Method for manufacturing rare-earth magnet
US9257227B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2013 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | May 17, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2009/048
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.