IP Library › Granted Patent US 12665110
Granted Patent B2
US 12665110 · App. 17/640,382 · Granted Jun 23, 2026

Permanent magnet alloy, method for producing the same, permanent magnet, and method for producing the same

Inventors: Ryosuke Kainuma (Sendai, JP); Toshihiro Omori (Sendai, JP); Xiao Xu (Sendai, JP); Naoki Hashimoto (Sendai, JP); Tomohito Maki (Tokyo, JP)
Assignees: TOHOKU UNIVERSITY; PROTERIAL, LTD.
H01F1/047H01F41/0253
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Quick Facts
Patent No.
US 12665110
App. No.
17/640,382
Granted
Jun 23, 2026
Kind
B2
Abstract

A permanent magnet alloy according to the present disclosure contains Mn at a content not lower than 41% by atom and not higher than 53% by atom; Al at a content not lower than 46% by atom and not higher than 53% by atom; and Cu at a content not lower than 0.5% by atom and not higher than 10% by atom. The alloy contains a stable phase, having a tetragonal structure, at a ratio not lower than 50%.

Claims (29)

1 . A permanent magnet alloy, comprising:

Mn at a content not lower than 41% by atom and not higher than 53% by atom;

Al at a content not lower than 46% by atom and not higher than 53% by atom;

Cu at a content not lower than 0.5% by atom and not higher than 10% by atom, and

C at a content lower than 0.8% by atom including 0% by atom, wherein

the permanent magnet alloy contains a stable phase, having a tetragonal structure, at a ratio not lower than 50% by mass.

2 . The permanent magnet alloy of claim 1 , wherein the permanent magnet alloy comprises:

Mn at a content not lower than 44% by atom and not higher than 53% by atom;

Al at a content not lower than 46% by atom and not higher than 51.5% by atom; and

Cu at a content not lower than 0.5% by atom and not higher than 7% by atom.

3 . The permanent magnet alloy of claim 1 , wherein the permanent magnet alloy comprises:

Mn at a content not lower than 45% by atom and not higher than 51.5% by atom;

Al at a content not lower than 46% by atom and not higher than 50% by atom; and

Cu at a content not lower than 0.5% by atom and not higher than 5% by atom.

4 . The permanent magnet alloy of claim 1 , wherein a total content of Mn, Al, Cu and C is 100% by atom (the permanent magnet alloy may contain unavoidable impurities).

5 . A permanent magnet, comprising:

Mn at a content not lower than 41% by atom and not higher than 53% by atom;

Al at a content not lower than 46% by atom and not higher than 53% by atom;

Cu at a content not lower than 0.5% by atom and not higher than 10% by atom, and

C at a content lower than 0.8% by atom including 0% by atom, wherein

the permanent magnet contains a stable phase, having a tetragonal structure, at a ratio not lower than 50% by mass.

6 . The permanent magnet of claim 5 , wherein the permanent magnet comprises:

Mn at a content not lower than 44% by atom and not higher than 53% by atom;

Al at a content not lower than 46% by atom and not higher than 51.5% by atom; and

Cu at a content not lower than 0.5% by atom and not higher than 7% by atom.

7 . The permanent magnet of claim 5 , wherein the permanent magnet comprises:

Mn at a content not lower than 45% by atom and not higher than 51.5% by atom;

Al at a content not lower than 46% by atom and not higher than 50% by atom; and

Cu at a content not lower than 0.5% by atom and not higher than 5% by atom.