Method for improving magnetic properties of cerium-yttrium-rich rare earth permanent magnet
US12347591B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2022 |
| Grant date | Jul 1, 2025 |
| Priority date | — |
| Expiry date | Apr 25, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0253
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for improving magnetic properties of a Ce—Y-rich rare earth permanent magnet is provided, and the Ce—Y-rich rare earth permanent magnet is subjected to pressurized heat treatment to improve magnetic properties. The method includes: preparing a pristine magnet through a sintering process; and placing the pristine magnet into a pressurized heat treatment device and performing pressurized heat treatment under the protection of an argon atmosphere. By regulating parameters such as pressure, temperature and holding time in the heat treatment process, element diffusion in the Ce—Y-rich permanent magnet is promoted, and coercivity, remanence, magnetic energy product and temperature stability of the Ce—Y-rich permanent magnet are improved. The method has advantages of a simple process with low energy consumption, a substitution amount of rare earths Ce—Y up to 90 wt % while having excellent magnetic performance, so that a way for efficient utilization of high-abundance rare earths Ce and Y is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.