MNZN FERRITE CORE AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2010/087514

A1

Disclosed is an MnZn ferrite core comprising basic components, secondary components, and unavoidable impurities. To the basic components comprising: iron oxide (as Fe2O3): 51.0-54.5 mol%, zinc oxide (as ZnO): 8.0-12.0 mol% and manganese oxide (as MnO): remainder, are added silicon oxide (as SiO2): 50-400 mass ppm and calcium oxide (as CaO): 50-4000 mass ppm as secondary components, and in the unavoidable impurities, phosphorus, boron, sulfur and chlorine are respectively kept to: less than 3 mass ppm; less than 3 mass ppm; less than 5 mass ppm; and less than 10 ppm. The ratio of the measured specific surface area to the ideal specific surface area of the MnZn ferrite core satisfies formula (1). Measured specific surface area/ideal specific surface area < 1500 --- (1) Here, the measured specific surface area is the specific surface area (m2/g) found with the BET method (multipoint method) in JIS Z 8830 (2001), and the ideal specific surface area is the specific surface area (m2/g) calculated from the core dimensions and mass, assuming an ideal state with no voids in the core. The MnZn ferrite core achieves higher incremental permeability (µΔ) at high temperatures in a high magnetic field than conventionally. The core has excellent characteristics, namely, that the incremental permeability (µΔ) when a direct-current magnetic field of 80 A/m is applied is always 400 or greater in a broad temperature range of 0-85°C, and the incremental permeability (µΔ) at 65°C is 700 or greater.

JP3381947	[Title of Invention] Ferrite for power supply and magnetic core for power supply
JPH07320925	MANUFACTURE OF LOW-LOSS OXIDE MAGNETIC MATERIAL
JP2855275	[Title of Invention] Low Loss Oxide Magnetic Material

YOSHIDA HIROFUMI (JP)
NAKAMURA YUKIKO (JP)
GOTO SATOSHI (JP)

PCT/JP2010/051649

August 05, 2010

January 29, 2010

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JFE CHEMICAL CORP (JP)
YOSHIDA HIROFUMI (JP)
NAKAMURA YUKIKO (JP)
GOTO SATOSHI (JP)

C04B35/38; H01F1/34; H01F3/08; H01F41/02

JP2006151701A	2006-06-15
JP2008143744A	2008-06-26
JP2006273673A	2006-10-12
JP2005272229A	2005-10-06
JP2002128570A	2002-05-09
JP2005109356A	2005-04-21
JP2004196632A	2004-07-15
JPH07297020A	1995-11-10
JP2006213532A	2006-08-17
JP2001064076A	2001-03-13
JP2005179092A	2005-07-07
JP2007197246A	2007-08-09
JP2008013135A	2008-01-24

JIS Z, 1993, pages 8841
JIS Z, 2001, pages 8830

OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)

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