Process of preparing ferrite powders
US4259197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1980 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Apr 9, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/113
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a process for preparing ferrite powders of Ba, Sr, and/or Pb intended to be incorporated in an elastomeric, thermoplastic, or thermosettable binder for manufacturing flexible or rigid permanent magnets. The process consists of starting out with a mixture of.alpha. Fe.sub.2 O.sub.3 iron oxides and carbonates of Ba, Sr and/or Pb, adding to said mixture one or more alkaline and/or alkaline earth halides in a total proportion of 0.5 to 15% of the total weight of the mixture, and one or more oxygenated boron compounds, more particularly, alkaline and/or alkaline earth borates, in a proportion of 0.2 to 7%, and calcining said mixture between 850.degree. and 1100.degree. C. for at least 15 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.