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Manganese-zinc power ferrite material and preparation method thereof

A ferrite material and power technology, which is applied in the field of magnetic materials to achieve the effects of reducing residual loss, increasing cut-off frequency and high saturation magnetic induction intensity

Inactive Publication Date: 2021-06-18
SHANGHAI BAOSTEEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents CN108911733A and CN108863338A respectively announced manganese-zinc ferrite materials suitable for 5MHz, but all used rare metal indium, gallium or toxic metal cadmium

Method used

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  • Manganese-zinc power ferrite material and preparation method thereof
  • Manganese-zinc power ferrite material and preparation method thereof
  • Manganese-zinc power ferrite material and preparation method thereof

Examples

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preparation example Construction

[0045]

[0046] The preparation method of manganese zinc power ferrite material of the present invention comprises the steps:

[0047] (1), put main component into ball mill and carry out ball milling and mixing, once ball milling 30-60min, obtain mixed powder;

[0048] (2), the mixed powder is placed in a horse boiling furnace to keep warm, and pre-fired to obtain the pre-fired powder;

[0049] (3) After pulverizing the calcined powder, carry out secondary ball milling, and put it into a grinder, add auxiliary components and pure water for sand milling at the same time, and control the particle size at 1-2 μm;

[0050] (4), drying the slurry after the sanding in step (3), and adding polyvinyl alcohol to granulate, and pressing after drying to obtain a molded blank;

[0051] (5) Put the formed blank into a sintering furnace with atmosphere adjustment, and sinter it under the atmosphere of nitrogen and oxygen.

[0052] Wherein, in step (1), the main components include 73-74...

Embodiment 1

[0061] The preparation method of the manganese zinc power ferrite material of the present embodiment comprises the following steps:

[0062] (1), the Fe of 73.34wt% 2 o 3 , 3.30wt% of ZnO and the balance of MnO are put into a ball mill for ball milling and mixing, once ball milling for 30min, to obtain a mixed powder;

[0063] (2), place the mixed powder in a horse boiling furnace at 900°C, heat it for 1 hour to pre-burn, and obtain the pre-burned powder;

[0064] (3) Secondary ball milling for 60 minutes after the calcined powder is pulverized, and put into a grinder, and simultaneously add auxiliary components (as shown in Table 1) and pure water for sand milling, and the particle size is controlled to be 1 μm;

[0065] (4), drying the slurry after sanding in step (3), adding 15wt% polyvinyl alcohol (PVA) to granulate, drying at 250°C and then pressing to form, so as to obtain a molded blank;

[0066] (5), the molded blank is put into the sintering furnace with atmosphere...

Embodiment 2

[0072] The preparation process and main components are the same as in Example 1, and the changed additive (subcomponent) content is listed in Table 1. The test conditions are the same as in Example 1, and the test results are listed in Table 2.

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Abstract

The invention provides a manganese-zinc power ferrite material and a preparation method thereof. The ferrite material comprises the following main components: 73-74 wt% of ferric oxide, 3-4 wt% of zinc oxide and the balance of manganese oxide, and comprises the following auxiliary components: 500-1000 ppm of calcium carbonate, 200-500 ppm of silicon dioxide, 2000-5000 ppm of cobaltosic oxide, 100-200 ppm of zirconium oxide, 200-600 ppm of niobium pentoxide, 100-200 ppm of zirconium oxide, 200-1000 ppm of titanium dioxide and 1000-2000 ppm of copper calcium titanate. The high-frequency loss of the manganese-zinc power ferrite material is reduced through trace additives such as copper calcium titanate, the power loss of the manganese-zinc ferrite material is greatly reduced while the magnetic conductivity and saturation flux density performance are kept not deteriorated, and the manganese-zinc power ferrite material has high saturation flux density.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a manganese-zinc power ferrite material suitable for 5MHz and a preparation method thereof. Background technique [0002] Manganese zinc ferrite is an important soft magnetic material, mainly used in the manufacture of various magnetic components, such as transformer cores, inductors, etc. Manganese zinc ferrite has higher initial magnetic permeability than nickel ferrite, and has lower loss than iron-based amorphous alloy, cobalt-based amorphous alloy, Fe-Si-Al, Fe-Si-Cr metal magnetic powder core . With the development of power electronics technology, the application trend of miniaturization, integration and thinning of magnetic components requires manganese zinc ferrite materials to be able to adapt to higher frequency of use. Domestic and foreign enterprises have developed manganese-zinc power ferrite with a frequency up to 500-3MHz by improving the p...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2658C04B35/622C04B2235/3208C04B2235/3418C04B2235/3244C04B2235/3275C04B2235/3251C04B2235/3232C04B2235/3281C04B2235/6562C04B2235/6567C04B2235/6584
Inventor 许杰顾燮峰李斌刘国平张晓华
Owner SHANGHAI BAOSTEEL MAGNETICS
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