Feedstock and heterogeneous structure for tough rare earth permanent magnets and production therefor
US12205762B2 · kind B2 · utility
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Key dates
| Filing date | Oct 15, 2018 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | Nov 11, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/086
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
New types of particle feedstocks and heterogeneous grain structures are provided for rare earth permanent magnets (REPMs) and their production in a manner to significantly enhance toughness of the magnet with little or no sacrifice in the hard magnetic properties. The novel tough REPMs made from the feedstock have heterogeneous grain structures, such as bi-modal, tri-modal, multi-modal, laminated, gridded, gradient fine/coarse grain structures, or other microstructural heterogeneity and configurations, without changing the chemical compositions of magnets.
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