Process for producing magnetic powder having high coercive force
US4321302A · kind A · utility
41Cited by
5References
5Claims
0Family size
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Key dates
| Filing date | Apr 24, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Apr 24, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic iron oxide powder having high coercive force is produced by dispersing a magnetic iron oxide comprising a silicon component and a phosphorus component in an aqueous solution of a cobalt ion and adding a base to the dispersion to be an alkaline condition and heat-treating the dispersion whereby the cobalt ion is adsorbed and diffused in the surface layer of the magnetic iron oxide. A zinc component can be also incorporated in the crystal. The silicon component and the phosphorus component are preferably incorporated in the crystalline structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.