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Ferrite material

A technology of ferrite material and sintered body, which is applied in the direction of magnetism of inorganic materials, can solve the problems of inability to use transformers, difficult to provide, and the size of magnetic core loss is not considered, and achieves the effect of high saturation magnetic flux density and low magnetic core loss.

Active Publication Date: 2007-09-19
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the ferrite proposed in Patent Document 1 is characterized in that the minimum temperature of the core loss exceeds 150°C, and no consideration is given regarding the magnitude of the core loss at the driving temperature
[0007] In addition, regarding the ferrite proposed in Patent Document 2, by adding Ni and Li, a high saturation magnetic flux density above 480mT and a minimum core loss of 1300kW / m can be obtained 3 The lower loss is lower, but considering the efficiency of transformers and coils, materials with lower loss are required, and NiO is a relatively expensive material, and it is difficult to provide it to the market cheaply.
[0008] As for the ferrite proposed in Patent Document 3, only materials with a saturation flux density lower than 440mT at 100°C can be obtained, and cannot be used for transformers or choke coils driven at higher flux densities

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0044] Hereinafter, the present invention will be described based on specific examples.

[0045] Use Fe 2 o 3 powder, MnO powder and ZnO powder as raw materials for the main component, using Li 2 CO 3 Powder, SiO 2 Powder, CaCO 3 Powder, Nb 2 o 5 Powder and Ta 2 o 5 Powder is used as a raw material for sub-components. The composition of the main component and the composition of the subcomponent are shown in Table 1. These powders were wet-mixed, and then calcined at 900° C. for 3 hours in the air.

[0046] A binder is added to the obtained mixture, pelletized, and molded to obtain a ring-shaped molded body.

[0047] By firing the obtained molded body at a temperature of 1350°C (stable part time: 2 hours, stable part oxygen partial pressure: 5%) under the condition of controlling the oxygen partial pressure, the ring-shaped ferrite body magnetic core. The dimensions of this magnetic core are 20 mm in outer diameter, 10 mm in inner diameter, and 5 mm in thickness. ...

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Abstract

It is an object to provide a ferrite material which has a higher saturation magnetic flux density and low core loss, both at 100 DEG C. The ferrite material is composed of a sintered body containing Fe, Mn and Zn as main constituents at x, y and z % by mol in terms of Fe2O3, MnO and ZnO, respectively, and containing Li as an additive at v % by weight in terms of Li2CO3 based on the main constituents, wherein x=55.7 to 60, z=3 to 8.5, y=100-x-z, v=0.3 to 0.8, and x1<=x<=x2 (x1=52.9-0.1z+8.5v and x2=54.4-0.1z+8.5v).

Description

technical field [0001] The present invention relates to a ferrite material with high saturation magnetic flux density and low core loss in a high temperature region around 100°C. Background technique [0002] In recent years, electronic equipment has developed towards miniaturization and high output power. Accompanying this is the development of high integration and high-speed processing of various components, and the demand for high current of power supply transformers for power supply. Even components such as transformers and choke coils are required to be driven at high currents. In addition, stable driving at around 100°C is required from the viewpoint of the temperature increase in the operating environment of automobiles and the temperature rise caused by heat dissipation during driving. [0003] In order to be suitable for driving with a large current, ferrite cores constituting transformers, choke coils, and the like are required to have a high saturation magnetic f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/10
CPCH01F1/36C04B35/2658C04B2235/3203C04B2235/3208C04B2235/3251C04B2235/3262C04B2235/3284C04B2235/3418C04B2235/6584H01F1/22
Inventor 黑田朋史中畑功渡边雅彦古川正仁长谷川治青木卓也
Owner TDK CORPARATION
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