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

A ferrite core and ferrite technology, applied in the direction of magnetic core/yoke, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of easy damage of switching power supply devices, increased reactive power consumption, switching Increased loss and other issues to achieve the effect of improving the power factor of the power supply, solving transient current distortion, and reducing transient loss

Active Publication Date: 2017-03-15
JIANGXI AITE MAGNETS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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; 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 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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Examples

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preparation example Construction

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

[0031] (1) mixing the iron-silicon alloy powder with an 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;

[0033] (3) Preheating the green body obtained in the step (2) and then annealing to obtain an iron-silicon-ferrite composite magnetic core.

[0034] The invention mixes the iron-silicon alloy powder with 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, more preferably 20-40r / min, most preferably 30r / min; in the pr...

Embodiment 1

[0043] 300 meshes of iron-silicon alloy powder with a weight of 28 grams, 1 g of phosphoric acid and 1 g of sodium silicate were mixed at room temperature for 10 minutes at a mixing rate of 5 to 60 r / min to obtain a mixed material; wherein the chemical composition of the iron-silicon alloy powder was Si 6.5% and The balance of Fe.

[0044] Put 12g of the mixed material into the mold of OD33.02mm×ID19.90mm×HT15mm, then put the nickel-zinc ferrite core with the mass of 3g and the size of OD30mm×ID25mm×HT3mm into the mold, and finally put the remaining Put 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;

[0045] The green body is preheated at 200°C for 50 minutes under the condition of vacuum degree of 0.08Pa to obtain the iron-silicon-ferrite composite magnetic core precursor;

[0046] Under the same vacuum condition, keep the temperature at 700°C for 60 minutes, and cool...

Embodiment 2

[0048] Mix 200-mesh iron-silicon alloy powder with a weight of 28.9 grams, 0.3 g tetraethyl orthosilicate and 0.8 g zinc stearate at a rate of 60 r / min at 80 ° C for 10 minutes to obtain a mixed material; the chemical composition of the iron-silicon alloy powder The composition is Si 6.5% and the balance Fe.

[0049] 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;

[0050] In the condition of nitrogen 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 FeSi-Ferrite composite magnetic core.

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Abstract

The invention provides an iron-silicon-ferrite composite magnetic core. The iron-silicon-ferrite composite magnetic core is prepared from the following raw materials based on mass percentage through pressing and thermal treatment in sequence: 80-99% of iron-silicon alloy powder, 0.5-8% of insulating coating agent and the balance of ferrite magnetic core, wherein the iron-silicon alloy powder, the surface of which is coated with the insulating coating agent, coats the surface of the ferrite magnetic core. By adoption of the iron-silicon-ferrite composite magnetic core provided by the invention, the high-current unsaturated capability of the iron-silicon alloy and the high magnetic conductivity of the ferrite magnetic core can be made into full play, so that the problem of transient state current distortion of a low-impedance high switching current is solved; the result of the embodiment proves that the initial magnetic conductivity of the composite magnetic core provided by the invention is improved; when the magnetic field strength is 0.2(Oe), the magnetic conductivity of the iron-silicon-ferrite composite magnetic core can reach 10,000, which is far higher than the initial magnetic conductivity of an iron-silicon magnetic core 57 under the same condition and is 169 times of the magnetic conductivity of the iron-silicon 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 an iron-silicon-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 ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F3/10H01F1/147H01F41/02
CPCH01F1/14766H01F3/10H01F41/0246H01F2003/106
Inventor 毛圣华张勉团皮金斌
Owner JIANGXI AITE MAGNETS
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