Magnetic core material, and preparation method and application thereof

A magnetic core material and magnetic technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of poor repression and high loss of high-impedance iron-silicon-chromium materials

Active Publication Date: 2021-05-07
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-impedance iron-silicon-chromium material has poor compressibility, there is a risk of short circuit under high pressure, and the loss is also high, so there is still a large room for optimization

Method used

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  • Magnetic core material, and preparation method and application thereof
  • Magnetic core material, and preparation method and application thereof
  • Magnetic core material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] This embodiment provides a magnetic core material and a preparation method thereof, the preparation method comprising the following steps:

[0099] (1) Mixing the first magnetic powder, the second magnetic powder and the third magnetic powder with a mass ratio of 7:2:1 to obtain a ternary magnetic powder; wherein the first magnetic powder is Fe 77.1 Si 1 B 6 P 5.5 C 4.5 Ni 2 Cr 3 Cu 0.5 Nb 0.1 V 0.1 mn 0.1 Zn 0.1 , the particle size distribution is D10=3.5 μm, D50=13.5 μm, D90=30 μm; the second magnetic powder is aerosolized FeSi powder, the particle size distribution is D10=1.25 μm, D50=4 μm, D90=8 μm; the third magnetic powder is Carbonyl iron powder, the particle size distribution is D10=1.5μm, D50=3.5μm, D90=6μm;

[0100] (2) Mixing ternary magnetic powder, phosphoric acid and acetone, stirring until the acetone is completely volatilized, followed by drying, grinding, sieving and baking to obtain passivated magnetic powder; the phosphoric acid accounts fo...

Embodiment 2

[0105] This embodiment provides a magnetic core material and a preparation method thereof, the preparation method comprising the following steps:

[0106] (1) Mixing the first magnetic powder, the second magnetic powder and the third magnetic powder with a mass ratio of 6:3:1 to obtain a ternary magnetic powder; wherein the first magnetic powder is Fe 60 Si 2 B 10 P 6 C 6 Ni 4 Cr 5 Cu 1.5 Nb 1.5 V 1.5 mn 1.5 Zn 1 , the particle size distribution is D10=3μm, D50=12μm, D90=25μm; the second magnetic powder is aerosolized FeNi powder, the particle size distribution is D10=0.5μm, D50=2μm, D90=6μm; the third magnetic powder is reduced iron powder, the particle size distribution is D10=1μm, D50=3μm, D90=5μm;

[0107] (2) Mixing ternary magnetic powder, phosphoric acid and acetone, stirring until the acetone is completely volatilized, followed by drying, grinding, sieving and baking to obtain passivated magnetic powder; the phosphoric acid accounts for 0.1% of the mass of t...

Embodiment 3

[0112] This embodiment provides a magnetic core material and a preparation method thereof, the preparation method comprising the following steps:

[0113] (1) Mixing the first magnetic powder, the second magnetic powder and the third magnetic powder with a mass ratio of 6.5:2.5:1 to obtain a ternary magnetic powder; wherein the first magnetic powder is Fe 80 Si 1.5 B 5 P 3 C 5 Ni 0.5 Cr 4 Cu 1, the particle size distribution is D10=4μm, D50=15μm, D90=35μm; the second magnetic powder is gas atomized FeSiAl powder, the particle size distribution is D10=2μm, D50=6μm, D90=10μm; the third magnetic powder is water atomized FeSiCr powder, the particle size distribution is D10=2μm, D50=4μm, D90=7μm;

[0114] (2) Mix the ternary magnetic powder, phosphoric acid and acetone, and stir until the acetone is completely volatilized, followed by drying, grinding, sieving and baking to obtain the passivated magnetic powder; the phosphoric acid accounts for 0.3% of the mass of the ternar...

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Abstract

The invention provides a magnetic core material, and a preparation method and an application thereof. The magnetic core material comprises a first magnetic powder, a second magnetic powder and a third magnetic powder which are bonded and mixed by a binder. The preparation method comprises the following steps: (1) mixing the first magnetic powder, the second magnetic powder and the third magnetic powder to obtain a ternary magnetic powder; (2) passivating the ternary magnetic powder obtained in the step (1) to obtain a passivated magnetic powder; (3) coating the passivated magnetic powder obtained in the step (2) to obtain a coated magnetic powder; (4) bonding and granulating the coated magnetic powder obtained in the step (3) to obtain magnetic particles; and (5) carrying out compression molding on the magnetic particles obtained in the step (4) to obtain the magnetic core material. The magnetic core material provided by the invention has the characteristics of low forming pressure, high magnetic conductivity and low loss, and the short-circuit risk of a molded inductor is reduced.

Description

technical field [0001] The invention belongs to the technical field of molded inductors, and relates to a magnetic core material, in particular to a magnetic core material and a preparation method and application thereof. Background technique [0002] Molded inductors are also called one-piece molded inductors because of their integrated molding. Compared with conventional wire-wound glue-coated inductors, their magnetic circuit distribution is more uniform, their effective permeability is higher, their losses are lower, and their saturation current is better. The zero-processing feature of the magnet after forming is being more and more widely used in the fields of automotive electronics, DC / DC conversion modules and 3C consumer electronics. However, due to the fact that the coil is buried in the powder and pressed together with the powder, the coil is easily punctured by the powder during the pressing process, and there is a risk of short circuit. Therefore, the spherical ...

Claims

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Application Information

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IPC IPC(8): H01F1/047H01F41/02
CPCH01F1/047H01F41/0246
Inventor 方萌杜阳忠卢军伟娄海飞赵旭
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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