Soft magnetic alloy and magnetic device

Patent metadata

Field	Value
Publication number	US-11328847-B2
Application number	US-201815881118-A
Country	US
Kind code	B2
Filing date	Jan 26, 2018
Priority date	Jan 30, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A soft magnetic alloy including a compositional formula of ((Fe(1−(α+β))X1αX2β)(1−(a+b+c+e))MaBbPcCue)1−fCf, wherein X1 is one or more selected from the group consisting Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements, “M” is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, W, and V, 0.030<a≤0.14, 0.028≤b≤0.20, 0≤c≤0.030, 0<e≤0.030, 0<f≤0.040, α≥0, β≥0, and 0≤α+β≤0.50 are satisfied.

First claim

The invention claimed is:

1. A soft magnetic alloy comprising a compositional formula of ((Fe (1−(α+β)) X1 α X2 β ) (1−(a+b+c+e)) M a B b P c Cu e ) 1−f C f , wherein
X1 is one or more selected from the group consisting Co and Ni,
X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements,
“M” is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, W, and V,
0.032≤a≤0.140,
0.028≤b≤0.200,
c=0,
0.001≤e≤0.030,
0.001≤f≤0.030,
α≥0,
β≥0, and
0≤α+β≤0.50 are satisfied,
a magnetic flux density Bs of the soft magnetic alloy is 1.20 T or more, and
a magnetic permeability μ′ of the soft magnetic alloy at 1 kHz is 55000 or more.

2. The soft magnetic alloy as set forth in claim 1 , wherein 0≤α{1−(a+b+c+e)}(1−f)≤0.40 is satisfied.

3. The soft magnetic alloy as set forth in claim 1 , wherein α=0 is satisfied.

4. The soft magnetic alloy as set forth in claim 1 , wherein 0≤β{1−(a+b+c+e)}(1−f)≤0.030 is satisfied.

5. The soft magnetic alloy as set forth in claim 1 , wherein β=0 is satisfied.

6. The soft magnetic alloy as set forth in claim 1 , wherein α=β=0 is satisfied.

7. The soft magnetic alloy as set forth in claim 1 comprising a nanohetero structure composed of an amorphous phase and initial fine crystals, the fine crystals existing in the amorphous phase, and the fine crystals having an average grain size of 0.1 to 15 nm.

8. The soft magnetic alloy as set forth in claim 7 , wherein the fine crystals have an average grain size of 0.3 to 10 nm.

9. The soft magnetic alloy as set forth in claim 1 comprising a structure composed of Fe-based nanocrystals.

10. The soft magnetic alloy as set forth in claim 9 , wherein the Fe-based nanocrystals have an average grain size of 5 to 30 nm.

11. The soft magnetic alloy as set forth in claim 1 , wherein the soft magnetic alloy is formed in a ribbon form.

12. The soft magnetic alloy as set forth in claim 1 , wherein the soft magnetic alloy is formed in a powder form.

13. A magnetic device comprising the soft magnetic alloy as set forth in claim 1 .

Assignees

• Tdk Corp

Inventors

• Harada Akihiro
• Matsumoto Hiroyuki
• Horino Kenji
• Yoshidome Kazuhiro
• Hasegawa Akito
• Amano Hajime
• Ara Kensuke
• Tokoro Seigo
• Otsuka Shota

Classifications

• H01F1/15308

  based on Fe/Ni (H01F1/15325 takes precedence) · CPC title

• C22C45/00

  Amorphous alloys (making amorphous non-ferrous alloys C22C1/11) · CPC title

• C22C2202/02

  Magnetic · CPC title

• H01F1/15341

  Preparation processes therefor · CPC title

• H01F1/20

  in the form of particles, e.g. powder (H01F1/147 takes precedence) · CPC title