A six-stage atmosphere control method for manganese zinc power ferrite

A control method and ferrite technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as the influence of heat preservation and cooling systems, and achieve the effect of improving high-frequency magnetic properties

Active Publication Date: 2020-07-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are still many patents on the MnZn ferrite sintering system, most of the patents are about the influence of the heat preservation and cooling system on the distribution of dopant ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0019] The main component of selected raw materials is recorded as: 55.1mol% Fe in mole fraction 2 o 3 , 40mol% MnO 2 , 4.9 mol% ZnO. The main components are mixed for wet milling, the ball milling time is 4h, the dried powder is put into pre-calcination, sintered at 950°C and air atmosphere for 2h, and then furnace cooled. The sintered powder was mixed with 500ppmCaO, 300ppmV 2 o 5 , 300ppmZrO 2 , 100ppmNb 2 o 5 , 200ppmCo 2 o 3 Mixing, wet milling for 8 hours and then drying, the average particle size of the powder is below 1um. When granulating, add 2wt% polyvinyl alcohol solution with a concentration of 10wt% and a small amount of zinc stearate to obtain large granules with a particle size of 50-100um. Then press the powder into shape to ensure that the density of the green body is 2.8-3.0g / cm 3 between. Put the green body into sintering, first raise the temperature to 400°C at a heating rate of 2°C / min and keep it warm for 2 hours to ensure complete debinding....

Embodiment 1

[0023] Compared with Comparative Example 1, the magnetic permeability of the obtained material in Example 1 is slightly higher, but the magnetic loss is significantly reduced. Under the above three measurement conditions, the magnetic loss reduction is at least more than 15%. This shows that the combination of high-temperature low-oxygen atmosphere and low-temperature high-oxygen atmosphere effectively strengthens the high-valent ions and Fe 2+ At the same time, the heat preservation and pressure holding process in the cooling section makes the grain boundaries more uniform and thicker, and the superimposed effect makes the eddy current loss of the material significantly reduced.

Embodiment example 2

[0025] The main component of selected raw materials is recorded as: 54.5mol% Fe in mole fraction 2 o 3 , 38.0mol% MnO 2 , 7.5 mol% ZnO. The main components are mixed for wet milling, the ball milling time is 2h, the dried powder is put into pre-calcination, sintered at 920°C and air atmosphere for 2h, and then furnace cooled. The sintered powder was mixed with 2000ppmCaO, 500ppmSiO 2 , 200ppmSnO 2 , 200ppmNb 2 o 5 , 300ppmNiO, 300ppmZrO 2Mixing, wet milling for 10h and then drying, the average particle size of the powder is below 1um. When granulating, add 2wt% polyvinyl alcohol solution with a concentration of 10wt% and a small amount of zinc stearate to obtain large granules with a particle size of 50-100um. Then the powder is pressed into shape to ensure that the density of the green body is between 2.8-3.0g / cm3. Put the green body into sintering, first raise the temperature to 300°C at a heating rate of 3°C / min and keep it warm for 3 hours to ensure complete debin...

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Abstract

The invention discloses a six-section atmosphere controlling method of manganese-zinc power ferrite. The six-section atmosphere controlling method mainly comprises the following steps of during secondary burdening, adding a proper amount of doping elements; and dividing a sintering process into six-section temperature holding and pressure holding platforms: firstly, performing temperature holdingfor 2-5h at an interval from 1150 DEG C to 1250 DEG C, and controlling 0.25-1 percent low oxygen atmosphere; then performing temperature holding for 1-2h at an interval from 1080 DEG C to 1120 DEG C,and controlling 2.5-4 percent high oxygen atmosphere; then performing temperature holding for 30-60min at intervals from 990 DEG C to 1020 DEG C, from 900 DEG C to 950 DEG C and from 750 DEG C to 800DEG C respectively, and keeping a balanced atmosphere; and finally, performing temperature holding for 1-2h at 500-600 DEG C. The six-section atmosphere controlling method has the innovation that through six temperature holding and control on oxygen partial pressure, migration of Fe2+ can be effectively prevented, high-resistivity crystal boundary is acquired, eddy current loss is effectively lowered, the internal stress of a material is lowered at the same time, and thus excellent high-frequency alternative magnetic performance is obtained.

Description

technical field [0001] The invention relates to a six-stage atmosphere control method for manganese-zinc power ferrite, which belongs to the technical field of manganese-zinc ferrite sintering. Background technique [0002] In recent years, as the core and key technologies of complete electronic products are rapidly transferring to components, the application requirements of lightness, thinness, shortness, smallness, high performance, high reliability, and high environmental adaptability promote the miniaturization and miniaturization of electronic components. , sliced ​​and integrated direction. In order to meet application requirements and improve competitiveness, power ferrite should be further developed in the direction of high frequency, low loss, wide temperature range, and high magnetic permeability. [0003] Studies have shown that the sintering process of manganese zinc ferrite has a significant impact on controlling the power consumption of the product and its min...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/626C04B35/632C04B35/634C04B35/638H01F41/02
CPCC04B35/2658C04B35/622C04B35/62605C04B35/632C04B35/63416C04B35/638C04B2235/3208C04B2235/3239C04B2235/3244C04B2235/3251C04B2235/3275C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/661H01F41/02
Inventor 严密易胜波金佳莹白国华王新华吴琛张雪峰
Owner ZHEJIANG UNIV
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