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Low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity and preparation method of low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity

A soft magnetic composite, ferrite technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of high loss, limited application in high frequency fields, easy to generate heat, etc., to reduce power loss, The effect of avoiding the decrease of saturation magnetization and permeability and increasing the resistivity of powder

Pending Publication Date: 2021-11-16
西安锐磁电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sendust magnetic powder core has high loss and heat generation at high frequencies, which limits its application in the high frequency field.

Method used

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  • Low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity and preparation method of low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity
  • Low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity and preparation method of low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity
  • Low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity and preparation method of low-loss FeSiAl/MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity

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Effect test

preparation example Construction

[0028] Concretely, the preparation method of the FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic permeability and low loss of the present invention, the steps include:

[0029] S1. Powder screening: Take crushed FeSiAl powder, its composition and the mass percentage of each component are: Si: 8%-13%, Al: 4%-7%, and the rest is Fe. Passing the crushed FeSiAl powder through a sieve to obtain FeSiAl powder with a particle size not greater than 75 microns;

[0030] S2. Powder annealing: put FeSiAl magnetic powder into the atmosphere furnace, introduce reducing gas, control the temperature at 600-800°C, and heat-treat for 0.5-5h; the reducing gas is one or both of hydrogen and hydrogen-argon mixed gas. a mixture of species;

[0031] S3. Phosphoric acid phosphating: add the annealed FeSiAl magnetic powder into the phosphoric acid solution for phosphating and drying to obtain phosphating FeSiAl magnetic powder; wherein, in the phosphoric acid so...

Embodiment 1

[0040] The preparation method of the stable magnetic permeability and low loss FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core in this embodiment includes the following steps:

[0041] 1. Take crushed FeSiAl powder, the composition of which is Si: 8%, Al: 7%, and the rest is Fe. Pass the crushed powder through a sieve, and select the powder under a 200 mesh sieve (<75 microns);

[0042] 2. Put the FeSiAl magnetic powder into the atmosphere furnace, pass in hydrogen, control the temperature at 600°C, and anneal for 5 hours;

[0043] 3. Adding the annealed FeSiAl magnetic powder to an acetone phosphate solution with a solute mass percentage of 0.1wt.% for phosphating and drying to obtain phosphating FeSiAl magnetic powder;

[0044] 4. Mix the phosphating FeSiAl magnetic powder and MnZn ferrite powder, in which the magnetic permeability of MnZn ferrite is 1400, and the addition amount is 6% of the mass of the FeSiAl magnetic powder. Use a high-energy ball mill f...

Embodiment 2

[0053] The preparation method of the stable magnetic permeability and low loss FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core in this embodiment includes the following steps:

[0054] 1. Take crushed FeSiAl powder, the composition of which is Si: 13%, Al: 4%, and the rest is Fe. Pass the crushed powder through a sieve, and select the powder under a 200 mesh sieve (<75 microns);

[0055] 2. Put the FeSiAl magnetic powder into the atmosphere furnace, pass in the mixed gas of hydrogen and argon, control the temperature at 800°C, and anneal for 0.5h;

[0056] 3. Adding the annealed FeSiAl magnetic powder to an aqueous phosphoric acid solution with a solute mass percentage of 1.5wt.% for phosphating and drying to obtain phosphating FeSiAl magnetic powder;

[0057] 4. Mix the phosphating FeSiAl magnetic powder with MnZn ferrite powder, wherein the MnZn ferrite has a magnetic permeability of 2000, and the amount added is 6% of the mass of the FeSiAl magnetic powder...

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Abstract

The invention discloses a low-loss FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity and a preparation method of the low-loss FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic conductivity. The raw materials of the magnetic powder core comprise an adhesive, a lubricant and FeSiAl / MnZn ferrite composite magnetic powder; the FeSiAl / MnZn ferrite composite magnetic powder comprises phosphatized FeSiAl magnetic powder and a MnZn ferrite layer, and the surface of the phosphatized FeSiAl magnetic powder is coated with the MnZn ferrite layer through ball milling. According to the preparation method, a phosphoric acid / MnZn ferrite composite coating process is mainly adopted, and MnZn ferrite coating is carried out on the phosphorized FeSiAl powder through the high-energy ball milling method. The preparation method has the advantages of convenience in material preparation, simple operation, uniform coating and good coating effect, and can better facilitate industrial popularization; the MnZn ferrite with ferrimagnetism serves as an insulating coating agent, so that the magnetic dilution phenomenon caused by a non-magnetic substance serving as the coating agent is reduced. The high-frequency performance of the FeSiAl magnetic powder core can be improved, and the provided FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core is low in loss and stable in magnetic conductivity under high frequency.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and device preparation, and in particular relates to a FeSiAl / MnZn ferrite soft magnetic composite magnetic powder core with stable magnetic permeability and low loss and a preparation method thereof. Background technique [0002] Metal magnetic powder core is a soft magnetic composite material made of metal soft magnetic powder as raw material, which is made of insulating coating, compression molding and heat treatment. Metal magnetic powder core has higher saturation magnetic flux density than soft ferrite core, and lower medium and high frequency loss than silicon steel lamination, so it shows excellent performance in suitable application frequency band, high operating current and large power. Excellent soft magnetic properties, energy storage capacity and good cost performance. The performance of the metal magnetic powder core mainly depends on the magnetic permeability of the powd...

Claims

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Application Information

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IPC IPC(8): H01F1/33H01F41/02H01F1/147H01F1/24H01F1/37
CPCH01F1/33H01F41/0246H01F1/14791H01F1/24H01F1/344H01F1/37
Inventor 刘明靳勐
Owner 西安锐磁电子科技有限公司
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