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High-frequency low-magnetic-loss power type soft magnetic composite material and preparation method thereof

A soft magnetic composite material and composite material technology, applied in the field of magnetic material preparation, can solve the problems of material magnetic properties decline, insulation coating damage, coating damage, etc., to simplify the material preparation process, reduce eddy current loss, and simple craftsmanship

Pending Publication Date: 2020-11-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing method of preparing soft magnetic composite materials is mainly powder metallurgy, that is, first coat one or more insulating coating layers on the surface of ferromagnetic powder by physical or chemical methods, and then put the powder under certain temperature and pressure. Compression molding, because internal stress will be generated inside the magnetic core during the pressing process, resulting in a decrease in the magnetic properties of the material, so annealing at 500-650 ° C is required to eliminate the internal stress generated during the pressing process
There are two problems in this kind of preparation method: (1) in the pressing process, the pressing pressure is too large and the insulating coating will be damaged; the pressing pressure is too small and the gap between the particles is larger
Regardless of whether the cladding layer is damaged or there is a large gap between the particles, the magnetic loss of the material will increase.
(2) For organic coating materials, most organic substances have low temperature resistance. At an annealing temperature of 500-650°C, the organic coating layer will decompose, thereby destroying the coating layer, resulting in increased magnetic loss

Method used

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  • High-frequency low-magnetic-loss power type soft magnetic composite material and preparation method thereof
  • High-frequency low-magnetic-loss power type soft magnetic composite material and preparation method thereof
  • High-frequency low-magnetic-loss power type soft magnetic composite material and preparation method thereof

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preparation example Construction

[0029] A kind of preparation method of the power type soft magnetic composite material of high frequency and low magnetic loss of the present invention, described method comprises the following steps:

[0030] 1) Preparation of slurry

[0031] Weigh according to the components and proportions required by the above composite materials, stir and mix first; then place in a ball mill and vibrate for 5-10 minutes at a speed of 200-400r / min to make it evenly mixed to obtain a magnetic slurry with good fluidity ;

[0032] 2) Molding

[0033] The magnetic slurry obtained in step 1) is poured into the mold, so that the slurry is evenly distributed in the mold, and because the slurry has good fluidity, it can fill up every corner of the mold;

[0034] 3) curing

[0035] In order to solidify the slurry, it needs to be heated so that the polymer polymerizes to form a solid magnetic core. The heating curve is as follows figure 1 As shown, the temperature rise rate is 3-5°C / min, in orde...

Embodiment 1

[0038] A power type soft magnetic composite material with high frequency and low magnetic loss. The components included in the composite material and the parts by weight of each component are as follows:

[0039]

[0040] Described preparation method comprises the following steps:

[0041] 1) Preparation of slurry

[0042] Weigh 3g of TMPTA, 28g of 500μm NiZn ferrite flake powder and 66g of 20μm permalloy spherical powder, as well as 1.5g of DBP and 1.5g of acetone, and first stir and mix by hand. Then place it in a ball mill and vibrate for 5 minutes at a speed of 400 r / min to make it evenly mixed to obtain a magnetic slurry with good fluidity.

[0043] 2) Molding

[0044] The magnetic slurry obtained in step 1) is poured into the annular magnetic core mold, so that the slurry is evenly distributed in the mold and fills up every corner of the mold.

[0045] 3) curing

[0046]The mold was heated to 180°C, the heating rate was 3°C / min, and the temperature was kept for 70...

Embodiment 2

[0049] A power type soft magnetic composite material with high frequency and low magnetic loss. The components included in the composite material and the parts by weight of each component are as follows:

[0050]

[0051]

[0052] Described preparation method comprises the following steps:

[0053] 1) Preparation of slurry

[0054] Weigh 3.5g of TMPTA, 39g of 300μm NiZn ferrite flake powder and 55g of 15μm permalloy spherical powder, as well as 1.5g of DBP and 1.5g of acetone, and first stir and mix manually. Then place it in a ball mill and vibrate for 8 minutes at a speed of 300 r / min to make it evenly mixed to obtain a magnetic slurry with good fluidity.

[0055] 2) Molding

[0056] The magnetic slurry obtained in step 1) is poured into the annular magnetic core mold, so that the slurry is evenly distributed in the mold and fills up every corner of the mold.

[0057] 3) curing

[0058] The mold was heated to 190°C, the heating rate was 4°C / min, and the temperature...

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Abstract

The invention relates to a high-frequency low-magnetic-loss power type soft magnetic composite material and a preparation method thereof. The preparation method comprises the steps: mixing trimethylolpropane triacrylate, NiZn ferrite flaky powder, permalloy spherical powder, dibutyl phthalate and acetone, vibrating in a ball mill to prepare magnetic slurry with good fluidity, injecting the slurryinto a mold, heating, curing, cooling, and demolding to obtain a soft magnetic composite material magnetic core. NiZn ferrite belongs to metal oxide and is high in resistivity, so that the eddy current loss of the soft magnetic composite material at high frequency can be remarkably reduced, the soft magnetic composite material is suitable for megahertz-level high-frequency application, and the loss of the soft magnetic composite material can be reduced by 33% compared with that of a commercial magnetic core. Compared with a traditional powder metallurgy preparation process, the preparation process provided by the invention can be carried out under the conditions of low temperature and no pressure, only the curing temperature lower than 200 DEG C is needed, and external pressure is not needed to apply in the curing process, so that the material preparation process is greatly simplified.

Description

technical field [0001] The invention relates to a power type soft magnetic composite material with high frequency and low magnetic loss and a preparation method thereof, belonging to the field of magnetic material preparation, in particular to a power type soft magnetic composite material with high frequency and low magnetic loss and a preparation method thereof. Background technique [0002] Soft Magnetic Composite Materials (SMCs) is a new type of soft magnetic material developed in recent years. Its appearance is mainly to solve the problem of excessive loss of soft magnetic materials in high frequency applications. The loss of soft magnetic material can be expressed by the following formula: [0003] [0004] Among them, is W e Eddy current loss, W h is the hysteresis loss, f is the frequency, B m is the excitation flux density, ρ is the core resistivity, t is the thickness of the magnetic material, k 1 and k 2 are the magnetic powder weight and volume coefficien...

Claims

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Application Information

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IPC IPC(8): H01F1/24H01F1/26H01F1/34H01F41/02
CPCH01F1/26H01F1/24H01F1/344H01F41/02
Inventor 梅云辉姚晓艳王美玉李欣
Owner TIANJIN UNIV