Rare earth magnet and method for making same
US6527874B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Jul 10, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/058
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rapidly solidified alloy is produced by quenching and solidifying a melt of an alloy having a general formula represented by (Fe1-mTm)100-x-y-zQxRyMz where T denotes at least one kind of element selected from the group consisting of Co and Ni, Q denotes at least one kind of element selected from the group consisting of B and C, R denotes at least one kind of rare earth element, and M denotes at least one kind of element selected from the group consisting of Nb and Mo, and the mole fractions x, y, z, and m respectively satisfy 2≦x≦28 (atom %), 8≦y≦30 (atom %), 0.1 ≦z<1.0 (atom %), and 0≦m≦0.5 (atom %). The rapidly solidified alloy is then pulverized and sintered to manufacture a rare earth permanent magnet. The cooling rate is controlled to be in the range of 102 K/sec to 104 K/sec, so that the alloy structure is uniformly fine and the added element M is uniformly dispersed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.