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A kind of soft magnetic composite material and preparation method thereof

A soft magnetic composite material, control ball technology, applied in the direction of magnetic materials, magnetic objects, metal processing equipment, etc., can solve the problems of reduced magnetic properties, low saturation magnetization, etc., to achieve the effect of increasing resistivity

Active Publication Date: 2017-12-08
湖州航磁电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But γ´-Fe 4 The saturation magnetization of N is slightly lower than that of α-Fe, and the γ´-Fe prepared after nitriding 4 The magnetic properties of the N material are reduced to a certain extent compared with the α-Fe before nitriding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The steps are:

[0037] 1) Material preparation

[0038] The atomized iron powder with an average particle size of 2μm is selected as the raw material;

[0039] 2) Ball mill flattening

[0040] Put the iron powder into the ball mill tank, choose the ratio of ball to material to be 5:1, choose n-hexane as the medium, control the speed of the ball mill to be 600r / min, and control the ball milling time to be 0.1h to obtain flake iron powder with good flattening effect;

[0041] 3) Surface nitriding

[0042] Take out the flattened iron powder, put it in the heat treatment furnace, pass H 2 and NH 3 mixture of gases, where H 2 and NH 3 The molar ratio is 1:1; after the air is completely exhausted, the temperature is raised to 450°C at a rate of 5°C / min; the temperature is kept for 10h;

[0043] 4) Preparation of soft magnetic composites

[0044] The nitrided iron powder was added with 0.1wt.% W-6C adhesive, and the soft magnetic composite magnetic ring was made under...

Embodiment 2

[0049] The steps are:

[0050] 1) Material preparation

[0051] The hydroxy iron powder with an average particle size of 8 μm is selected as the raw material;

[0052] 2) Ball mill flattening

[0053] Put the iron powder into the ball mill tank, choose the ratio of ball to material to be 10:1, choose n-hexane as the medium, control the speed of the ball mill to be 500r / min, and control the ball milling time to be 0.5h to obtain flake iron powder with good flattening effect;

[0054] 3) Surface nitriding

[0055] Take out the flattened iron powder, put it in the heat treatment furnace, pass H 2 and NH 3 mixture of gases, where H 2 and NH 3 The molar ratio is 1:1; after the air is completely exhausted, the temperature is raised to 500°C at a rate of 5°C / min; the temperature is kept for 5h;

[0056] 4) Preparation of soft magnetic composites

[0057] Adding 0.5wt.% W-6C binder to the iron powder after nitridation, and making a soft magnetic composite magnetic ring under t...

Embodiment 3

[0062] The steps are:

[0063] 1) Material preparation

[0064] Select reduced iron powder with an average particle size of 20μm as raw material;

[0065] 2) Ball mill flattening

[0066] Put the iron powder into the ball mill tank, choose the ratio of ball to material to be 15:1, choose anhydrous ethanol as the medium, control the speed of the ball mill to be 500r / min, and control the ball milling time to be 1h to obtain flake iron powder with good flattening effect;

[0067] 3) Surface nitriding

[0068] Take out the flattened iron powder, put it in the heat treatment furnace, pass H 2 and NH 3 mixture of gases, where H 2 and NH 3 The molar ratio is 2:1; after the air is completely exhausted, the temperature is raised to 550 °C at a rate of 5 °C / min; the temperature is kept for 2 h;

[0069] 4) Preparation of soft magnetic composites

[0070] The nitrided iron powder was added with 1wt.% W-6C adhesive, and the soft magnetic composite magnetic ring was made under the ...

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Abstract

The invention relates to a soft magnetic composite material with a composite structure. The composite soft magnetic material is composed of flaky magnetic particles, and the flaky magnetic particles are composed of a core-shell structure of α-Fe and γ´-Fe4N. Covering the inner α-Fe phase, this structure improves the resistivity and corrosion resistance of the particles, and the sheet structure greatly reduces the eddy current loss at high frequencies. The invention adopts the method of ball milling to obtain flake iron powder with good flattening effect; then nitriding the flattened iron powder in a mixed atmosphere of H2 and NH3; making the nitrided iron powder into a soft magnetic composite magnetic ring; Finally, an annealing heat treatment is performed. This method effectively increases the surface area of ​​iron powder per unit volume by flattening the iron powder, which is beneficial to nitriding; at the same time, the iron powder after ball milling has larger internal stress and more defects, which is also conducive to nitrogen penetration; the surface γ The composite structure of ´‑Fe4N and internal α‑Fe is beneficial to the improvement of the resistivity of soft magnetic materials.

Description

technical field [0001] The invention relates to a soft magnetic composite material and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] Soft magnetic materials refer to ferromagnetic and ferrimagnetic materials that are easily magnetized and demagnetized. Because of its low coercivity and high magnetic permeability, soft magnetic materials are widely used in electrical equipment and electronic equipment, and are especially suitable for cores of inductance coils, transformers, relays and motors. [0003] Soft magnetic materials mainly include metal and alloy soft magnetic, ferrite soft magnetic and amorphous nanocrystalline soft magnetic. Among them, the characteristics of metal and alloy soft magnetism are: high saturation magnetization, high energy storage; but low resistivity, when used at high frequencies, the loss is large. However, the current electromagnetic devices have higher and higher requirements for hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147B22F1/00B22F3/02B22F3/24
CPCH01F1/14716B22F3/02B22F3/24B22F2003/248B22F1/145
Inventor 彭晓领李静杨艳婷徐靖才王攀峰洪波金红晓金顶峰王新庆葛洪良
Owner 湖州航磁电子有限公司
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