METHOD FOR PRODUCING MANGANESE-ZINC FERRITE CORE AND MANGANESE-ZINC FERRITE CORE

Title:

METHOD FOR PRODUCING MANGANESE-ZINC FERRITE CORE AND MANGANESE-ZINC FERRITE CORE

Document Type and Number:

WIPO Patent Application WO/2000/031000

Kind Code:

A1

Abstract:

A method for producing a manganese-zinc ferrite core which comprises forming manganese-zinc ferrite into a predetermined core shape, firing the resultant core in a firing atmosphere having an oxygen content adjusted with carbon dioxide and steam, and then subjecting the fired product to a rapid cooling at a rate of 350 to 850°C/hr; and a manganese-zinc ferrite core produced by using the method. This method can be used for producing a manganese-zinc ferrite core having a high surface electric resistance and also a low magnetic core loss, without introduction of nitrogen gas and with firing for a short time.

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Inventors:

KINOSHITA YUKIHARU (JP)
TAKAHASHI HIROYASU (JP)
SAWAI JUN (JP)

Application Number:

PCT/JP1999/006532

Publication Date:

June 02, 2000

Filing Date:

November 24, 1999

Export Citation:

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Assignee:

TDK CORP (JP)
KINOSHITA YUKIHARU (JP)
TAKAHASHI HIROYASU (JP)
SAWAI JUN (JP)

International Classes:

H01F1/34; C04B35/26; C04B35/38; C04B35/64; H01F41/02; (IPC1-7): C04B35/38

Foreign References:

JPH0221187A	1990-01-24
US4104549A	1978-08-01
JPH04354304A	1992-12-08
JPH06295812A	1994-10-21
JPH1022113A	1998-01-23

Other References: