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A kind of high frequency high BS composite ferrite material and its preparation method

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 cost

Active Publication Date: 2022-05-10
TDG HLDG CO LTD
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  • Summary
  • 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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  • A kind of high frequency high BS composite ferrite material and its preparation method

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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, the preparation method of which is 1) preparing pre-fired materials of manganese-zinc ferrite and nickel-zinc ferrite respectively, and 2) sanding them separately and adding auxiliary components; 3) Carry out secondary pre-firing respectively; 4) Manganese-zinc micron-sized magnetic powder and nickel-zinc nano-sized magnetic powder are prepared by sand milling and high-energy ball milling respectively; 5) Mixed uniformly in a sand mill and then pressed into shape; 6) In an atmosphere furnace medium sintering. In the present invention, through the formula design of the main component, auxiliary component, flux and other doping components, combined with the process design of secondary pre-firing, sand milling, high-energy ball milling, and mixing, the inner layer is finally formed. 4 The outer layer is NiZnFeO 4 The grain-shell structure, the outer layer of NiZnFeO 4 The structure increases the grain boundary resistivity, and the inner layer of MnZnFeO 4 The structure increases the saturation magnetic flux density of the crystal grains, and finally a composite ferrite material with high frequency and high Bs 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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Patent Type & Authority Patents(China)
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