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Low dissipative ferrite material of manganese and zinc in broad frequency, and high magnetic permeability, and preparation method

A technology of manganese-zinc ferrite and high magnetic permeability, which is applied in the direction of magnetic properties of inorganic materials, can solve the problems of large specific loss coefficient and unsatisfactory effect, achieve high magnetic permeability, improve overall magnetic properties, and improve performance Effect

Active Publication Date: 2007-10-10
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial magnetic permeability, specific loss coefficient, and specific temperature coefficient of the product obtained by the above method and the main and auxiliary components have been further improved compared with the previous technology, and the magnetic permeability-temperature characteristics have been improved; but due to the adoption in this patent application The effect of auxiliary raw materials on improving the specific loss coefficient is not ideal, so the specific loss coefficient is still relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Will Fe 2 o 3 (52.5 mole %), ZnO (23 mole %) and MnO (24.5 mole %) are carried out batching, vibrating ball mill dry mixing as main components, and the mixture obtained is put into the rotary kiln and pre-fired at 930 ℃ for 120 minutes. The obtained calcined body is added with auxiliary components as shown in Tables 1 to 4: Sand milled in a sand mill. Then, add PVA to it and granulate it by spray drying to an average diameter of 150 μm; use an automatic molding machine to form a blank with a certain shape; briquette to obtain a ring-shaped magnetic core sample with an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm. Sintering is carried out in an atmosphere with strictly controlled oxygen concentration. In the cooling stage, when the temperature is higher than 900°C, the oxygen concentration is strictly controlled according to the equilibrium oxygen partial pressure; below 900°C, the temperature is lowered in nitrogen.

[0029] The temperatu...

Embodiment 2

[0055] Will Fe 2 o 3 (52.8 mole %), ZnO (25.7 mole %) and MnO (21.5 mole %) are carried out batching, vibrating ball mill dry mixing as main components, and the mixture obtained is put into the rotary kiln and pre-fired at 890 ℃ for 120 minutes. The auxiliary components added to the obtained calcined body are shown in Table 5: Sand milled in a sand mill. Then, add PVA to it and granulate it by spray drying to form particles with an average diameter of 200 μm and a flow angle of less than 30 degrees, and use an automatic molding machine to form a blank with a certain shape; heat and hold at 1370 ° C for 7 hours , and then lower the temperature to sinter the obtained briquettes, thereby obtaining annular magnetic core samples 27-32 with an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm. Sintering is carried out in an atmosphere with strictly controlled oxygen concentration. In the cooling stage, when the temperature is higher than 900 °C, the oxygen ...

Embodiment 3

[0071] Fe2O3 (52.5 mol %), ZnO (20.5 mol %) and MnO (26.0 mol %) are used as the main components for batching, vibrating ball milling and dry mixing, and the obtained mixture is put into a rotary kiln and pre-fired at 850 ° C for 120 minutes. The auxiliary components added to the obtained calcined body are shown in Table 7: Sand milling is carried out in a sand mill. Then, add PVA to it and granulate it by spray drying to form particles with an average diameter of 80 μm and a flow angle of less than 30 degrees, and use an automatic molding machine to form a blank with a certain shape; heat and hold at 1350 ° C for 8 hours , and then lower the temperature to sinter the obtained briquettes, thereby obtaining annular magnetic core samples 33 to 38 with an outer diameter of 10 mm, an inner diameter of 6 mm, and a height of 4 mm. Sintering is carried out in an atmosphere with strictly controlled oxygen concentration. In the cooling stage, when the temperature is higher than 900 °C...

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Abstract

This invention provides a wide-frequency low-loss manganese-zinc ferrite material with high magnetic conductivity. The major components comprise: MnO 21.5-26.5 mol. %, ZnO 20.5-25.5 mol. %, and Fe2O3 as balance. The auxiliary components comprise: one or two of Na2O (measured by Na2CO3) 0.01-0.05 wt.%, and K2O (measured by K2CO3) 0.01-0.04 wt.%, Bi2O3 0-0.04 wt.%, MoO3 0-0.04 wt.%, and V2O5 0-0.05 wt.%. This invention also provides a method for preparing the wide-frequency low-loss manganese-zinc ferrite material.

Description

technical field [0001] The invention relates to a manganese-zinc ferrite material and a preparation method thereof, in particular to a manganese-zinc ferrite material with a wide frequency range, low loss and high permeability and a preparation method thereof, which can be used for a broadband transmission transformer magnetic core, and belongs to the oxidation Magnetic material technology field. Background technique [0002] With the rapid development of electronic information industries such as communications, computers, and networks, and the development trend of miniaturization and light weight of electronic components, high-permeability manganese-zinc ferrite materials can significantly reduce the volume of transformers and reduce losses, so its Research has attracted much attention at home and abroad. In practical applications, in addition to high magnetic permeability, the market also requires materials to have good temperature characteristics, frequency characteristi...

Claims

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Application Information

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IPC IPC(8): C04B35/26H01F1/01
Inventor 何时金刘志勇王栩包大新杨正忠田海
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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