Process of preparing ferrite powders

Details Process of preparing ferrite powders Process of preparing ferrite powders

1980-04-09

1981-03-31

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 626, 252 6263, 423594, C04B 3526

Patent

active

042591970

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.

REFERENCES:
patent: 3716630 (1973-02-01), Shirk
patent: 3897355 (1975-07-01), Arend et al.

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