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Title:
ROD-SHAPED MNZN FERRITE CORE AND METHOD FOR PRODUCING SAME, AND ANTENNA
Document Type and Number:
WIPO Patent Application WO/2018/189967
Kind Code:
A1
Abstract:
A rod-shaped MnZn ferrite core containing, as basic components, iron: 51.5-54.5 mol% in terms of Fe2O3, zinc: 10.0-17.0 mol% in terms of ZnO, and manganese: remainder and as secondary components SiO2: 50-300 mass ppm, CaO: 100-1300 mass ppm, and Nb2O5: 100-400 mass ppm, wherein both high magnetic permeability with an initial magnetic permeability μi at 23°C, 100 kHz of 1800 or higher and high strength with an incidence of core having strength of less than 100 MPa of 4% or less when the three-point bending strength is measured at n = 50 are realized by making the sintered density of the MnZn ferrite core be 4.85 g/cm3 or higher and making the average value of the maximum trough depth of the contour curve at n = 50 to be 17 μm or less in a surface quality observation based on JIS B 0601.

Inventors:
YOSHIDA Hirofumi (17-4 Kuramae 2-chom, Taito-ku Tokyo 51, 〒1110051, JP)
NAKAMURA Yukiko (17-4 Kuramae 2-chom, Taito-ku Tokyo 51, 〒1110051, JP)
Application Number:
JP2017/047118
Publication Date:
October 18, 2018
Filing Date:
December 27, 2017
Export Citation:
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Assignee:
JFE CHEMICAL CORPORATION (17-4, Kuramae 2-chome Taito-ku Tokyo, 51, 〒1110051, JP)
International Classes:
C04B35/38; C01G49/00; H01F1/34; H01F1/36; H01F3/08
Foreign References:
JP2006044971A2006-02-16
JPH08337465A1996-12-24
JP2010173899A2010-08-12
JP2010195596A2010-09-09
JPH10270232A1998-10-09
JP2006206355A2006-08-10
Attorney, Agent or Firm:
SUGIMURA Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigasek, Chiyoda-ku Tokyo 13, 〒1000013, JP)
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