Sintered rare earth magnet, method of producing the same, and rotating machine
US9177705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2012 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | May 25, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sintered rare earth magnet rotating machine and method improve temperature properties and strength having an excellent corrosion resistance. The sintered rare earth magnet includes at least a main phase composed of R2T14B (R represents at least one rare earth element of Nd, Pr or both and T represents at least one transition metal element including Fe or Fe and Co) compound and a grain boundary phase containing a higher proportion of R than the main phase, wherein the main phase includes a heavy rare earth element (one of Dy, Tb or both), at least part of main phase grains of the main phase included in the sintered rare earth magnet includes at least the following regions, low, high and intermediate concentration regions. These regions exist in order of low, high, and intermediate concentration regions, from low concentration region towards the grain boundary phase in the main phase grains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.