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Method for pre-sintering soft magnetic manganese-zinc high-permeability powder in microwave kiln and preparation method of soft magnetic manganese-zinc high-permeability powder

A microwave sintering and microwave frequency technology, applied in the field of electromagnetic materials, can solve the problems of consumption of large petrochemical resources or electric energy, uneven heating of materials, unstable product quality, etc., to reduce energy consumption, high product quality stability, and shorten production cycle effect

Inactive Publication Date: 2012-07-18
湖南阳东微波科技有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The heat energy of the above-mentioned device is respectively oil and gas combustion heat and electric energy conduction heat. The disadvantages of using the existing method to pre-burn the mixture are: firstly, it needs to consume a large amount of petrochemical resources or electric energy, and the energy consumption is high; secondly, the material is heated unevenly, which is prone to The phenomenon of over-burning, unstable product quality

Method used

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  • Method for pre-sintering soft magnetic manganese-zinc high-permeability powder in microwave kiln and preparation method of soft magnetic manganese-zinc high-permeability powder

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preparation example Construction

[0035] The present invention also provides a preparation method of manganese zinc ferrite powder, the method comprising:

[0036] Send the manganese-zinc-ferrite mixture into a microwave high-temperature kiln for microwave sintering. The microwave frequency of microwave sintering is 2450MHz, and the sintering temperature is 700°C-900°C to obtain pre-sintered material;

[0037] The calcined material is sequentially cooled, sand-milled and spray-granulated to obtain manganese-zinc ferrite powder.

[0038] The preparation method of the manganese-zinc ferrite powder provided by the present invention is to pre-calcin the manganese-zinc ferrite mixture according to the above method, and then perform cooling, sand milling and spray granulation in sequence. The preferred schemes for the preparation method, sintering temperature and sintering time of the manganese-zinc-ferrite mixture in the pre-sintering process are consistent with the above contents.

[0039]After pre-fired, a black...

Embodiment 1

[0051] 1. Mix 70.2 wt% of ferric oxide, 14.3 wt% of trimanganese tetraoxide and 15.5 wt% of zinc oxide according to the proportion, and use a ball mill to mix to obtain a red solid mixed raw material. The red solid mixed raw material was added with water, stirred and then dried to obtain blocky red solid mixed material.

[0052] 2. Put the massive red solid mixture obtained in step 1 into the high-temperature zone of the microwave high-temperature kiln along with the roller table for microwave sintering. The microwave frequency is 2450MHz, the total power is 75KW, and the temperature in the high-temperature zone is controlled at 750°C. 10Kg, enter the high temperature zone at a speed of 10 boards / hour for 30 minutes to fully cure the reaction. Then the pre-fired material is sent to the cooling zone for cooling, and then exits the kiln to obtain the pre-fired material.

[0053] 3. Send the pre-fired material obtained in step 2 into a sand mill, and add 0.18wt% of the weight of...

Embodiment 2

[0057] 1. Mix 70.2 wt% of ferric oxide, 14.3 wt% of trimanganese tetraoxide and 15.5 wt% of zinc oxide according to the proportion, and use a ball mill to mix to obtain a red solid mixed raw material. The red solid mixed raw material is added with water, stirred and then dried to obtain blocky red solid mixed material.

[0058] 2. Put the lumpy red solid mixture obtained in step 1 into the high-temperature zone of the microwave high-temperature kiln along with the roller table for microwave sintering. The microwave frequency is 2450MHz, the total power is 75KW, and the temperature in the high-temperature zone is controlled at 800°C. 10Kg, enter the high temperature zone at a speed of 10 boards / hour for 60 minutes to fully cure the reaction. Then the pre-fired material is sent to the cooling zone for cooling, and then exits the kiln to obtain the pre-fired material.

[0059] 3. Send the pre-fired material obtained in step 2 into a sand mill, and add 0.18wt% of the weight of th...

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Abstract

The invention provides a method for pre-sintering and preparing manganese-zinc ferrite powder, and a preparation method of manganese-zinc ferrite material. The pre-sintering method comprises the following steps: delivering a manganese-zinc ferrite mixture in a microwave high-temperature kiln to perform the microwave sintering, wherein the microwave frequency of the microwave sintering is 2450 MHz and the sintering temperature is 700 DEG C-900 DEG C. In the process of pre-sintering, the mixture quickly absorbs the energy of the microwave from inside to outside under the action of the microwave, the entire material uniformly generates heat, is evenly heated and not easy to excessively sinter, so that the product quality is stable; and as the heating speed of the microwave is high, the time for raising the temperature of the mixture to the required temperature of solid phase reaction is shortened, the producing period is shortened and the energy consumption is also reduced. Therefore, the method for pre-sintering the manganese-zinc ferrite powder, provided by the invention, has the characteristics of high product quality stability and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of electromagnetic materials, in particular to a method for pre-burning soft magnetic manganese-zinc high-conductivity powder in a microwave kiln and a preparation method for soft-magnetic manganese-zinc high-conductivity powder. Background technique [0002] Soft ferrite materials have the characteristics of high magnetic permeability, high resistivity, low loss, and high wear resistance, and are widely used in the fields of computers, communications, and electromagnetic compatibility. In recent years, the demand for high-performance electronic components has increased significantly, and higher requirements have been placed on the performance of soft ferrite materials. [0003] Soft magnetic ferrite mainly includes manganese-zinc and nickel-zinc series. Among them, manganese-zinc series has a large output and a wide range of uses. It is suitable for low frequency below 1MHz and is mainly used in communicati...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/64
Inventor 刘伏初李蔚霞陶立平
Owner 湖南阳东微波科技有限公司
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