Process for producing ferromagnetic metal fine particles
US4804561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Oct 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for producing ferromagnetic metal fine particles having superior magnetic characteristics, particularly, high saturation magnetization, well-balanced coercive force, having prevented sintering of particles between one another and also having superior dispersibility each particle, superior dispersibility of magnetic paints and improved corrosion resistance is provided, which process comprises adhering a compound of a metal such as Ni, etc. onto the surface of iron .alpha.-oxyhydroxide particles in water, depositing a silicon compound and an aluminum compound onto the resulting particles in alkaline water, filtering off and drying the resulting iron .alpha.-oxyhydroxide, calcining the particles in a non-reducing gas atmosphere and reducing the particles on heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.