R-T-B based sintered magnet
US9773599B2 · kind B2 · utility
3Cited by
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6Claims
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Key dates
| Filing date | Feb 13, 2013 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Mar 30, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2999/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1):0.4<(O/R)<0.7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.