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US 6,660,189 B2Granted
Production process of MN-Zn ferrite
AssigneeMinebea Co., Ltd.
InventorsOsamu Kobayashi, Osamu Yamada, Kiyoshi Ito
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Abstract
The present invention provides a production process of a Mn—Zn ferrite that enables wastes of sintered cores to be recycled without serious difficulties in sintering. The production process comprises recycling a powder obtained by milling a sintered Mn—Zn ferrite, thereby obtaining a sintered core having a component composition including 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, 1.0 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn2O3 and a remainder MnO.
Claims2
A production process of a Mn—Zn ferrite, comprising the steps of:
- milling a sintered core of Mn—Zn ferrite for recycling;
- subjecting a recycled powder to a component adjustment so as to have a composition of 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, 1.0 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn2O3 and a remainder being MnO;
- pressing a mixed powder subjected to the component adjustment;
- and sintering a green compact obtained by pressing the mixed powder.
1 more element
Dependencies are inferred from the claim text.