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High saturated flux low consumption MnZn power ferrite and its preparation method

A technology of magnetic flux density and ferrite, applied in the field of manganese-zinc ferrite and its preparation, can solve the problems of easy occurrence of liquid phase, increase of production cost, deterioration of material performance, etc.

Active Publication Date: 2007-12-19
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO 2 Added as an additive to the pre-sintered material, although it can increase the resistivity of the material, it is easy to appear a liquid phase during the sintering process, and the probability of abnormal grains will increase.
If abnormal grains appear inside the material, the performance of the material will deteriorate
In addition, some people improve the performance of materials through desulfurization process or fine grinding process, but this increases the production cost and increases the difficulty of popularizing and applying materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Ingredients:

[0029] Weigh Fe 2 o 3 : 52.7mol%; MnO: 37.1mol%; ZnO: 10.2mol% three kinds of raw materials, and then add deionized water in the sand mill for mixing and crushing, crushing for 30 minutes, after 10 minutes of circulating mixing, spraying grain.

[0030] 2. Pre-burning:

[0031] Put the spray material into the pre-burning furnace, and pre-fire it at 920°C, and the total pre-burning time is 6 hours.

[0032] 3. Secondary sanding:

[0033] Add the following auxiliary components according to the weight percentage of the pre-fired material in the pre-fired material: CaCO 3 : 0.03wt%, TiO 2 : 0.04wt%, Nb 2 o 5 : 0.03wt%, Co 2 o 3 : 0.025wt%, ZrO 2 : 0.02wt%. Then put the powder into a sand mill and add deionized water for secondary sand milling. The sand milling time is 1 hour, and the particle size of the powder is controlled at 1-1.18 μm.

[0034] 4. Spray granulation and molding:

[0035] Add a certain proportion of PVA and defoamer to the s...

Embodiment 2

[0043] 1. Ingredients:

[0044] Weigh Fe 2 o 3 ZnO: 51mol%; MnO: 43mol%; ZnO: 6mol% three kinds of raw materials, then add deionized water in the sand mill for mixing and crushing, crushing for 40 minutes, carry out circulation mixing for 10 minutes, and then carry out spray granulation.

[0045] 2. Pre-burning:

[0046] Put the spray material into the pre-burning furnace, and pre-fire it at 750°C, and the total pre-burning time is 9 hours.

[0047] 3. Secondary sanding:

[0048] Add the following auxiliary components according to the weight percentage of the pre-fired material in the pre-fired material: CaCO 3 : 0.01wt%, TiO 2 : 0.08wt%, SnO 2 : 0.03wt%, Co 2 o 3 : 0.06wt%, ZrO 2 : 0.01 wt%. Then put the powder into a sand mill and add deionized water for secondary sand milling. The sand milling time is 2 hours, and the particle size of the powder is controlled at 1-1.18 μm.

[0049] 4. Spray granulation and molding:

[0050] Add a certain proportion of PVA and de...

Embodiment 3

[0058] 1. Ingredients:

[0059] Weigh Fe 2 o 3 : 53mol%; MnO: 34mol%; ZnO: 13mol% three kinds of raw materials, then add deionized water in the sand mill for mixing and crushing, crushing for 50 minutes, carry out circulation mixing for 10 minutes, and then carry out spray granulation.

[0060] 2. Pre-burning:

[0061] Put the spray material into the pre-burning furnace, and pre-fire it at 980°C, and the total pre-burning time is 1 hour.

[0062] 3. Secondary sanding:

[0063] Add the following auxiliary components according to the weight percentage of the pre-fired material in the pre-fired material: TiO 2 : 0.01wt%, SnO 2 : 0.07wt%, Co 2 o 3 : 0.06wt%, ZrO 2 : 0.09wt%. Then put the powder into a sand mill and add deionized water for secondary sand milling. The sand milling time is 3 hours, and the particle size of the powder is controlled at 1-1.18 μm.

[0064] 4. Spray granulation and molding:

[0065] Add a certain proportion of PVA and defoamer n-octanol to the...

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Abstract

This invention relates to an MnZn power ferrite of high saturated flux density and low loss and its preparation method, which develops a MnZn power ferrite with less than or equal to 260mW / cm3 power loss under the valley temperature of 90deg.C and 100KHz and 200mT, the saturated flux density greater than or equal to 530mT under 25deg.C, 1000A / m and 50Hz and the saturated flux density greater than or equal to 420mT at 100deg.C under the condition of 1000A / m and 50Hz.

Description

technical field [0001] The invention relates to a manganese zinc ferrite and a preparation method thereof, in particular to a high saturation magnetic flux density and low loss MnZn power ferrite and a preparation method thereof, Background technique [0002] With the popularity of portable mobile electronic devices, the rapid development of multimedia communications and digital networks, and the needs of electromagnetic compatibility and anti-electromagnetic interference, higher and newer requirements are put forward for power MnZn ferrite materials. With the expansion of emerging application fields, power MnZn ferrite requires high saturation magnetic flux density in addition to low loss. At the same time, for different working environments, there should be different minimum power consumption temperature points on the power consumption-temperature curve. For high-performance power MnZn ferrite, in addition to selecting raw materials with anisotropy, low magnetostriction a...

Claims

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Application Information

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IPC IPC(8): H01F1/10H01F1/34
Inventor 吕东华颜冲包大新何时金
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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