Stress-resistant nickel zinc ferrite with initial permeability of 120, and preparation method of stress-resistant nickel zinc ferrite

A nickel-zinc ferrite, anti-stress technology, applied in the field of stress-resistant nickel-zinc ferrite and its preparation, can solve the problem of nickel-zinc ferrite core inductance drop and other problems

Active Publication Date: 2012-07-25
TDG HLDG CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Power inductors often require nickel-zinc ferrite cores to be resin-encapsulated after winding. Resin encapsulation often produces stress on the nickel-zinc ferrite core, and the stress will cause the inductance of the nickel-zinc ferrite core to drop

Method used

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  • Stress-resistant nickel zinc ferrite with initial permeability of 120, and preparation method of stress-resistant nickel zinc ferrite
  • Stress-resistant nickel zinc ferrite with initial permeability of 120, and preparation method of stress-resistant nickel zinc ferrite
  • Stress-resistant nickel zinc ferrite with initial permeability of 120, and preparation method of stress-resistant nickel zinc ferrite

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Embodiment Construction

[0033] The present invention will be described below based on specific examples, but the present invention is not limited to these examples.

[0034]The stress-resistant nickel-zinc ferrite of the present invention is manufactured by a traditional oxide method, and the specific steps are as follows:

[0035] (1) Mixing: perform dry mixing according to the ratio of the main components described in Table 1 (Example and Comparative Example), and the mixing time is 60 to 90 minutes;

[0036] (2) Pre-burning: pre-fire the mixed materials in a pusher kiln, the pre-fire temperature is controlled at 900±20°C, and the pre-fire time is 240~300 minutes;

[0037] (3) Grinding: Add auxiliary components to the main component calcined material obtained in the previous step of calcining according to Table 1 (Example and Comparative Example) and then perform wet grinding. The grinding time is 60 to 100 minutes. After grinding, the slurry particles The diameter is controlled at 1.6~2.0μm;

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Abstract

The invention relates to a stress-resistant nickel zinc ferrite which has the initial permeability of 120 and is applicable to a power inductor and a preparation method of the stress-resistant nickel zinc ferrite. The stress-resistant nickel zinc ferrite comprises the main components based on respective reference substance: 46.5-50mol% of ferric oxide (Fe2O3), 20-25mol% of nickel oxide (NiO), 20-25mol% of zinc oxide (ZnO) and 9-12mol% of copper oxide (CuO); and the nickel zinc ferrite comprises the accessory ingredient by respective reference substance: 0.1-0.3wt% of calcium carbonate (CaCO3), 0.035-0.10wt% of cobalt oxide (Co2O3), 0.05-0.45wt% of bismuth oxide (Bi2O3), 0.1-1.0wt% of talcum powder and 0.1-1.0wt% of mica powder. The stress-resistant nickel zinc ferrite is prepared by an oxide method and is sintered under a certain condition. After sintering, the product has the crystallized grain size of 20-30mu m, has obvious crystal boundary, and has the characteristic of less inductance change under the stress action, thus meeting the requirement of the power inductor needed to be packaged by resin on the stress resistance of the ferrite material.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a stress-resistant nickel-zinc ferrite with an initial magnetic permeability of 120 and a preparation method thereof. Background technique [0002] Soft ferrite mainly includes two series of manganese-zinc and nickel-zinc ferrite materials, which are mainly used in the fields of computers, communications, power supplies and consumer electronics products, and are the basic functional materials in the electronics industry. Compared with manganese-zinc ferrite, nickel-zinc ferrite has the characteristics of high resistivity and high frequency of use, and is suitable for making various surface mount components. [0003] Power inductors often require nickel-zinc ferrite cores to be resin-encapsulated after winding. Resin encapsulation often produces stress on the nickel-zinc ferrite core, and the stress will cause the inductance of the nickel-zinc ferrite cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 聂敏马占华黄宏辉孙蒋平申志刚
Owner TDG HLDG CO LTD
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