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Preparation method for ferrite, ferrite and inductor

A technology of ferrite and nickel oxide, applied in the direction of transformer/inductor core, etc., can solve the problem of ferrite's weak resistance to current impact

Active Publication Date: 2016-07-20
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the ability of ferrite to resist current shock is weak

Method used

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  • Preparation method for ferrite, ferrite and inductor
  • Preparation method for ferrite, ferrite and inductor
  • Preparation method for ferrite, ferrite and inductor

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preparation example Construction

[0024] The preparation method of ferrite will be further described in detail mainly in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the method for preparing ferrite according to one embodiment includes the following steps S110-S160.

[0026] S110, providing pre-fired ingredients, the pre-fired ingredients include iron oxide, nickel oxide, zinc oxide, copper oxide and tricobalt tetroxide.

[0027] By iron oxide (Fe 2 o 3 ) by adding nickel oxide (Ni 2 o 3 ), zinc oxide (ZnO) and copper oxide (CuO) can be used to prepare NiCuZn soft magnetic ferrite, which has a high initial permeability and can be used for high-current inductors. Further add tricobalt tetroxide (Co 3 o 4 ), the resistance of the ferrite can be increased by cobalt tetroxide, thereby enhancing the ability of the ferrite to resist current impact.

[0028] Iron oxide, nickel oxide, zinc oxide, copper oxide and cobalt tetroxide are all commercially available. In this embod...

Embodiment 1

[0072] (1) Weigh the materials according to the following ratio (unit: g, tolerance: ±10%)

[0073] Material

Fe 2 o 3

Ni 2 o 3

ZnO

CuO

co 3 o 4

Deionized water

Zirconium ball

weight

62.77

8.44

19.67

9.02

0.10

100

400

[0074] The diameter of zirconium balls is 7mm, the mass ratio of pre-fired ingredients: balls: water is 1:4:1, the speed is 350 rpm, and ball milling is carried out for 4 hours. After discharging, drying, and passing through a 60-mesh sieve, put it in a mullite crucible, and prepare for pre-firing synthesis.

[0075] (2) Pre-fired synthesis

[0076] Pre-burning equipment: box furnace

[0077] Heating curve: starting from room temperature, the temperature is raised to 830°C at a rate of 2.5°C / min;

[0078] Heat preservation: keep heat at 830°C for 2.5 hours, close the box furnace, and cool the pre-fired powder to room temperature with the furnace.

[0079] (3) Weigh ...

Embodiment 2

[0090] (1) Weigh the materials according to the following ratio (unit: g, tolerance: ±10%)

[0091] Material

Fe 2 o 3

Ni 2 o 3

ZnO

CuO

co 3 o 4

Deionized water

Zirconium ball

weight

64.18

7.35

19.63

8.75

0.09

100

400

[0092] The diameter of zirconium balls is 7mm, the mass ratio of pre-fired ingredients: balls: water is 1:4:1, the speed is 350 rpm, and ball milling is carried out for 4 hours. After discharging, drying, and passing through a 60-mesh sieve, put it in a mullite crucible, and prepare for pre-firing synthesis.

[0093] (2) Pre-fired synthesis

[0094] Pre-burning equipment: box furnace

[0095] Heating curve: starting from room temperature, the temperature is raised to 855°C at a rate of 2.5°C / min;

[0096] Heat preservation: keep heat at 855°C for 2.5 hours, close the box furnace, and cool the pre-fired powder to room temperature with the furnace.

[0097] (3) Weigh ...

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Abstract

The invention discloses a preparation method for a ferrite, the ferrite prepared by the method and an inductor which comprises the ferrite. A crystal grain structure is formed by adding raw materials in batches and ball-milling, pre-sintering and synthesizing the main materials, such as iron oxide, nickel oxide, zinc oxide, copper oxide and cobaltosic oxide. Later, bismuth oxide, silicon dioxide and yttrium oxide are added into a pre-sintered powder material; the yttrium oxide can enter the pre-sintered and synthesized zinc oxide crystal grains, so that the density of the ferrite is improved, and the current impact resistance of the ferrite is improved. The prepared ferrite crystal grains are small; the crystal grain uniformity is high; the magnetic conductance change rate is low. According to the inductor which comprises the ferrite, the inductance value of the inductor is reduced slightly along with the increase of a superimposed current.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of ferrite, ferrite and inductor. Background technique [0002] Ferrite has a wide range of applications in home appliances, automobiles, electronic equipment, communications, medical, aerospace, military and other fields. Ferrites are mostly NiCuZn soft ferrite, and their common initial permeability are 25H / m (Henry / meter), 100H / m (Henry / meter), 200H / m (Henry / meter) and 400H / m (Henry / meter) and other materials, generally, materials with an initial magnetic permeability of about 100H / m (Henry / meter) can be used for high-current inductors. [0003] However, the traditional method is generally to mix all the raw materials uniformly and then sinter the ferrite. When this type of ferrite is used in high-current inductors, especially multilayer power inductors, the inductance value of the inductor drops greatly as the superimposed current increases. ...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622H01F27/24
CPCC04B35/2675C04B35/622C04B2235/3277C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3298C04B2235/3418H01F27/24
Inventor 蒋留华周庆波李强陈志华徐建平
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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