Hexaferrite materials
US5858265A · kind A · utility
5Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Jul 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/70678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Barium, strontium and/or rare earth metal hexaferrite powder of low coercivity can be produced by subjecting a barium, strontium and/or rare earth metal hexaferrite powder to carburising, nitriding, carbonitriding, hydriding or carbohydriding conditions without undue loss of saturation magnetisation. High coercivity powder can be produced by calcining the low coercivity powder (FIG. 1). High remanence and high saturation magnetisation powder can be produced by mechanically alloying of a Sr--, Ba and/or rare earth metal hexaferrite powder with iron powder (FIG. 12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.