Mn-Zn-BASED FERRITE, MAGNETIC CORE FOR TRANSFORMER AND TRANSFORMER

Title:

Mn-Zn-BASED FERRITE, MAGNETIC CORE FOR TRANSFORMER AND TRANSFORMER

Document Type and Number:

Japanese Patent JP3889354

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide an Mn-Zn-based ferrite which is excellent in a DC superimposing property as a magnetic core used for a transformer for transmission and the like at a wide temperature zone and whose magnetic permeability is high, the magnetic core used for the transformer and the transformer.
SOLUTION: The main components of the Mn-Zn-based ferrite are iron oxide of 51-54 mol% in terms of Fe2O3, zinc oxide of 14-21 mol% in terms of ZnO and the remainder of manganese oxide. The content of cobalt oxide in terms of CoO denoted as α ppm to the main components of 100 wt.% satisfies the expression : Y1≤α≤Y2 (1), wherein Y1=(-0.13B2+1.5B-15.6A+850)/(0.0003B+0.0098)-233 (2); Y2=(-0.40B2+4.6B-46.7A+2,546)/(0.0003B+0.0098)+1,074 (3); CoO>0 ppm; A=Fe2O3 (mol%) and B=ZnO (mol%) in Y1 and Y2.

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Inventors:

Masahiko Watanabe
Katsushi Yasuhara

Application Number:

JP2002369992A

Publication Date:

March 07, 2007

Filing Date:

December 20, 2002

Export Citation:

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Assignee:

tdk Corporation

International Classes:

C04B35/38; C04B35/26; H01F1/34; H01F1/36; H01F27/255; H01F17/04; H01F19/08; H01F27/32; (IPC1-7): C04B35/38; H01F1/34; H01F1/36; H01F27/255

Domestic Patent References:

JP11302069A
JP9148115A
JP59050072A
JP2000182816A
JP2000277317A
JP2001110624A
JP11135317A
JP9002866A

Attorney, Agent or Firm:

Hitoshi Maeda
Shingo Nishide
Koichiro Okura

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