Soft magnetic powder, powder magnetic core, magnetic element, and electronic device

Patent metadata

Field	Value
Publication number	US-2017148554-A1
Application number	US-201615352929-A
Country	US
Kind code	A1
Filing date	Nov 16, 2016
Priority date	Nov 25, 2015
Publication date	May 25, 2017
Grant date	—

Abstract

A soft magnetic powder has a composition represented by Fe 100-a-b-c-d-e-f Cu a Si b B c M d M′ e X f (at %) (wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M′ is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1≦a≦3, 0<b≦30, 0<c≦25, 5≦b+c≦30, 0.1≦d≦30, 0≦e≦10, and 0≦f≦10), wherein a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more, and the Vickers hardness of the particles is 1000 or more and 3000 or less.

First claim

What is claimed is:

1 . A soft magnetic powder, wherein
the powder has a composition represented by Fe 100-a-b-c-d-e-f Cu a Si b B c M d M′ e X f (at %) (wherein M is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti, and Mo, M′ is at least one element selected from the group consisting of V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, and Re, X is at least one element selected from the group consisting of C, P, Ge, Ga, Sb, In, Be, and As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1≦a≦3, 0<b≦30, 0<c≦25, 5≦b+c≦30, 0.1≦d≦30, 0≦e≦10, and 0≦f≦10; a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more; and the Vickers hardness of the particles is 1000 or more and 3000 or less.

2 . The soft magnetic powder according to claim 1 , wherein the volume resistivity of a green compact is 1 kΩ·cm or more and 500 kΩ·cm or less.

3 . The soft magnetic powder according to claim 1 , wherein the powder further contains an amorphous structure.

4 . A powder magnetic core, comprising the soft magnetic powder according to claim 1 .

5 . A powder magnetic core, comprising the soft magnetic powder according to claim 2 .

6 . A powder magnetic core, comprising the soft magnetic powder according to claim 3 .

7 . A magnetic element, comprising the powder magnetic core according to claim 4 .

8 . A magnetic element, comprising the powder magnetic core according to claim 5 .

9 . A magnetic element, comprising the powder magnetic core according to claim 6 .

10 . An electronic device, comprising the magnetic element according to claim 7 .

11 . An electronic device, comprising the magnetic element according to claim 8 .

12 . An electronic device, comprising the magnetic element according to claim 9 .

Assignees

• Seiko Epson Corp

Inventors

• Kudo Yasuko

Classifications

• H01F1/15333 Primary

  containing nanocrystallites, e.g. obtained by annealing · CPC title

• H01F1/14791 Primary

  Fe-Si-Al based alloys, e.g. Sendust · CPC title

• H01F27/255

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F3/08

  made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) · CPC title

• H01F1/1535

  by powder metallurgy, e.g. spark erosion · CPC title