Electric machines using axially-magnetized curvilinear permanent magnets
US-2024429761-A1 · Dec 26, 2024 · US
Method of manufacturing rare earth magnet
US2016336112A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016336112-A1 |
| Application number | US-201415107631-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 19, 2014 |
| Priority date | Dec 27, 2013 |
| Publication date | Nov 17, 2016 |
| Grant date | — |
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Abstract
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A method of manufacturing a rare earth magnet includes: preparing a powder by preparing a rapidly-solidified ribbon by liquid solidification, and by crushing the rapidly-solidified ribbon; manufacturing a sintered compact by press-forming the powder; and manufacturing a rare earth magnet by performing hot deformation processing on the sintered compact to impart anisotropy to the sintered compact. In this method, the rapidly-solidified ribbon is a plurality of fine crystal grains. The powder includes a RE-Fe—B main phase and a grain boundary phase of a RE-X alloy present around the main phase. RE represents at least one of Nd and Pr. X represents a metal element. A nitrogen content in the powder is adjusted to be at least 1,000 ppm and less than 3,000 ppm by performing at least one of the preparation of the powder and the manufacturing of the sintered compact in a nitrogen atmosphere.
First claim
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1 . A method of manufacturing a rare earth magnet comprising: preparing a powder by preparing a rapidly-solidified ribbon by liquid solidification, and by crushing the rapidly-solidified ribbon, the rapidly-solidified ribbon being a plurality of fine crystal grains, the powder including a RE-Fe—B main phase and a grain boundary phase of a RE-X alloy present around the main phase, RE representing at least one of Nd and Pr, and X representing a metal element; manufacturing a sintered compact by press-forming the powder; and manufacturing a rare earth magnet by performing hot deformation processing on the sintered compact to impart anisotropy to the sintered compact, wherein a nitrogen content in the powder is adjusted to be at least 1,000 ppm and less than 3,000 ppm by performing at least one of the preparation of the powder and the manufacturing of the sintered compact in a nitrogen atmosphere. 2 . The method according to claim 1 , wherein a grain size of the crushed powder is adjusted to be in a range of 75 μm to 300 μm, and an average grain size of the main phase constituting the sintered compact is adjusted to be 300 nm or less. 3 . The method according to claim 1 , wherein a content ratio of RE in the RE-Fe—B main phase is 29 mass % to 32 mass %. 4 . The method according to claim 1 , wherein the nitrogen content in the powder is adjusted to be in a range of 1,000 ppm to 2,500 ppm.
Assignees
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Classifications
- H01F41/0273Primary
Imparting anisotropy (methods and devices for magnetising permanent magnets H01F13/003) · CPC title
- H01F1/0577Primary
sintered · CPC title
- H01F41/0266Primary
Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title
pressed, e.g. hot working · CPC title
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- What does patent US2016336112A1 cover?
- A method of manufacturing a rare earth magnet includes: preparing a powder by preparing a rapidly-solidified ribbon by liquid solidification, and by crushing the rapidly-solidified ribbon; manufacturing a sintered compact by press-forming the powder; and manufacturing a rare earth magnet by performing hot deformation processing on the sintered compact to impart anisotropy to the sintered compac…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01F41/0273. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Nov 17 2016 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).