Magnetically anisotropic bond magnet, magnetic powder for the magnet and manufacturing method of the powder
US4921553A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1987 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Mar 17, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0578
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Magnetically anisotripic powder and resin-bonded magnets made therefrom have "flattened" crystal grains of an R-TM-B-M system alloy with preferably (c)/(a) greater than 2, where (c) is the grain size perpendicular to the C-axis and (a) the grain size parallel to the C-axis. The "flattened" grains are produced by plastically deforming a green compact of flakes formed by rapidly-quenching an alloy melt, and then crushing the plastically deformed body. In the allow system, R is at least one of the rare earth elements including Y, TM is Fe or Fe a part of which has been substituted with Co, B is boron, and M is an additive selected from Si, Al, Nb, Zr, P and C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.