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US-2024384366-A1 · Nov 21, 2024 · US
SmFeN-BASED ANISOTROPIC MAGNETIC POWDER AND COMPOSITE MATERIAL
US2025357028A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025357028-A1 |
| Application number | US-202519279669-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jul 24, 2025 |
| Priority date | Jun 10, 2021 |
| Publication date | Nov 20, 2025 |
| Grant date | — |
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Abstract
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A method of producing a SmFeN-based anisotropic magnetic powder is provided, the method including preparing a SmFeN-based anisotropic magnetic powder before dispersing comprising Sm, Fe, W, and N, and dispersing the SmFeN-based anisotropic magnetic powder before dispersing using a resin-coated metal media or a resin-coated ceramic media to obtain a SmFeN-based anisotropic magnetic powder. Also provided is a SmFeN-based anisotropic magnetic powder comprising Sm, Fe, W, and N and having an average particle size of less than 2.5 μm, a residual magnetization or of not less than 130 emu/g, and an oxygen content of not higher than 0.75% by mass.
First claim
Opening claim text (preview).
What is claimed is: 1 . A SmFeN-based anisotropic magnetic powder, comprising Sm, Fe, W, and N and having an average particle size of less than 2.5 μm, a residual magnetization σr of not less than 130 emu/g, and an oxygen content of not higher than 0.75% by mass. 2 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has an oxygen content of not higher than 0.6% by mass. 3 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has D50 that is a particle size corresponding to 50th percentile of a cumulative particle size distribution by volume of the SmFeN-based anisotropic magnetic powder of at least 0.5 μm but not more than 2.5 μm. 4 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has coercive force iHc of at least 13340 Oe, and squareness ratio Hk of at least 4140 Oe. 5 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has an average circularity of not less than 0.75. 6 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has D10 that is a particle size corresponding to 10th percentile of a cumulative particle size distribution by volume of the SmFeN-based anisotropic magnetic powder of at least 0.3 μm. 7 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder has D90 that is a particle size corresponding to 90th percentile of a cumulative particle size distribution by volume of the SmFeN-based anisotropic magnetic powder of at least 2 μm but not more than 5 μm. 8 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder is represented by the following formula: wherein 3≤v≤30, 5≤w≤15, 0≤x≤0.3, 0≤y≤2.5, 0≤z≤2.5, and 0≤u≤2.5. 9 . The SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the SmFeN-based anisotropic magnetic powder is SmFeWN powder or SmFeWLaN powder. 10 . A composite material comprising the SmFeN-based anisotropic magnetic powder according to claim 1 , and a resin. 11 . The composite material according claim 10 , wherein a mass ratio of the resin to the SmFeN-based anisotropic magnetic powder in the composite material is 0.10 to 0.15.
Assignees
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Classifications
containing rare earths, i.e. Sc, Y, Lanthanides · CPC title
Starting from compounds, e.g. oxides · CPC title
Magnetic · CPC title
- C22C38/001Primary
containing N · CPC title
- H01F1/059Primary
and Va elements, e.g. Sm2Fe17N2 · CPC title
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- What does patent US2025357028A1 cover?
- A method of producing a SmFeN-based anisotropic magnetic powder is provided, the method including preparing a SmFeN-based anisotropic magnetic powder before dispersing comprising Sm, Fe, W, and N, and dispersing the SmFeN-based anisotropic magnetic powder before dispersing using a resin-coated metal media or a resin-coated ceramic media to obtain a SmFeN-based anisotropic magnetic powder. Also …
- Who is the assignee on this patent?
- Nichia Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C38/001. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Nov 20 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).