High-frequency high-impedance material of manganese-zinc ferrite and preparation method of high-frequency high-impedance material

A manganese-zinc ferrite, high-impedance technology, applied in the field of ferrite, to achieve the effect of good product compactness, superior performance, and perfect grain development

Active Publication Date: 2015-04-08
浙江恩大智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the impedance value Z of the traditional manganese zinc ferrite 5K high conductor material on the market starts from 1KHz and increases with the increase of frequency. After reaching 600-700KHz, the Z value begins to decrease with the increase of frequency, and continues to 10MHz. The Z value begins to increase with the increase of the frequency, the ferrite surface DC resistance (DCR) is between 200-500kΩ, the magnetic permeability μi is between 4000-6000, and with the development of the times, the high-conductivity materials The requirements are getting higher and higher, especially some high-end components (such as temperature-adjusting transformer components used in large air conditioners) require that the Z value increases with the frequency from the initial value, and the DCR is greater than or equal to 1MΩ. The conductivity μi is between 3200 and 4800, so traditional 5K high-conductivity materials cannot meet this requirement

Method used

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  • High-frequency high-impedance material of manganese-zinc ferrite and preparation method of high-frequency high-impedance material
  • High-frequency high-impedance material of manganese-zinc ferrite and preparation method of high-frequency high-impedance material

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preparation example Construction

[0041] The preparation method of the above-mentioned manganese-zinc ferrite high-frequency high-impedance material includes:

[0042] 1) preparing manganese zinc ferrite powder;

[0043] Wherein, in step 1), batching, mixing, and ball milling are carried out according to the weight percentage of the main components; the ball-milled powder is put into a resistance furnace for pre-burning, the pre-burning temperature is 850 ° C, and the holding time is 3 hours; Coarse pulverization is carried out after pre-calcination; then microcomponents are added, mixed, and finely pulverized; finally, spray granulation is carried out to adjust the granules to obtain powder.

[0044] 2) pressing the powder into shape to obtain a blank;

[0045] 3) The blank is placed in a closed reactor for sintering at a temperature of 1300-1450° C., then kept for 5-10 hours, and then lowered to below 300° C.

Embodiment 1

[0048] The manganese-zinc ferrite high-frequency high-impedance material provided by Embodiment 1 of the present invention has a main component of 60% Fe in terms of weight percentage 2 o 3 , 15% MnO, 20% ZnO and 4.5% CuO;

[0049] Trace components are: 1100ppmTa 2 o 3 , 1000ppmCaCO 3 , 550ppmCoO, 500ppmTiO 2 , 400ppmNiO, 400ppmSnO 2 、300ppm Bi 2 o 3 、300ppmCr 2 o 3 , 150ppmV 2 o 5 , 150ppmNb 2 o 5 , 80ppmSiO 2 , 10ppmMoO 3 , 40ppmMgO and 20ppmAl 2 o 3 .

[0050] Preparation:

[0051] S11: preparing manganese zinc ferrite powder;

[0052] S12: pressing the powder to form a blank;

[0053] Wherein, S11 and S12 are respectively consistent with step 1) and step 1), and will not be repeated here.

[0054] S13: The blank is placed in a closed reactor for sintering at a temperature of 1340° C. and then kept for 10 hours, and then the temperature is lowered to below 300° C.

[0055] Specifically, in step S13:

[0056] Put the blank in a closed reactor for sinte...

Embodiment 2

[0058] The manganese-zinc ferrite high-frequency high-impedance material provided by Embodiment 2 of the present invention has a main component of 70% Fe in terms of weight percentage 2 o 3 , 14.5% MnO, 13% ZnO and 2% CuO;

[0059] Trace components are: 1300ppmTa 2 o 3 , 1000ppmCaCO 3 , 500ppmCoO, 500ppmTiO 2 , 400ppmNiO, 350ppmSnO 2 、240ppm Bi 2 o 3 , 280ppmCr 2 o 3 , 150ppmV 2 o 5 , 110ppmNb 2 o 5 , 60ppmSiO2 2 , 20ppmMoO 3 , 50ppmMgO and 40ppmAl 2 o 3 .

[0060] Preparation:

[0061] S21: preparing manganese zinc ferrite powder;

[0062] S22: pressing the powder to form a blank;

[0063] Wherein, S21 and S22 are consistent with S11 and S12 respectively, and will not be repeated here.

[0064] S23: The blank is placed in a closed reactor for sintering at a temperature of 1400° C. and then kept for 5 hours, and then the temperature is lowered to below 300° C.

[0065] Specifically, in step S23:

[0066] Put the blank in a closed reactor for sintering. T...

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Abstract

The invention provides a high-frequency high-impedance material of manganese-zinc ferrite and a preparation method of the high-frequency high-impedance material. Under the premise that scientific ratio of iron to manganese to zinc in the manganese-zinc ferrite is ensured, a certain amount of micro-constituents are also added, and contain a plurality of metal ions: Cu<2+>, Ta<3+>, Ca<2+>, Co<2+>, Ti<4+>, Ni<2+>, Sn<4+>, Bi<3+>, V<5+>, Nb<5+>, Si<4+>, Mo<6+>, Mg<2+>, Al<3+>. The main constituents and a plurality of trace constituents work together; and the electromagnetic property of the material is changed by changing the grain boundary resistivity. Through detection, the impedance value of the high-frequency high-impedance material of the manganese-zinc ferrite rises along with increase of frequency (1KHz to 100MHz); the surface direct current is greater than or equal to 1Mohm; and the magnetic conductivity is between 3200 and 4800, and thus the high-frequency high-impedance material meets the application requirements of high-end original elements such as temperature-adjusting transformer elements of large air conditioners.

Description

technical field [0001] The invention relates to the field of ferrite, in particular to a manganese-zinc ferrite high-frequency high-impedance material and a preparation method thereof. Background technique [0002] As we all know, manganese zinc ferrite is the basic material of modern industry and manufacturing industry, and has a wide range of applications. However, the impedance value Z of the traditional manganese zinc ferrite 5K high conductor material on the market starts from 1KHz and increases with the increase of frequency. After reaching 600-700KHz, the Z value begins to decrease with the increase of frequency, and continues to 10MHz. The Z value begins to increase with the increase of the frequency, the ferrite surface DC resistance (DCR) is between 200-500kΩ, the magnetic permeability μi is between 4000-6000, and with the development of the times, the high-conductivity materials The requirements are getting higher and higher, especially some high-end components (...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 陈锡彪鲍卫勇
Owner 浙江恩大智能科技有限公司
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