R-T-B based sintered magnet
US-9520216-B2 · Dec 13, 2016 · US
Method for manufacturing permanent magnet
US2016104573A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016104573-A1 |
| Application number | US-201514974707-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 18, 2015 |
| Priority date | Jun 18, 2013 |
| Publication date | Apr 14, 2016 |
| Grant date | — |
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Abstract
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Provided is a method for manufacturing an Nd—Fe—B-based permanent magnet having an improved coercive force while reducing the amount of Dy used. A method for manufacturing a permanent magnet according to an embodiment of the present invention may comprise the steps of: preparing powder including Nd, Fe, B, and Cu; preparing a shaped body by forming a specific magnetic field in the powder; sintering the shaped body at a specific sintering temperature; and subjecting the sintered, shaped body to annealing at a annealing temperature determined according to the content of Cu.
First claim
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What is claimed is: 1 . A method for manufacturing a permanent magnet, which comprises: preparing powder including Nd, Fe, B and Cu; preparing a shaped body by forming a specific magnetic field in the powder; sintering the shaped body at a specific sintering temperature; and subjecting the sintered, shaped body to annealing at an annealing temperature determined according to the Cu content. 2 . The method for manufacturing a permanent magnet of claim 1 , wherein the annealing step comprises a plurality of annealings, and the annealing temperature determined according to the content of Cu is a first annealing of the plurality of annealings. 3 . The method for manufacturing a permanent magnet of claim 1 , wherein the content of Cu is 0.01 to 0.8 weight ratio to the powder. 4 . The method for manufacturing a permanent magnet of claim 3 , wherein the annealing temperature determined by the content of Cu is reduced as the content of Cu is increasing. 5 . The method for manufacturing a permanent magnet of claim 1 , wherein the specific sintering temperature is determined according to the content of Cu.
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Classifications
Treatment of metallic powder (mixing with lubricating or binding agents or with organic material B22F1/10) · CPC title
Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title
Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00 · CPC title
Aluminium · CPC title
containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title
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- What does patent US2016104573A1 cover?
- Provided is a method for manufacturing an Nd—Fe—B-based permanent magnet having an improved coercive force while reducing the amount of Dy used. A method for manufacturing a permanent magnet according to an embodiment of the present invention may comprise the steps of: preparing powder including Nd, Fe, B, and Cu; preparing a shaped body by forming a specific magnetic field in the powder; sinte…
- Who is the assignee on this patent?
- Univ Korea Res & Bus Found
- What technology area does this patent fall under?
- Primary CPC classification H01F1/0536. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 14 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).