Iron-silicon-aluminum-ferrite composite magnetic core and preparation method therefor

A technology of ferrite core and sendust, which is applied in transformer/inductor core, inductance/transformer/magnet manufacturing, inorganic material magnetism, etc., can solve the problem that switching power supply devices are vulnerable to damage and reactive power consumption increase, switching loss and other issues, to achieve the effect of improving the power factor of the power supply, reducing transient loss, and reducing current distortion

Inactive Publication Date: 2017-05-10
JIANGXI AITE MAGNETS
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, the PFC inductor is mainly designed for more than 50% load, and it is difficult to play a role under light load; at the same time, PFC will generate a sudden large current in the intermittent operation mode or under the condition of inductive load, which will cause the switching power supply device to be easily damaged. Increased switching loss and increased reactive power consumption make it difficult to ensure the improvement of power supply efficiency
[0004] In order to improve the problems existing in conventional PFC inductors, there is an urgent need for a magnetic core with high magnetic permeability and large current unsaturation capability; however, the existing magnetic powder core is made of various soft magnetic alloy powders, so it has countless uniformly distributed Small air gap, which determines that the existing magnetic powder core has a strong anti-saturation ability, that is, it has unsaturated characteristics under high current, but also because of the distributed air gap, the magnetic permeability is low, generally not more than 200

Method used

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  • Iron-silicon-aluminum-ferrite composite magnetic core and preparation method therefor
  • Iron-silicon-aluminum-ferrite composite magnetic core and preparation method therefor

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preparation example Construction

[0030] The present invention also provides a method for preparing the sendust-ferrite composite magnetic core described in the above technical solution, comprising the following steps:

[0031] (1) Mixing the sendust powder and the insulating coating agent to obtain a mixed material;

[0032] (2) Molding the mixed material obtained in the step (1) with the ferrite core to obtain a green body; said molding makes the mixed material coated on the surface of the ferrite core;

[0033] (3) preheating the green body obtained in the step (2) and then annealing to obtain a sendust-ferrite composite magnetic core.

[0034]The invention mixes the sendust aluminum alloy powder and the insulating coating agent to obtain the mixed material. In the present invention, the mixing temperature is preferably 15-130°C, more preferably 20-120°C, more preferably 40-100°C, most preferably 80-90°C; in the present invention, the mixing The speed is preferably 5-60r / min, more preferably 15-55r / min, m...

Embodiment 1

[0044] Mix 300-mesh sendust aluminum powder with a weight of 29.6 grams, 0.2 g phosphoric acid and 0.2 g sodium silicate at room temperature for 10 minutes at a mixing rate of 5 to 60 r / min to obtain a mixed material; wherein the sendust aluminum powder has a chemical composition of Iron 87.8%, silicon 6.8% and aluminum 5.4%.

[0045] Put 12g of the mixed material into the mold of OD33.02mm×ID19.90mm×HT15mm, and then put the nickel-zinc ferrite powder core with the mass of 3g and the size of OD30mm×ID25mm×HT3mm into the mold, and the mass of nickel-zinc The ratio is 0.4:0.6, and finally put the remaining 18g of mixed material into the mold, and the pressure reaches 21T / cm 2 Hold for 10s at the same time, and the green body is obtained by ejecting the mold;

[0046] The green body was preheated at 200°C for 50 minutes under the condition of vacuum degree of 0.08Pa to obtain the sendust-ferrite composite magnetic core precursor;

[0047] Under the same vacuum condition, keep t...

Embodiment 2

[0049] Mix 200 meshes of sendust powder with a weight of 28.4 grams, 0.8 g of tetraethyl orthosilicate and 0.8 g of zinc stearate at a speed of 60 r / min at 80°C for 10 minutes to obtain a mixed material; the sendust powder The chemical composition of iron is 87.8%, silicon 6.8% and aluminum 5.4%.

[0050] Put 20g of the mixed material into the mold of OD33.02mm×ID19.90mm×HT15mm, then put 3g of manganese zinc ferrite core with the size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining 10g of the mixed material Put it into the mold, pressurize 20T / cm 2 Hold for 15s, withdraw from the mold, and obtain the green body;

[0051] In the condition of nitrogen gas with a flow rate of 5L / min, after preheating at 250°C for 80 minutes, in the same atmosphere, annealing at 680°C for 80 minutes to obtain a sendust-ferrite composite core.

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Abstract

The invention provides an iron-silicon-aluminum-ferrite composite magnetic core. The iron-silicon-aluminum-ferrite composite magnetic core is prepared from the following raw materials based on mass percentages by pressing and heat treatment in sequence: 80-99% of iron-silicon-aluminum alloy powder, 0.5-8% of insulating coating agent and the balance of ferrite magnetic core; and the iron-silicon-aluminum alloy powder, the surface of which is coated with the insulating coating agent, is arranged on the surface of the ferrite magnetic core in a coating manner. According to the iron-silicon-aluminum-ferrite composite magnetic core provided by the invention, the high-current un-saturation capability of the iron-silicon-aluminum alloy and the high magnetic conductivity performance of the ferrite composite magnetic core are given into full play, and the problem of transient state current distortion of a low-impedance high-switching current is solved; the embodiment result proves that the initial magnetic conductivity is improved by virtue of the composite magnetic core; and when the magnetic field strength is 0.2(Oe), the magnetic conductivity of the iron-silicon-aluminum-ferrite composite magnetic core can reach 10,000 which is far higher than the initial magnetic conductivity of an iron-silicon-aluminum magnetic core 59 under the same condition and is 166 times of the magnetic conductivity of a ferrite magnetic core in the prior art.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a sendust-ferrite composite magnetic core and a preparation method thereof. Background technique [0002] Switching power supply is an inseparable electrical equipment in our daily life. Rectifiers, capacitors, and inductance circuits form an energy storage component of a nonlinear group. However, the nonlinearity of the load will cause severe distortion of the current input waveform, which in turn will lead to a decrease in power supply efficiency. The PFC inductor, as a key component of the switching power supply, realizes the adjustment of the phase difference between the current and the voltage, thereby alleviating the problem of low power supply efficiency caused by the current distortion caused by the rectification process. [0003] However, the PFC inductor is mainly designed for more than 50% load, and it is difficult to play a role under light load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F27/24H01F27/255H01F41/02
Inventor 毛圣华张勉团皮金斌
Owner JIANGXI AITE MAGNETS
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