Method of producing r-t-b sintered magnet
US-2019214191-A1 · Jul 11, 2019 · US
Method for producing rare earth sintered magnet
US11915845B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11915845-B2 |
| Application number | US-202217873791-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 26, 2022 |
| Priority date | Aug 18, 2021 |
| Publication date | Feb 27, 2024 |
| Grant date | Feb 27, 2024 |
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- Title
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Abstract
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A rare earth sintered magnet is produced by depositing a coating of rare earth-containing particles on the surface of a rare earth magnet body, and heat treating the magnet body for causing absorption and diffusion of rare earth element in the magnet body. The depositing step utilizes a particle impingement phenomenon.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing rare earth sintered magnet comprising the steps of: depositing a coating of R-containing particles on at least a portion of a surface of a rare earth magnet body; and heat treating the magnet body for causing absorption and diffusion of R in the magnet body, R being at least one element selected from rare earth elements, wherein the depositing step relies on an aerosol deposition method in which the R-containing particles are forced to impinge on the rare earth magnet body under the impetus of a differential pressure between an internal pressure of a chamber where the magnet body is held in place and a pressure of a supply for supplying the R-containing particles to the chamber, and the deposited coating is a porous coating and has a density which is 40 to 70% of the true density of the R-containing particles. 2. The method of claim 1 wherein said R is at least one element selected from Dy, Tb, and Ho. 3. The method of claim 1 wherein the rare earth magnet body comprises R 1 —Fe—B base composition, where R 1 is at least one element selected from Pr and Nd. 4. The method of claim 1 wherein in the step of heat treating, the magnet body is heat treated at temperature of 600 to 1,050° C. 5. The method of claim 1 wherein in the step of heat treating, the magnet body is heat treated at temperature of 600 to 1,050° C. and for 5 minutes to 80 hours. 6. The method of claim 1 wherein the aerosol deposition method is conducted by injecting an aerosol containing the R-containing particles through a nozzle to the surface of the rare earth magnet body at temperature of 0 to 100° C.
Assignees
Inventors
Classifications
- H01F1/0577Primary
sintered · CPC title
containing rare earths, i.e. Sc, Y, Lanthanides · CPC title
containing aluminium · CPC title
containing cobalt · CPC title
containing copper · CPC title
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Frequently asked questions
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- What does patent US11915845B2 cover?
- A rare earth sintered magnet is produced by depositing a coating of rare earth-containing particles on the surface of a rare earth magnet body, and heat treating the magnet body for causing absorption and diffusion of rare earth element in the magnet body. The depositing step utilizes a particle impingement phenomenon.
- Who is the assignee on this patent?
- Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification H01F1/0577. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 27 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).