Sintered magnet
US9997284B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2013 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Nov 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sintered magnet of a preferred embodiment has a composition comprising: R (R is a rare earth element that must contain any one of Nd and Pr.): 29.5 to 33.0 mass %; B: 0.7 to 0.95 mass %; Al: 0.03 to 0.6 mass %; Cu: 0.01 to 1.5 mass %; Co: 3.0 mass % or less (provided that 0 mass % is not included.); Ga: 0.1 to 1.0 mass %; C: 0.05 to 0.3 mass %; O: 0.03 to 0.4 mass %; and Fe and other elements: a balance, and wherein a content of heavy rare earth elements in total is 1.0 mass % or less, and wherein the following relations are satisfied: 0.29<[B]/([Nd]+[Pr])<0.40 and 0.07<([Ga]+[C])/[B]<0.60, where [Nd], [Pr], [B], [C] and [Ga] represent the numbers of atoms of Nd, Pr, B, C and Ga, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.