Method of producing cast magnetic soft ferrite
AssigneeDaido Tokushuko Kabushiki Kaisha
InventorsMitsuo Sugimoto, Akihiko Saito
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Abstract
A method of producing magnetic soft ferrite of the general formula: M.sub.x Zn.sub.1-x O.Fe.sub.2 O.sub.3 (M stands for one or more of Cu, Mn, Ni, Fe, Co and Mg; and X is in the range of 0.4-0.7) by melting and casting is disclosed. Melting is carried out under controlling evaporation of Zn-component in the material of the ferrite by disposing Zn-source around the material, sealing up the melting chamber as tight as possible, or under a pressurized gas atmosphere so as to obtain the product having uniform and precise composition.
Claims3
A method of producing magnetic soft ferrite expressed by the general formula:
- M.sub.x Zn.sub.1-x O Fe.sub.2 O.sub.3 wherein M represents one or more of the materials selected from Cu, Mn, Ni, Fe, Co and Mg;
- and X is in the composition range of 0.4-0.7, by melting and casting, comprising the processes of heating a material consisting of the compound with the above formula or a mixture of the component oxides corresponding to the above composition to a temperature of 1500.degree.-1900.degree. C. to melt;
- while disposing a Zn supply source consisting of Zn or a Zn compound around the above mentioned material to allow existence of a surrounding gas containing Zn so as to suppress evaporation of Zn in the molten material, the surrounding gas containing Zn being at a pressure of 1-3.1 kg/cm.sup.2 ;
- and solidifying the melt by casting the melt into a mold having a desired shape preheated to a temperature of 200.degree.-800.degree. C. and cooling under a cooling rate of 300.degree.-1800.degree. C./hr.
Dependencies are inferred from the claim text.