Rare earth magnet and production method thereof
US12191059B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 14, 2022 |
| Grant date | Jan 7, 2025 |
| Priority date | — |
| Expiry date | Dec 7, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2304/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A Sm—Fe—N-based rare earth magnet more resistant to demagnetization than ever before in an environment where an external magnetic field is applied, particularly at high temperatures, and a production method thereof are provided.The present disclosure presents a production method of a rare earth magnet, including preparing a coated magnetic powder, compression-molding the coated magnetic powder in a magnetic field to obtain a magnetic-field molded body, pressure-sintering the magnetic-field molded body to obtain a sintered body, and heat-treating the sintered body, and a rare earth magnet obtained by the method. D50 of the magnetic powder in the coated magnetic powder is 1.50 μm or more and 3.00 μm or less, the content ratio of the zinc component in the coated magnetic powder is 3 mass % or more and 15 mass % or less, and the heat treatment temperature is 350° C. or more and 410° C. or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.