Permanent magnetic material and bond magnet
US5968289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Dec 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/059
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnetic material of the present invention has a TbCu.sub.7 phase as the principal phase and high magnetic characteristics with an extremely small variation among the values. This permanent magnetic material is expressed in a general formula: EQU R1.sub.X R2.sub.y A.sub.z O.sub.u B.sub.v M.sub.100-x-y-z-u-v wherein R1 is at least one element selected from the rare earth elements including Y, R2 is at least one element selected from Zr, Hf and Sc, A is at least one element selected from hydrogen, nitrogen, carbon and phosphorus, M is at least one element selected from Fe and Co, x, y, z, u and v are atomic percent individually defined as 2.ltoreq.x, 0.01.ltoreq.y, 4.ltoreq.x+y.ltoreq.20, 0.001.ltoreq.z.ltoreq.10, 0.01.ltoreq.u.ltoreq.2, 0<v.ltoreq.10, and a principal phase has a TbCu.sub.7 crystal structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.