The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2019
Filed:
Aug. 31, 2015
Hitachi Metals, Ltd., Tokyo, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
Provided are: a MnZn-based ferrite which allows to have a low magnetic core loss and to suppress a time-dependent change of magnetic property under a high-temperature environment by a control of ambient oxygen concentration and an increase of the magnetic core loss, and a method for manufacturing the same. The MnZn-based ferrite is characterized in that Fe ranges from 53.25 mol % or more to 54.00 mol % or less on the basis of FeO, Zn ranges from 2.50 mol % or more to 8.50 mol % or less on the basis of ZnO and Mn is the remainder on the basis of MnO, Si ranges from more than 0.001 mass % to less than 0.02 mass % on the basis of SiO, Ca ranges from more than 0.04 mass % to less than 0.4 mass % on the basis of CaCO, Co is less than 0.5 mass % on the basis of CoO, Bi is less than 0.05 mass % on the basis of BiO, Ta is less than 0.05 mass % on the basis of TaO, Nb is less than 0.05 mass % on the basis of NbO, Ti is less than 0.3 mass % on the basis of TiO, and Sn is less than 0.3 mass % on the basis of SnO, and note that the converted total amount of TaOand NbOis less than 0.05 mass % and the converted total amount of TiOand SnOis less than 0.3 mass %.