Process of preparing ferrite powders
US4279763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1980 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Jun 5, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/2683
- 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 comprises the preparation of a mixture of iron oxides and carbonates of Ba, Sr and/or Pb, adding to said mixture one or more 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.