Soft magnetic alloy and magnetic device

Patent metadata

Field	Value
Publication number	US-10847292-B2
Application number	US-201816055536-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Aug 7, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A soft magnetic alloy is composed of a Fe-based nanocrystal and an amorphous phase. In the soft magnetic alloy, S2-S1>0 is satisfied, where S1 (at %) denotes an average content rate of Si in the Fe-based nanocrystal and S2 (at %) denotes an average content rate of Si in the amorphous phase. In addition, the soft magnetic alloy has a composition formula of ((Fe (1−(α+β) )X1 α X2 β ) (1−(a+b+c+d+e+f)) M a B b Si c P d Cr e Cu f ) 1−g C g . X1 is one or more selected from the group consisting of Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, S and a rare earth element, and M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, V and W. In the composition formula, a to g, α and β are in specific ranges.

First claim

The invention claimed is:

1. A soft magnetic alloy comprising Fe as a main component and Si, wherein
the soft magnetic alloy comprises a Fe-based nanocrystal and an amorphous phase,
S2−S1>0 is satisfied, where S1 (at %) denotes an average content rate of Si in the Fe-based nanocrystal and S2 (at %) denotes an average content rate of Si in the amorphous phase, and
the soft magnetic alloy has a composition formula of ((Fe (1−(α+β) )X1 α X2 β ) (1−(a+b+c+d+e+f)) M a B b Si c P d Cr e Cu f ) 1−g C g , wherein
X1 is one or more selected from the group consisting of Co and Ni,
X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, S and a rare earth element,
M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, V and W, and
0≤a≤0.14

0≤b≤0.20

0<c≤0.17

0≤d≤0.15

0≤e≤0.040

0≤f≤0.030

0≤g<0.030

0≤α{1−(a+b+c+d+e+f)}(1−g)≤0.40

0≤β{1−(a+b+c+d+e+f)}(1−g)≤0.030

0≤α+β≤0.50.

2. The soft magnetic alloy according to claim 1 , wherein S2−S1≥2.00 is satisfied.

3. The soft magnetic alloy according to claim 2 , wherein the soft magnetic alloy is formed in a ribbon form.

4. The soft magnetic alloy according to claim 2 , wherein the soft magnetic alloy is formed in a powder form.

5. A magnetic device comprising the soft magnetic alloy according to claim 2 .

6. The soft magnetic alloy according to claim 1 , wherein an average grain size of the Fe-based nanocrystals is 5.0 nm or more and 30 nm or less.

7. The soft magnetic alloy according to claim 6 , wherein the soft magnetic alloy is formed in a ribbon form.

8. The soft magnetic alloy according to claim 2 , wherein the soft magnetic alloy is formed in a powder form.

9. A magnetic device comprising the soft magnetic alloy according to claim 6 .

10. The soft magnetic alloy according to claim 1 , wherein 0.73≤1−(a+b+c+d+e+f)≤0.95 is satisfied.

11. The soft magnetic alloy according to claim 1 , wherein α=0 is satisfied.

12. The soft magnetic alloy according to claim 1 , wherein β=0 is satisfied.

13. The soft magnetic alloy according to claim 1 , wherein α=β=0 is satisfied.

14. The soft magnetic alloy according to claim 1 , wherein the soft magnetic alloy is formed in a ribbon form.

15. The soft magnetic alloy according to claim 1 , wherein the soft magnetic alloy is formed in a powder form.

16. A manetic device comprising the soft magnetic alloy according to claim 1 .

Assignees

• Tdk Corp

Inventors

• Yoshidome Kazuhiro
• Hasegawa Akito
• Matsumoto Hiroyuki
• Horino Kenji
• Harada Akihiro
• Goto Syota
• Nakahata Isao

Classifications

• C22C2200/02

  Amorphous · CPC title

• C22C38/004

  Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title

• C22C38/14

  containing titanium or zirconium · CPC title

• C22C38/12

  containing tungsten, tantalum, molybdenum, vanadium, or niobium · CPC title

• C22C38/32

  with boron · CPC title