W-containing R—Fe—B—Cu sintered magnet and quenching alloy
US10614938B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 13, 2019 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | May 13, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0293
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention discloses a W-containing R—Fe—B—Cu serial sintered magnet and quenching alloy. The sintered magnet contains an R2Fe14B-type main phase, the R being at least one rare earth element comprising Nd or Pr; the crystal grain boundary of the rare earth magnet contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for 2.0 vol %˜11.0 vol % of the sintered magnet. The sintered magnet uses a minor amount of W pinning crystal to segregate the migration of the pinned grain boundary in the crystal grain boundary to effectively prevent abnormal grain growth and obtain significant improvement. The crystal grain boundary of the quenching alloy contains a W-rich area above 0.004 at % and below 0.26 at %, and the W-rich area accounts for at least 50 vol % of the crystal grain boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.