Mn-Zn ferrite and production process thereof
AssigneeMinebea Co., Ltd.
InventorsOsamu Kobayashi, Osamu Yamada, Kiyoshi Ito
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Abstract
The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 Ωm order and having a high initial permeability of 3000 or more at 100 kHz and 100 or more at 10 MHz. The main components of the Mn—Zn ferrite are 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to 1.00 mol % Mn2O3 and the remainder MnO. The Mn—Zn ferrite is enabled to be used in a wide frequency region from 100 kHz to 10 MHz by limiting Fe2O3 content to less than 50 mol % that is the stoichiometric composition and inhibiting formation of Mn2O3.
Claims8
A Mn—Zn ferrite, containing as main components 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to less than 1.00 mol % Mn2O3 and a remainder MnO, and as additive at least one of 0.010 to 0.200 mass % V2O5, 0.005 to 0.100 mass % Bi2O3, 0.005 to 0.100 mass % In2O3, 0.005 to 0.100 mass % PbO, 0.001 to 0.100 % mas MoO3 and 0.001 to 0.100 mass % WO3.
A Mn—Zn ferrite consisting essentially of 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to less than 0.90 mol % Mn2O3 and a remainder MnO.
A Mn—Zn ferrite consisting essentially of main components including 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to less than 0.90 mol % Mn2O3 and a remainder MnO, and as additive at least one of 0.010 to 0.200 mass % V2O5, 0.005 to 0.100 mass % Bi2O3, 0.005 to 0.100 mass % In2O3, 0.005 to 0.100 mass % PbO, 0.001 to 0.100 mass % MoO3 and 0.001 to 0.100 mass % WO3.
A Mn—Zn ferrite, containing as main components 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to less than 0.90 mol % Mn2O3 and a remainder MnO.
Dependencies are inferred from the claim text.