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Manganese zinc ferrite of high magnetic conductivity high saturation magnetic flux density high Curie temperature

A technology of ferrite material and magnetic flux density, applied in the field of MnZn ferrite, which can solve the problems of reducing volume and narrow installation space.

Inactive Publication Date: 2009-03-18
SHANDONG ZHONGRUI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: for a material with μi=6000, its saturation magnetic flux density and Curie temperature are usually: Bs=400mT±10%, Tc≥140℃. This material cannot meet the requirements of automotive electronics and network communication at all, due to many Automotive electronic control systems are located in the engine compartment, and some are even very close to the engine. The working environment is very harsh. In order to ensure high reliability, all components are required to work normally within a wide temperature range of -40°C to 150°C. It is required that the material has a higher Curie temperature, and from a safety point of view, the higher the better; on the other hand, due to the narrow installation space in the car, the electronic components are required to be as small as possible, and must also have excellent electromagnetic properties , which requires that the material must have a high initial permeability μi to reduce the number of coil turns, thereby achieving the purpose of reducing the volume. At the same time, in order not to affect the performance and efficiency of components, the saturation magnetic flux density of the material must be increased

Method used

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  • Manganese zinc ferrite of high magnetic conductivity high saturation magnetic flux density high Curie temperature

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preparation example Construction

[0018] A typical embodiment of the ferrite preparation method of the present invention, with the following steps:

[0019]1) Mixing of raw materials: According to the following raw material formula: Fe 2 o 3 : 54.1mol%, ZnO: 13mol%, MnO: 32.9mol% Weigh raw materials;

[0020] 2) Sanding once:

[0021] Put the weighed raw materials into the sand mill, and add equal weight of deionized water in advance, and sand for 0.5 hours;

[0022] 3) Primary spray drying granulation:

[0023] Add about 10% PVA solution (concentration is 10%) in raw material slurry, carry out spray drying granulation once;

[0024] 4) Pre-burning: the primary spray-dried granulated powder is pre-fired through a rotary kiln, and the firing temperature is 900°C;

[0025] 5) Addition of impurities (ingredients): Add the following auxiliary components: CoO: 0.08wt%, Bi 2 o 3 : 0.03wt%; while MoO 3 : 0.02wt%, CaO: 0.045wt%, In 2 o 3 : 0.035wt% and WO 3 : 0.02wt% four kinds of added ingredients can be a...

Embodiment 1

[0031] Embodiment 1: take by weighing 54.1mol% Fe 2 o 3 , 32.9mol% MnO (raw material form is Mn3O4), 13mol% ZnO. Put it into a sand mill pre-added with deionized water to grind, control the average particle size to 0.8±0.2μm, and pre-fire it with an electric rotary kiln at a temperature of 900±20°C after one spray. Then the pre-fired material is put into a sand mill for secondary sand grinding. During the sand grinding process, 35% of pure water, 0.008% of dispersant and 0.005% of defoamer are added relative to the content of the main component, and the additive CaO: 0.045wt% is added. 、WO 3 : 0.02wt%, CoO: 0.08wt%, Bi 2 o 3 : 0.03wt% to control the average particle size of the sand mill to be 1.0±0.2μm. Finally, secondary spraying is carried out to obtain MnZn ferrite particle powder. Take the pellets and press them into φ25mm×φ15mm×7.5mm, the density is about 3.0±0.2g / cm 3 Put the ferrite blank into a bell furnace, and sinter at 1395°C for 5 hours in an equilibrium at...

Embodiment 2

[0032] Embodiment 2: take by weighing 53.5mol% Fe 2 o 3 , 34.5mol% MnO (raw material form is Mn 3 o 4 ), 12mol% ZnO. Put it into a sand mill pre-added with deionized water to grind, control the average particle size to 0.8±0.2μm, and pre-fire it with an electric rotary kiln at a temperature of 900±20°C after one spray. Then the pre-fired material is put into a sand mill for secondary sand grinding. During the sand grinding process, 35% of pure water, 0.008% of dispersant and 0.005% of defoamer are added relative to the content of the main component, and the additive CaO: 0.045wt% is added. 、In 2 o 3 : 0.035wt%, WO 3 : 0.02wt%, CoO: 0.08wt%, Bi 2 o 3 : 0.03wt%, MoO 3 : 0.02wt%, the average grain size of the controlled sand mill is 1.0±0.2μm. Finally, secondary spraying is carried out to obtain Mn-Zn ferrite particle powder. Take the pellets and press them into φ25mm×φ15mm×7.5mm, the density is about 3.0±0.2g / cm 3 Put the ferrite blank into a bell furnace, and sinter...

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Abstract

The invention relates to a MnZn ferrite material with high magnetic permeability, high magnetic flux density and high curie temperature, wherein the ferrite material comprises principal component Fe2O3, ZnO, MnO and adding auxiliary components, the main component formulation is that: Fe2O3 is 48-55 mol%, ZnO is 8-16mol%, and MnO is 30-39mol%. The auxiliary components comprise CoO and Bi2O3, and the adding total amount of the auxiliary components is 0.03-0.40 percent of the principal component total amount. CoO:0.005-0.15wt%, Bi2O3:0.008-0.25wt%, one or more of CaO, In2O3, WO3 and MoO3 are added, and CaO:0.008-0.15wt%, In2O3:0.008-0.10wt%, WO3:0.008-0.10wt%, and MoO3:0.005-0.15wt%.

Description

technical field [0001] The invention relates to a MnZn ferrite, in particular to a MnZn ferrite material with high magnetic permeability, high saturation magnetic flux density and high Curie temperature and a preparation method thereof. Background technique [0002] With the development of electronic machines towards digitalization, multi-function and miniaturization, electronic systems are developing towards networking, high-speed and broadband. Therefore, the performance of magnetic materials, especially MnZn ferrite materials, is getting higher and higher. requirements. In the next few years, with the rapid development of automotive electronics and the gradual commercialization of next-generation Internet, new-generation mobile communications, and digital TV, the market demand for high-performance MnZn ferrite cores will be greatly expanded. [0003] Automotive electronics can be roughly divided into two categories according to their functions, namely, vehicle body elect...

Claims

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Application Information

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IPC IPC(8): H01F1/11C04B35/26C04B35/64
Inventor 陆明岳
Owner SHANDONG ZHONGRUI ELECTRONICS
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