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High-magnetic-permeability manganese-zinc series ferrite and preparation method thereof

A high-permeability, ferrite technology, applied in the field of high-permeability manganese-zinc ferrites

Active Publication Date: 2015-03-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application publication CN1219159A describes that although the normal temperature magnetic permeability of MnZn ferrite is as high as 15,000 or even higher, the Curie temperature Tc≤110°C
At present, there is no high permeability MnZn ferrite with saturation magnetic flux density Bs≥440mT at 25°C, Bs≥250mT at 100°C, initial permeability μi≥14000 at 10kHz, and Curie temperature Tc≥130°C.

Method used

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  • High-magnetic-permeability manganese-zinc series ferrite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0061] A preparation method of manganese-zinc ferrite (Ф25×Ф15×10 manganese-zinc R15k product), specifically comprising the following steps:

[0062] 1) The main component Fe 2 o 3 , ZnO and MnO were added according to the formula in Table 1, wet mixed for about 30 minutes, and sprayed to obtain primary granules;

[0063] 2) Pre-burning the primary pellets at 700-900°C for 2-3 hours to obtain pre-fired material;

[0064] 3) According to the weight of the main components, add auxiliary components 100ppm CaO, 300ppm Bi to the calcined material 2 o 3 , 200ppm MoO 3 , 200ppm Nb 2 o 5 and 100ppm Ti 2 o 5 , carry out secondary wet sand grinding; control the particle size of the secondary wet grinding slurry to SMD=1.20 μm to obtain ferrite slurry;

[0065] 4) Add 0.5wt% PVA binder, 0.5wt% dispersant 1-methylpentanol and 0.2wt% defoamer silicon oxide to ferrite slurry Spray granulation with alkane; the granulated powder is molded into a blank, and the density of the blank i...

Embodiment 12～21

[0081] Select the main recipe component of embodiment 4: Fe 2 o 3 52.8mol%, ZnO is 26.0mol%, MnO is 21.5mol%, then change the content of auxiliary components according to Table 2, manufacture according to the technique of Example 4, obtain following data through testing:

[0082] Table 2 embodiment 4, the adjuvant formula of 12~21 and test result

[0083]

Embodiment 22～25

[0095] Select the content of the main formula components and auxiliary components of Example 4, then change the secondary wet abrasive particle size SMD according to Table 3, and then manufacture according to the process in Example 4, and obtain the following data after testing: Table 3 Example 4 , 22 to 25 SMD size and test results

[0096]

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Abstract

The invention discloses high-magnetic-permeability manganese-zinc series ferrite and a preparation method thereof, belonging to the field of high-magnetic-permeability manganese-zinc series ferrite. The high-magnetic-permeability manganese-zinc series ferrite is prepared from a ferrite pre-sintering material, an auxiliary component, an adhesive, a dispersing agent and a defoaming agent, wherein the ferrite pre-sintering material comprises the following components: 52.0-53.0mol% of Fe2O3, 20.0-22.0mol% of ZnO and 25.0-28.0mol% of MnO. The high-magnetic-permeability manganese-zinc series ferrite can be used for producing a manganese-zinc ferrite magnetic ring of a specification of phi 25* phi 15*10, and the following excellent effects are achieved: B is less than 0.25mT at 25 DEG C, mu(i) is greater than or equal to 14000 under the condition of 10kHz, mu(i) is greater than or equal to 10000 under the condition of 150kHz, the Curie temperature Tc is greater than or equal to 130 DEG C, Bs is greater than or equal to 440mT under the conditions of 50Hz and 1194A / m at 25 DEG C, and Bs is greater than or equal to 250mT at 100 DEG C.

Description

technical field [0001] The invention belongs to the field of manganese-zinc ferrite with high magnetic permeability, and in particular relates to a manganese-zinc ferrite with high magnetic permeability and a preparation method thereof. Background technique [0002] With the rapid development of digital communication technology and optical fiber communication technology, traditional analog communication equipment is constantly updated and eliminated. High permeability Mn-Zn ferrite cores used in broadband transformers in electronic circuits, pulse transformers in the fields of integrated business data networks, local area networks, wide area networks, background lighting, and photovoltaic inverters for common mode filter inductors, due to transformers, etc. With the development of miniaturization, higher requirements are put forward for the magnetic properties of manganese zinc ferrite. The improvement of magnetic permeability is conducive to the miniaturization of devices....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C04B35/622
Inventor 王国光孙永阳沈冠群朱东梅黄巧媛
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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