Ferrite core and producing method thereof

A technology of ferrite core and core loss, which is applied in the manufacture of inductors/transformers/magnets, inductors with magnetic cores, chemical instruments and methods, etc., and can solve problems such as difficulty in effectively preventing magnetic deterioration

Inactive Publication Date: 2003-03-19
TDK CORPARATION
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  • Abstract
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Problems solved by technology

In addition, rich in Fe 2 o 3 The composition of is effective for obtaining a high saturation magnetic flux density, however, in the examples of the same publication, in the unexperimented Fe-rich 2 o 3 Within the range, it is difficult to effectively prevent the magnetic deterioration at high temperature only by controlling the auxiliary components (additives) within the specified range as in the same bulletin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] Hereinafter, the present invention will be described in further detail with reference to specific examples.

[0092] The ferrite core samples shown in Table 1 were produced in the following procedure.

[0093] First, raw materials of the main component were prepared according to the components shown in Table 1, and after wet mixing these, they were dried with a spray drier, and calcined at 900° C. for 2 hours.

[0094]Next, the calcined product of the main component raw material and the auxiliary component raw material are mixed. For auxiliary component raw materials, SiO 2 , CaCO 3 , Nb 2 o 5 . Addition amount of auxiliary component raw materials, in the final component (ferrite core component), SiO 2 content of 0.010% by mass, CaO content of 0.060% by mass, Nb 2 o 5 The content is 0.020% by mass.

[0095] The auxiliary components are added to the calcined raw material of the main raw material, and mixed while pulverizing. The average particle diameter of the...

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Abstract

To provide a soft ferrite which has a high saturation magnetic flux density of Bs at a high temperature of 100 DEG C or higher, especially at a temperature of 150 DEG C or so and deteriorates its magnetic properties less (even if sacrificing its low power loss property to some extent) at the above high temperature, especially deteriorates its core loss less, and is superior in magnetic stability. The major composition of ferrite core contains 56 to 57 mol% iron oxide in terms of Fe2O3, 5 to 10 mol% zinc oxide in terms of ZnO, 3 to 6 mol% in terms of NiO, and the residual mol% manganese oxide in terms of (MnO). When the major composition is expressed by: (Zn<2+>a, Ni<2+>b, Mn<2+>c, Mn<3+>d, Fe<2+>e, Fe<3+>f)O4+delta equation (1) (in the equation (1), a+b+c+d+e+f=3, and the relationship delta=a+b+c+(3/2)d+e+(3/2)f-4) the delta value in the equation (1) is in the range 0 <= delta <= 0.001.

Description

technical field [0001] The present invention relates to a method of manufacturing ferrite cores used at high temperatures, such as those suitable for use in transformers and choke coils, and in particular, to high saturation magnetic flux densities at temperatures above 100°C, especially around 150°C , and a ferrite core with less deterioration during high-temperature storage and good magnetic stability, and a manufacturing method thereof. Background technique [0002] Soft ferrite used as core material requires high saturation flux density and low power loss. Examples of applications of such soft ferrite include ferrite cores used in transformers and choke coils in DC-DC converters of EVs (electric vehicles) and HEVs (hybrid electric vehicles), Or set ferrite cores used at high temperatures near car engines. [0003] The required characteristics of soft ferrite used at such high temperatures are small magnetic deterioration at high temperatures, good durability, no signif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C01G49/00C04B35/26H01F1/34H01F17/04H01F41/02
CPCH01F17/04C04B2235/3418C04B2235/3239H01F1/344C04B2235/6583C04B2235/3265C04B2235/3284C04B35/265C04B2235/3208C04B2235/3251C04B2235/604C04B2235/3279C04B2235/6584C04B2235/83C04B2235/3262C04B2235/3256H01F41/0246C04B2235/3244C04B2235/3298H01F1/34
Inventor 石田茂敏渡边雅彦安原克志
Owner TDK CORPARATION
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