Processing of anisotropic permanent magnet without magnetic field
US-11948733-B2 · Apr 2, 2024 · US
METHOD OF PRODUCING PHOSPHATE-COATED SmFeN-BASED ANISOTROPIC MAGNETIC POWDER
US2024112838A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2024112838-A1 |
| Application number | US-202318477949-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 29, 2023 |
| Priority date | Sep 30, 2022 |
| Publication date | Apr 4, 2024 |
| Grant date | — |
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Abstract
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A method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method including stirring a slurry containing a raw material SmFeN-based anisotropic magnetic powder, water, a phosphate source, and an aluminum source to obtain a SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate.
First claim
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What is claimed is: 1 . A method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method comprising a phosphate treatment comprising stirring a slurry containing a raw material SmFeN-based anisotropic magnetic powder, water, a phosphate source, and an aluminum source to obtain a SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate. 2 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , further comprising in the phosphate treatment adding an inorganic acid to the slurry to adjust a pH of the slurry to at least 1 but not higher than 4.5. 3 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 2 , wherein the inorganic acid is added to adjust the pH of the slurry for at least 10 minutes. 4 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 2 , wherein the pH of the slurry is adjusted to at least 1.6 but not higher than 3.9. 5 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , further comprising heat-treating the SmFeN-based anisotropic magnetic powder having the surface coated with the phosphate at a temperature of at least 150° C. but not higher than 330° C. in an oxygen-containing atmosphere. 6 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , wherein an amount of an aluminum element in the aluminum source is not higher than 0.02 mol per 100 g of the raw material SmFeN-based anisotropic magnetic powder. 7 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the aluminum source is at least one selected from the group consisting of aluminum chloride and aluminum sulfate. 8 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the slurry further contains a calcium source. 9 . The method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder according to claim 1 , wherein the phosphate-coated SmFeN-based anisotropic magnetic powder has a phosphate content of higher than 0.5% by mass.
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containing rare earths, i.e. Sc, Y, Lanthanides · CPC title
containing N · CPC title
Starting from compounds, e.g. oxides · CPC title
starting from solid metal compounds · CPC title
by powder metallurgy · CPC title
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- What does patent US2024112838A1 cover?
- A method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method including stirring a slurry containing a raw material SmFeN-based anisotropic magnetic powder, water, a phosphate source, and an aluminum source to obtain a SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate.
- Who is the assignee on this patent?
- Nichia Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/059. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 04 2024 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).