Rare earth permanent magnet and method for producing rare earth permanent magnet
US10269475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2014 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Feb 19, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0577
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are a rare-earth permanent magnet whose magnet density after sintering is very high and a method for manufacturing a rare-earth permanent magnet. Thus, a magnet raw material is milled into magnet powder, and then, a compound 12 is formed by mixing the magnet powder thus milled with a binder. Next, the compound 12 thus formed is subjected to a hot-melt molding onto a supporting substrate 13 so as to form a green sheet 14 molded to a sheet-like shape. Thereafter, while the green sheet 14 thus molded is softened by heating, magnetic field orientation is carried out by applying a magnetic field to the green sheet 14 thus heated; and further, the green sheet 14 having been subjected to the magnetic field orientation is calcined by a vacuum sintering, which is further followed by a pressure sintering to produce a permanent magnet 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.