High-performance NdFeB rare earth permanent magnet with composite main phase and manufacturing method thereof
US9863021B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 2015 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Nov 25, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A NdFeB rare earth permanent magnet with composite main phase and a manufacturing method thereof are provided. In the composite main phase, a PR2(Fe1-x-yCoxAly)14B main phase is the core, ZR2(Fe1-w-nCowAln)14B main phase surrounds a periphery of the PR2(Fe1-x-yCoxAly)14B main phase, and no grain boundary phase exists between ZR2(Fe1-w-nCowAln)14B main phase and the PR2(Fe1-x-yCoxAly)14B main phase, wherein ZR represents a group of rare earth elements in which a content of heavy rare earth is higher than an average content of heavy rare earth in the composite main phase, PR represents a group of rare earth elements in which a content of heavy rare earth is lower than an average content of heavy rare earth in the composite main phase. The manufacturing method includes steps of LR—Fe—B-Ma alloy melting, HR—Fe—B-Mb alloy melting, alloy hydrogen decrepitating, metal oxide micro-powder surface absorbing and powdering, magnetic field pressing, sintering and ageing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.