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Manganese zinc ferrite material for resisting EMI and preparation method thereof

A technology of manganese-zinc ferrite and auxiliary materials, applied in the field of ferrite materials, can solve the problems of insufficient comprehensive properties of materials, low Curie temperature, and insufficient Bs, and achieve high magnetic permeability, high Curie temperature, and comprehensive magnetic properties. Excellent effect

Active Publication Date: 2016-05-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many companies have introduced broadband high-impedance materials with a magnetic permeability of 12,000, they basically have shortcomings in some indicators, such as low Curie temperature (less than 130°C) or Bs is not high enough, making the comprehensive performance of materials performance is not good enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] will be proportioned as Fe 2 o 3 : 51.16mol%, ZnO: 20.1mol%, Mn 3 o 4 : 28.74mol% (converted into mass percentage as Fe 2 o 3 : 68.98wt%, ZnO: 13.81wt%, Mn 3 o 4 : 17.21wt%) of the three main raw materials are mixed, and then pre-fired at a temperature of 700-1000 ° C, by adding the auxiliary component CaCO 3 : 200ppm, Bi 2 o 3 : 300ppm, MoO 3 : 100ppm, TiO 2 : 400ppm, and other auxiliary components Nb 2 o 5 : 75ppm, after mixing, ball milling, drying, granulation, compression molding, molding pressure 8MPa, and finally sintering, the sintering process is: heating to 1100°C at a heating rate of 2-4°C / min, and oxygen in this section The pressure concentration is controlled at 0.05%, and this section is controlled at a very low oxygen partial pressure concentration; then heated to 1350°C at a heating rate of 1-3°C / min, and first kept warm for 8 hours, and the oxygen partial pressure concentration is controlled at 21%. Then keep warm for 4h again, the oxygen p...

Embodiment 2

[0029] will be proportioned as Fe 2 o 3 : 51.44mol%, ZnO: 20.28mol%, Mn 3 o 4 : 28.28mol% of the three main raw materials are mixed, and then pre-fired at a temperature of 700-1000 ° C, by adding the auxiliary component CaCO 3 : 200ppm, Bi 2 o 3 :: 300ppm, MoO 3 : 100ppm, TiO 2 : 400ppm, and other auxiliary components Nb 2 o 5 : 100ppm, mixed by ball milling, drying, granulation, and then compression molding. The sintering process and test conditions are the same as in Example 1. The test results are shown in Table 1 and Table 2.

Embodiment 3

[0031] Under the constant situation of keeping the master formula of embodiment 1, suitably adjust the MoO in the minor formula 3 Increased to 350ppm, Nb 2 o 5 reduced to 50ppm and TiO 2 Reduced to 250ppm, after mixing, ball milling, drying, granulation, then compression molding, sintering with the same sintering process as in Example 1. The results can still achieve the target. When the frequency is ≤200kHz, the magnetic permeability increases, but when it exceeds 200kHz, the magnetic permeability decreases faster, and the impedance coefficient decreases. The test results are shown in Table 1 and Table 2.

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Abstract

The present invention discloses a manganese zinc ferrite material for resisting EMI and a preparation method thereof The specific operation steps are as follows: (1) mixing: weighing the main ingredients in accordance with the corresponding percentage, mixing by ball milling, and spray-drying a slurry to obtain a powder; (2) pre-calcining: pre-calcining the powder in a box electric resistance furnace; (3) weighing of accessories: weighing accessories in accordance with the percentage of the accessories in the total weight of the pre-calcined materials; (4) a secondary ball milling: subjecting the pre-calcined material supplemented with the accessories to a secondary ball milling; (5) granulation: conducting spray granulation on the slurry after the secondary milling; (6) molding: subjecting the powder after spray granulation to press-molding; and (7) sintering: conducting sintering treatment in sintering equipment of a bell-type furnace with strictly controlled atmosphere. The invention has the beneficial effects that the prepared manganese zinc ferrite material has high impedance characteristic, high magnetic permeability, high Curie temperature Tc, high saturation magnetic induction intensity Bs, and excellent integrated magnetic properties and can be well applied to the anti-EMI components.

Description

technical field [0001] The invention relates to the related technical field of ferrite materials, in particular to a manganese-zinc ferrite material for anti-EMI and a preparation method thereof. Background technique [0002] At present, with the development of electronic technology, electronic products and complete machines are developing in the direction of miniaturization and greening, and the requirements for high magnetic permeability materials are also getting higher and higher. For example, for transformers with the same requirements on inductance parameters, the higher the permeability of the magnetic material, the smaller the volume of the transformer. It can be seen that in the field of electronic technology, the application and demand of magnetic materials with high magnetic permeability are extensive. [0003] With the continuous development of electronic technology, especially the rapid development of digital technology, countries all over the world have put fo...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/626
CPCC04B35/2658C04B35/62645C04B2235/3208C04B2235/3232C04B2235/3253C04B2235/3256C04B2235/3298C04B2235/6562C04B2235/6567
Inventor 沈冠群王国光孙永阳王朝明朱航飞
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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