Electric machines using axially-magnetized curvilinear permanent magnets
US-2024429761-A1 · Dec 26, 2024 · US
Method for producing rare earth magnet and rare earth magnet
US2025125089A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025125089-A1 |
| Application number | US-202418891031-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 20, 2024 |
| Priority date | Oct 11, 2023 |
| Publication date | Apr 17, 2025 |
| Grant date | — |
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- Title
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Abstract
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A method for producing a rare earth magnet that can improve magnetic properties by both increasing a density of a sintered body and suppressing strain of a magnetic phase. The method includes preparing a magnetic powder containing Sm, Fe, and N, preparing a modifier powder containing at least one of metallic zinc or a zinc alloy, mixing the magnetic powder and the modifier powder to obtain a mixed powder, performing compression molding on the mixed powder in a magnetic field to obtain a magnetic field molded body, and performing pressure sintering on the magnetic field molded body to obtain a sintered body. In the pressure sintering, the magnetic field molded body is pressed and sintered at a pressure of 500 MPa or more and 900 MPa or less and at a temperature of 360° C. or more and 390° C. or less for 1 hour or more and 24 hours or less.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method for producing a rare earth magnet, comprising: preparing a magnetic powder containing Sm, Fe, and N; preparing a modifier powder containing at least one of metallic zinc or a zinc alloy; mixing the magnetic powder and the modifier powder to obtain a mixed powder; performing compression molding on the mixed powder in a magnetic field to obtain a magnetic field molded body; and performing pressure sintering on the magnetic field molded body to obtain a sintered body, wherein in the pressure sintering, the magnetic field molded body is pressed and sintered at a pressure of 500 MPa or more and 900 MPa or less and at a temperature of 360° C. or more and 390° C. or less for 1 hour or more and 24 hours or less. 2 . A rare earth magnet comprising a sintered body of a mixed powder containing a magnetic powder containing Sm, Fe, and N, and a modifier powder containing at least one of metallic zinc or a zinc alloy, wherein a full width at half maximum of a diffraction peak of a (024) plane measured by an X-ray diffraction of the sintered body is 0.2 degrees or less, and wherein a bulk density of the sintered body is 6.2 g/cm 3 or more.
Assignees
Inventors
Classifications
of rhombic or rhombohedral Th2Zn17 structure or hexagonal Th2Ni17 structure · CPC title
containing titanium or zirconium · CPC title
- H01F41/0266Primary
Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title
containing tungsten, tantalum, molybdenum, vanadium, or niobium · CPC title
containing N · CPC title
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- What does patent US2025125089A1 cover?
- A method for producing a rare earth magnet that can improve magnetic properties by both increasing a density of a sintered body and suppressing strain of a magnetic phase. The method includes preparing a magnetic powder containing Sm, Fe, and N, preparing a modifier powder containing at least one of metallic zinc or a zinc alloy, mixing the magnetic powder and the modifier powder to obtain a mi…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd, Nichia Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F41/0266. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 17 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).