A kind of preparation method of high magnetic permeability flaky soft magnetic alloy powder

A technology of soft magnetic alloy and high magnetic permeability, which is applied in the field of composite material manufacturing, can solve the problems of reduced yield, complicated production process, and insufficient flattening of magnetic powder, and achieves improved plastic deformation ability, high oxidation resistance, and effective Favorable effect on magnetic permeability

Active Publication Date: 2018-02-13
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the end, part of the magnetic powder cannot be fully flattened, and the diameter and thickness are relatively low, which cannot meet the requirements of high magnetic permeability.
Most of the magnetic powder prepared by the traditional process cannot meet the requirements. Generally, the proportion of magnetic powder with a diameter-thickness ratio greater than 50:1 does not exceed 40%, while the proportion of magnetic powder with a diameter-thickness ratio greater than 100:1 is even less than 10%, which greatly reduces Yield
CN 103350225 A discloses a multi-stage rod milling method for flattening soft magnetic alloy magnetic powder. This method can increase the diameter-thickness ratio of the magnetic powder and improve the yield, but the production process is complicated and requires multi-stage ball milling. Long time ball milling, low production efficiency
CN 104249155 A discloses a multi-stage ball milling method. Compared with the traditional process, the flattening rate of the magnetic powder has been significantly improved. However, in the process, multi-stage ball milling is required, the ball milling time is long, and the production efficiency is low. At the same time, the process The parameters need to be precisely controlled, and improper regulation will seriously affect the flattening rate of magnetic powder
[0007] In summary, the existing soft magnetic alloy magnetic powder flattening process has problems such as small diameter-thickness ratio, low yield, and low production efficiency.

Method used

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  • A kind of preparation method of high magnetic permeability flaky soft magnetic alloy powder
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  • A kind of preparation method of high magnetic permeability flaky soft magnetic alloy powder

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of high magnetic permeability flaky soft magnetic alloy powder, comprising the following steps:

[0032] (1) Raw material selection: block Fe-Si-Al magnetic powder is selected as the raw material for ball milling, the particle size is 80-100 μm, the average particle size is 90 μm, and the solvent is absolute ethanol;

[0033] (2) Primary ball milling: Put the magnetic powder, solvent (absolute ethanol) and grinding balls in the step (1) into a sand mill for primary ball milling, the mass ratio of magnetic powder, absolute ethanol and grinding balls is 1:3 : 20, stainless steel balls with a diameter of 3 to 6 mm, the speed of the sand mill is 160 rpm, and the milling time is 6 hours. Put the magnetic powder in an oven for drying treatment at 80°C for 2 hours, the solvent evaporates completely.

[0034] (3) Primary reduction treatment: put the round cake-shaped magnetic powder in step (2) into a high-temperature annealing furnace for primary reductio...

Embodiment 2

[0050] Step 1: Select block Fe-Ni-Mo magnetic powder as the raw material for ball milling, with a particle size of 20-80 μm and an average particle size of 40 μm.

[0051] Step 2: Put the magnetic powder, solvent (absolute ethanol) and grinding balls in step 1 into a planetary ball mill for primary ball milling. The mass ratio of magnetic powder, absolute ethanol and grinding balls is 1:2:10, and the diameter of the grinding balls is For stainless steel balls of 3-6 mm, the speed of the ball mill is 200 rpm, and the milling time is 2 hours. Put the magnetic powder into an oven for drying treatment at 100°C for 1.5 hours, and the solvent is completely evaporated.

[0052] Step 3: Put the round cake-shaped magnetic powder in step 2 into a high-temperature annealing furnace for primary reduction annealing. The annealing atmosphere is a mixture of hydrogen and argon. The annealing temperature is 400°C, the holding time is 60 minutes, and the pressure in the furnace is 0.2 MPa;

...

Embodiment 3

[0061] Step 1: select spherical Fe-Ni magnetic powder as the raw material for ball milling, with a particle size of 80-150 μm and an average particle size of 120 μm.

[0062] Step 2: Put the magnetic powder, solvent (absolute ethanol) and grinding balls in step 1 into a planetary ball mill for primary ball milling. The mass ratio of magnetic powder, absolute ethanol and grinding balls is 1:4:30, and the diameter of the grinding balls is For stainless steel balls of 3-6 mm, the speed of the ball mill is 250 rpm, and the milling time is 1 hour. Put the magnetic powder into an oven for drying treatment, the drying temperature is 90°C, and the drying time is 1.5 hours, and the solvent is completely evaporated.

[0063] Step 3: Put the round cake-shaped magnetic powder in step 2 into a high-temperature annealing furnace for primary reduction annealing treatment. The annealing atmosphere is a mixture of hydrogen and argon. The annealing temperature is 800°C, and the holding time is ...

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Abstract

The invention discloses a preparation method of high magnetic permeability flaky soft magnetic alloy powder, which is characterized in that it comprises the following steps: (1), raw material selection: select soft magnetic alloy magnetic powder that can be used for absorbent, and the shape is not limited , select solvent; (2), primary ball milling; (3), primary reduction treatment; (4), secondary ball milling; (5), classification: by air classification technology, the magnetic powder in step (4) is carried out particle size classification, respectively Screen out the magnetic powder whose diameter-to-thickness ratio is less than 50:1, between (50:1) and (100:1), and greater than 100:1; (6), secondary reduction annealing treatment; (7), dispersion treatment. The invention has the characteristics of simple manufacturing process, low manufacturing cost, high yield, large diameter-thickness ratio, high magnetic permeability and the like.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, and in particular relates to a preparation method of sheet-like soft magnetic alloy powder with high magnetic permeability. Background technique [0002] With the rapid development of electronic information technology, electronic products and communication equipment with integrated circuits as the main body have entered various fields of society. However, while these electronic products bring many conveniences to people, they also bring certain problems. For example, electromagnetic radiation pollution has become more and more serious, seriously affecting people's normal work and life. On the other hand, electronic products and communication equipment are developing toward miniaturization, intelligence, and high integration, and the problem of electromagnetic interference inside the equipment is becoming more and more prominent. Electromagnetic wave absorbing materials can solve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00H01F1/20
CPCH01F1/20B22F9/04B22F2009/043B22F2009/042B22F1/142
Inventor 刘立东叶怡婷郝斌刘克霞
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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