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High-frequency high-Bs composite ferrite material and preparation method thereof

A ferrite material, manganese-zinc ferrite technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of difficult quantitative control and high production costs

Active Publication Date: 2022-03-04
TDG HLDG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with the publication number CN107352991A discloses a manganese-zinc / nickel-zinc composite ferrite with a core-shell structure. body, thereby preparing a ferrite with low power loss at high frequency and high cut-off frequency, but this method is completely different from the oxide method in the present invention, the production cost is high, and it is not easy to quantitatively control

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  • High-frequency high-Bs composite ferrite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] This embodiment prepares high frequency high Bs composite ferrite material according to the following method:

[0025] 1) According to Fe 2 o 3 72wt%, ZnO 4wt%, MnO 24wt% and Fe 2 o 3 The proportions of 66wt%, ZnO 22wt%, and NiO 12wt% were batched and mixed, and then pre-fired at 800°C and 850°C respectively to prepare pre-fired materials for manganese-zinc ferrite and nickel-zinc ferrite;

[0026] 2) Add CuO 1000ppm, Bi 2 o 3 300ppm and sanded to an average particle size of 0.5~3μm; the nickel-zinc ferrite calcined material is mixed with nano-Nb 2 o 3 250ppm, CaO 500ppm, Co 2 o 3 1000ppm and sanded to an average particle size of 0.5~3μm;

[0027] 3) Pre-fire the manganese-zinc magnetic powder and nickel-zinc magnetic powder obtained in step 2 again, and the pre-fired temperatures are 850°C and 900°C respectively;

[0028] 4) The secondary pre-fired magnetic powder is prepared by sand milling and high-energy ball milling into 0.5-3μm manganese-zinc magnetic ...

Embodiment 2

[0032] This embodiment prepares high frequency high Bs composite ferrite material according to the following method:

[0033] 1) According to Fe 2 o 3 72wt%, ZnO 4wt%, MnO 24wt% and Fe 2 o 3The proportions of 66wt%, ZnO 22wt%, and NiO 12wt% were batched and mixed, and then pre-fired at 800°C and 850°C respectively to prepare pre-fired materials for manganese-zinc ferrite and nickel-zinc ferrite;

[0034] 2) Add CuO 1000ppm, Bi 2 o 3 300ppm and sanded to an average particle size of 0.5~3μm; the nickel-zinc ferrite calcined material is mixed with nano-Nb 2 o 3 250ppm, CaO 500ppm, Co 2 o 3 1000ppm and sanded to an average particle size of 0.5~3μm;

[0035] 3) Pre-fire the manganese-zinc magnetic powder and nickel-zinc magnetic powder obtained in step 2 again, and the pre-fired temperatures are 850°C and 900°C respectively;

[0036] 4) The secondary pre-fired magnetic powder is prepared by sand milling and high-energy ball milling into 0.5-3μm manganese-zinc magnetic p...

Embodiment 3

[0040] This embodiment prepares high frequency high Bs composite ferrite material according to the following method:

[0041] 1) According to Fe 2 o 3 72wt%, ZnO 4wt%, MnO 24wt% and Fe 2 o 3 The proportions of 66wt%, ZnO 22wt%, and NiO 12wt% were batched and mixed, and then pre-fired at 800°C and 850°C respectively to prepare pre-fired materials for manganese-zinc ferrite and nickel-zinc ferrite;

[0042] 2) Add CuO 1000ppm, Bi 2 o 3 300ppm and sanded to an average particle size of 0.5~3μm; the nickel-zinc ferrite calcined material is mixed with nano-Nb 2 o 3 250ppm, CaO 500ppm, Co 2 o 3 1000ppm and sanded to an average particle size of 0.5~3μm;

[0043] 3) Pre-fire the manganese-zinc magnetic powder and nickel-zinc magnetic powder obtained in step 2 again, and the pre-fired temperatures are 850°C and 900°C respectively;

[0044] 4) The secondary pre-fired magnetic powder is prepared by sand milling and high-energy ball milling into 0.5-3μm manganese-zinc magnetic ...

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Abstract

The invention provides a high-frequency high-Bs composite ferrite material. A preparation method of the high-frequency high-Bs composite ferrite material comprises the following steps: 1) respectively preparing pre-sintered materials of manganese-zinc ferrite and nickel-zinc ferrite; 2) respectively sanding and adding auxiliary components; (3) respectively carrying out secondary presintering; (4) manganese-zinc micron-scale magnetic powder and nickel-zinc nano-scale magnetic powder are prepared through sanding and high-energy ball milling respectively; (5) uniformly mixing in a sand mill, and carrying out compression molding; and 6) sintering in an atmosphere furnace. Through the formula design of the main components, the auxiliary components, the fluxing agent and other doping components and the combination of the process design of secondary pre-sintering, sanding, high-energy ball milling, mixing and the like, a crystal grain shell layer structure with the inner layer being MnZnFeO4 and the outer layer being NiZnFeO4 is finally formed, the NiZnFeO4 structure of the outer layer increases the crystal boundary resistivity, the MnZnFeO4 structure of the inner layer also increases the saturation magnetic flux density of crystal grains, and the grain boundary resistivity is improved. And finally, the high-frequency and high-Bs composite ferrite material is prepared.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a composite ferrite material and a preparation process thereof. Background technique [0002] With the miniaturization of electronic equipment, the application of soft magnetic materials is also developing in the direction of high frequency, high Bs and low loss. On the one hand, with the market demand for smaller, lighter and thinner electronic equipment, in order to reduce the volume (weight) of the magnetic circuit, the magnetic core is required to be processed at high frequency (1~10MHz) and high magnetic flux density When large signal or power transmission occurs, lower energy loss occurs, that is, soft ferrite materials with higher magnetic permeability and lower power loss at higher frequencies (1~10MHz) are required; on the other hand, in many circuits In addition to the alternating current (AC) component, it has to be compatible with the large direct current ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/64H01F1/34
CPCC04B35/2658C04B35/265C04B35/64H01F1/344C04B2235/3284C04B2235/3279C04B2235/3262C04B2235/3298C04B2235/3281C04B2235/3256C04B2235/3251C04B2235/3244C04B2235/3232C04B2235/3275C04B2235/3208C04B2235/5445C04B2235/661C04B2235/85
Inventor 李赟聂建文张芹邢冰冰张志新张晋康
Owner TDG HLDG CO LTD
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