Rare-earth sintered magnet and method for manufacturing same
US-2015235747-A1 · Aug 20, 2015 · US
Method for manufacturing rare-earth magnet
US9257227B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9257227-B2 |
| Application number | US-201313750576-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 25, 2013 |
| Priority date | Jan 26, 2012 |
| Publication date | Feb 9, 2016 |
| Grant date | Feb 9, 2016 |
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- Title
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Abstract
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Provided is a manufacturing method of a rare-earth magnet with high coercive force, including a first step of pressing-forming powder as a rare-earth magnet material to form a compact S, the powder including a RE-Fe—B main phase MP (RE: at least one type of Nd and Pr) and a RE-X alloy (X: metal element) grain boundary phase surrounding the main phase; and second step of bringing a modifier alloy M into contact with the compact S or a rare-earth magnet precursor C obtained by hot deformation processing of the compact S, followed by heat treatment to penetrant diffuse melt of the modifier alloy M into the compact S or the rare-earth magnet precursor C to manufacture the rare-earth magnet RM, the modifier alloy including a RE-Y (Y: metal element and not including a heavy rare-earth element) alloy having a eutectic or a RE-rich hyper-eutectic composition.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for manufacturing a rare-earth magnet, comprising the steps of: first step of pressing-forming powder as a rare-earth magnet material to form a compact, the powder including a RE-Fe-B main phase and a RE-X alloy grain boundary phase surrounding the main phase, wherein RE is at least one type of Nd and Pr, and X is a metal element; and second step of bringing a modifier alloy into contact with the compact, followed by heat treatment to penetrant-diffuse melt of the modifier alloy into the compact to manufacture the rare-earth magnet, the modifier alloy including a Nd—Pr—Cu alloy or a Nd—Pr—Al alloy as an alloy having a eutectic composition including Nd and Pr or a Nd, Pr-rich hyper-eutectic composition, and the heat treatment in the second step is performed at a temperature in a range of from 480 to 580° C.
Assignees
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Classifications
- H01F41/0293Primary
diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets · CPC title
- H01F41/005Primary
Impregnating or encapsulating (insulating of windings H01F41/12) · CPC title
by pulverising a quenched ribbon · CPC title
Alloys containing less than 50% by weight of each constituent · CPC title
Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00 · CPC title
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- What does patent US9257227B2 cover?
- Provided is a manufacturing method of a rare-earth magnet with high coercive force, including a first step of pressing-forming powder as a rare-earth magnet material to form a compact S, the powder including a RE-Fe—B main phase MP (RE: at least one type of Nd and Pr) and a RE-X alloy (X: metal element) grain boundary phase surrounding the main phase; and second step of bringing a modifier allo…
- Who is the assignee on this patent?
- Haga Kazuaki, Miyamoto Noritaka, Shoji Tetsuya, and 4 more
- What technology area does this patent fall under?
- Primary CPC classification H01F41/0293. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 09 2016 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).