by atomic %, and a structure in which ultrafine crystal grains having an average particle size of 30 nm or less being dispersed in a proportion of more than 0% and less than 30% by volume in an amorphous matrix; an ultrafine crystal grains-depleted region comprising ultrafine crystal grains at a number density of less than 500/μm 2 being formed in a region of 0.2 mm in width from each side of the ribbon.

First claim

What is claimed is:

1. An ultrafine-crystalline alloy ribbon having a structure, in which more than 0% and less than 30% by volume of ultrafine crystal grains having an average particle size of 30 nm or less are dispersed in an amorphous matrix; an ultrafine crystal grains-depleted region having a smaller number density of ultrafine crystal grains than in a center portion of said ribbon being formed in a region of 0.2 mm in width from each edge of the ribbon along a longitudinal direction; and the number density of ultrafine crystal grains having particle sizes of 3 nm or more being 300/μm 2 or less in said ultrafine crystal grains-depleted region, and 500/μm 2 or more in the center portion of said ribbon,
wherein a distance between said edge and a position at which a number density of ultrafine crystal grains is 1/2 of a number density of ultrafine crystal grains in said center portion is 0.5 to 0.6 mm, the distance being 1 to 2.4% of the entire width of said ultrafine-crystalline alloy ribbon,
wherein the total width of both ultrafine crystal grains-depleted regions is 5% or less of the entire width of said ultrafine-crystalline alloy ribbon, and
wherein said ultrafine-crystalline alloy ribbon is made of a magnetic alloy having a composition represented by the general formula of Fe 100-x-y-z A x B y X z , wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, part of Fe may be substituted by at least one element D selected from the group consisting of Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta, and W, part of Fe may be substituted by at least one element selected from the group consisting of Re, Y, Zn, As, Ag, In, Sn, Sb, platinum-group elements, Bi, N, O, and rare earth elements, and x, y and z are numbers meeting the conditions of 0<x≤5, 8≤y≤22, 0≤z≤10, and x+y+z≤25 by atomic %.

2. The ultrafine-crystalline alloy ribbon according to claim 1 , wherein part of Fe is substituted by at least one element D selected from the group consisting of Ni, Mn, Co, V, Cr, Ti, Zr, Nb, Mo, Hf, Ta and W.

3. The ultrafine-crystalline alloy ribbon according to claim 1 , wherein part of Fe is substituted by at least one element selected from the group consisting of Re, Y, Zn, As, Ag, In, Sn, Sb, platinum-group elements, Bi, N, O, and rare earth elements.

4. A fine-crystalline, soft-magnetic alloy ribbon obtained by heat-treating the ultrafine-crystalline alloy ribbon recited in claim 1 , which has a structure in which 30% or more by volume of fine crystal grains having an average particle size of 60 nm or less are dispersed in an amorphous matrix; grain-grown regions comprising fine crystal grains having larger particle sizes than said average particle size being formed in both side portions; and the total width of both grain-grown regions being 5% or less of the entire width of said fine-crystalline, soft-magnetic alloy ribbon,
wherein the width of each grain-grown region is 0.2% or more of the entire width of said fine-crystalline, soft-magnetic alloy ribbon.

5. A magnetic device comprising the fine-crystalline, soft-magnetic alloy ribbon recited in claim 4 .

6. The fine-crystalline, soft-magnetic alloy ribbon according to claim 4 , wherein each grain-grown region is formed in a region of 0.2 mm in width in each side portion of said fine-crystalline, soft-magnetic alloy ribbon.

Assignees

• Hitachi Metals Ltd

Inventors

• Ohta Motoki
• Yoshizawa Yoshihito

Classifications

• C22C45/02

  with iron as the major constituent · CPC title

• C22C38/16

  containing copper · CPC title

• C21D2201/03

  Amorphous or microcrystalline structure · CPC title

• C22C33/003

  making amorphous alloys · CPC title

• C22C38/06

  containing aluminium · CPC title