Method of manufacturing rare earth magnet
US10242795B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2014 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Jan 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A manufacturing method includes: manufacturing a sintered compact having a composition of (Rl)x(Rh)yTzBsMt; manufacturing a precursor by performing hot deformation processing on the sintered compact; and manufacturing a rare earth magnet by performing an aging treatment on the precursor in a temperature range of 450° C. to 700° C. In this method, a main phase thereof is formed of a (RlRh)2T14B phase. A content of a (RlRh)1.1T4B4 phase in a grain boundary phase thereof is more than 0 mass % and 50 mass % or less. Rl represents a light rare earth element. Rh represents a heavy rare earth element. T represents a transition metal. M represents at least one of Ga, Al, Cu, and Co. x, y, z, s, and t are percentages by mass of Rl, Rh, T, B, and M. x, y, z, s, and t are expressed by the following expressions: 27≤x≤44, 0≤y≤10, z=100−x−y−s−t, 0.75≤s≤3.4, 0≤t≤3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.