Ferrite sintered body and method of manufacturing same
AssigneeHitachi Metals, Ltd.
InventorTomotsugu Kato
Life of this patent
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Abstract
The ferrite sintered body of hexagonal Z-type ferrite contains 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, the remainder being Fe2O3 as its main components and also contains 0.05% to 1.0% by mass of Li, based on the main components, in terms of Li2CO3 and 0.05% to 0.5% by mass of Si, based on the main components, in terms of SiO2. Further, the rate of a spinel-type ferrite phase to entire phases including a Z-type ferrite phase and the spinel-type ferrite phase is 5% or less in terms of an area ratio in the cross section of the sintered body.
Claims18
A ferrite sintered body of hexagonal Z-type ferrite comprising:
- 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, and the remainder being Fe2O3 as its main components;
- 0.05% to 1.0% by mass of Li, based on said main components, in terms of Li2CO3;
- and
- 0.05% to 0.5% by mass of Si, based on said main components, in terms of SiO2.
A method of manufacturing a ferrite sintered body comprising:
- a calcination process to calcine mixed material powder;
- a powder pulverizing process to pulverize calcined powder obtained in said calcined process;
- a forming process to form pulverized powder obtained in said powder pulverizing process;
- and
- a sintering process to sinter a green compacts obtained in said forming process so that a sintered body of hexagonal Z-type ferrite is obtained;
- wherein said ferrite sintered body contains 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, the remainder being Fe2O3 as its main components and contains 0.05% to 1.0% by mass of Li, based on said main components, in terms of Li2CO3 and 0.05% to 0.5% by mass of Si, based on said main components, in terms of SiO2 and wherein said calcination process is performed at temperatures of 950° C. to 1150° C.
Dependencies are inferred from the claim text.