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MnZnLi system ferrite

A technology of ferrite and iron oxide, applied in the field of MnZnLi ferrite, to achieve excellent temperature dependence, high saturation magnetic flux density characteristics, and increase production

Active Publication Date: 2012-12-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Fe in this prior art 2 o 3 The amount is less than the chemical theoretical amount

Method used

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  • MnZnLi system ferrite

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Experimental program
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Effect test

Embodiment I

[0065] Hereinafter, the present invention will be described in further detail by citing specific examples. As shown in the sample number I-3 of the following Table 1, the main component raw materials forming the main component are weighed so that the iron oxide in the final component is Fe 2 o 3 56.0 mol% in terms of MnO, 37.1 mol% in terms of MnO, 6.0 mol% in terms of ZnO, and 6.0 mol% in terms of lithium oxide as LiO 0.5 Converted to 0.9 mol%. In addition, using LiFeO 2 As Li raw material, consider LiFeO 2 Adjust the Fe composition by the amount of Fe in it.

[0066] A wet ball mill was used to wet mix the weighed raw materials for 16 hours and then dry them.

[0067] Next, the dried product was calcined at 900° C. for 3 hours in the air, and then pulverized.

[0068] CoO powder as an auxiliary component raw material was added to the obtained calcined powder, mixed and pulverized, and then a binder was added to the obtained mixture powder, granulated and then molded to...

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Abstract

The invention provides a novel type MnZnLi system ferrite, which includes a temperature dependence performance with a highly saturated magnetic flux density and an excellent reduced magnetic loss (magnet core waste) value, thereby realizing improvement of a bending strength, and further increasing product yield, and producing magnet cores with excellent thermal-shock resistance. The main ingredients of the MnZnLi system ferrite contain 54.0-58 mol% of iron-oxide calculated from Fe2O3, 3.0-10.0 mol% of zinc oxide calculated from ZnO, 0.3-1.5mol% of lithium oxide calculated from LiO0.5, and therest is manganese oxide calculated from MnO, and the accessory ingredient contains Co 500-2000 ppm calculated from CoO relative to the main ingredient.

Description

technical field [0001] The present invention relates to a MnZnLi-based ferrite, more specifically, a MnZnLi-based ferrite used for magnetic cores of power transformers such as switching power supplies, and particularly relates to achieving magnetic loss (magnetic core) in a wide temperature range Loss) is small, and the strength of the sintered body, especially the MnZnLi-based ferrite with improved flexural strength (bending strength). Background technique [0002] In recent years, electronic equipment has rapidly developed toward miniaturization and higher output power. Accompanying this is the development of high integration and high-speed processing of various components, which requires the power supply line for power supply to increase the current. Components such as transformers and choke coils are also required to be driven at high currents. In addition, due to the high temperature of the environment in which automobiles are used and the temperature rise caused by he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26H01F1/34
CPCC01G49/0018C04B35/265C04B2235/3203C04B2235/3262C04B2235/3284H01F1/344H01F2003/106
Inventor 中畑功李小龙黑田朋史车声雷森健太郎青木卓也
Owner TDK CORPARATION