Anisotropic neodymium-iron-boron powder with high coercivity
US4842656A · kind A · utility
26Cited by
1References
3Claims
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Key dates
| Filing date | Jun 12, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Jun 12, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0571
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Magnetically anisotropic powder having high coercivity and containing the magnetic phase Nd.sub.2 Fe.sub.14 B is produced by melt spinning a composition of these elements to form amorphous or extremely finely crystalline particles which are hot worked to produce grains containing the above phase and having dimensions in the range of about 20 to 500 nanometers. When the hot worked body is comminuted to powder, the resultant particles are magnetically anisotropic and have appreciable coercivity at room temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.