High-frequency high-Q-value FeSiAl@MnZn ferrite soft magnetic composite magnetic powder core and preparation method thereof

A soft magnetic composite, ferrite technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc. problems, to achieve the effect of improving quality factor and permeability, stable strength, and improving quality factor

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

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Problems solved by technology

However, its high-frequency magnetic properties are poor, the quality factor and permeability decrease sharply at high frequencies, and the loss increases sharply, which seriously limits its application at high frequencies.

Method used

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  • High-frequency high-Q-value FeSiAl@MnZn ferrite soft magnetic composite magnetic powder core and preparation method thereof
  • High-frequency high-Q-value FeSiAl@MnZn ferrite soft magnetic composite magnetic powder core and preparation method thereof

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preparation example Construction

[0031] The preparation method of FeSiAl@MnZn ferrite composite magnetic powder core with high magnetic permeability and high Q value under high frequency of the present invention, the steps include:

[0032] S1. Selection of powder: Take mechanically crushed FeSiAl powder, its composition is Si: 8%-13%, Al: 4%-7%, and the rest is Fe. Pass the crushed FeSiAl powder through a 200-mesh sieve, and take the under-sieved powder.

[0033] S2. Preparation of coating agent solution: according to the three metal elements Fe in MnZn ferrite 2+ : Zn 2+ :Mn 2+ The molar ratio of 2:x:(1-x), where x is 0~1, x≠0 and x≠1, respectively weigh iron salt, zinc salt and manganese salt, dissolve them in deionized water, and stir After dissolving completely, obtain Fe-Mn-Zn mixed salt solution;

[0034]S3. Coating process: Pour the FeSiAl powder obtained in step S1 into deionized water with the same quality as the sendust powder to make a suspension, heat it to 50-80°C, and then add the Fe-SiAl p...

Embodiment 1

[0040] 1. Take mechanically crushed FeSiAl powder, its composition is Si: 9%, Al: 6%, and Fe is the balance according to the weight ratio. Pass the FeSiAl powder through a 200-mesh sieve, and take the undersize.

[0041] 2. Coat the surface of FeSiAl powder with MnZn ferrite insulating layer by chemical co-precipitation method, the co-precipitation temperature is 70°C, and the reaction time is 30 minutes.

[0042] 3. With anhydrous FeCl 2 , ZnCl 2 4H 2 O and anhydrous MnCl 2 As a reactant, according to Fe 2+ : Zn 2+ :Mn 2+ The molar ratio is 2:0.9:0.1, respectively weigh chloride salt, dissolve in deionized water, get FeCl 2 -ZnCl 2 -MnCl 2 Mix the salt solution.

[0043] 4. According to the mass ratio of MnZn ferrite:FeSiAl being 0.5:99.5, weigh the mechanically crushed FeSiAl powder, pour it into deionized water, and heat it to 70°C. Slowly drop the corresponding amount of FeCl into the heated FeSiAl magnetic powder 2 -ZnCl 2 -MnCl 2 Mix the salt solution, stir...

Embodiment 2

[0048] 1. Take mechanically crushed FeSiAl powder, its composition is Si: 9%, Al: 6%, and Fe is the balance according to the weight ratio. Pass the FeSiAl powder through a 200-mesh sieve, and take the undersize.

[0049] 2. Coat the surface of the crushed FeSiAl powder with a MnZn ferrite insulating layer by chemical co-precipitation method, the co-precipitation temperature is 70°C, and the reaction time is 30 minutes.

[0050] 3. With anhydrous FeCl 2 , ZnCl 2 4H 2 O and anhydrous MnCl 2 As a reactant, by Fe 2+ : Zn 2+ :Mn 2+ The molar ratio is 2:0.5:0.5 Weigh chloride salt respectively, dissolve in deionized water, get FeCl 2 -ZnCl 2 -MnCl 2 Mix the salt solution.

[0051] 4. According to the mass ratio of MnZn ferrite:FeSiAl being 3:97, weigh the crushed FeSiAl powder, pour it into deionized water equivalent to the mass of FeSiAl powder, and heat to 70°C. Slowly drop the corresponding amount of FeCl into the heated FeSiAl magnetic powder 2 -ZnCl 2 -MnCl 2 Mix ...

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Abstract

The invention discloses a high-frequency high-Q-value FeSiAl@MnZn ferrite soft magnetic composite magnetic powder core and a preparation method thereof. The preparation method mainly comprises the steps of powder size screening, MnZn ferrite shell layer coating through a chemical coprecipitation method, composite magnetic powder pre-sintering, compression molding, annealing and the like. According to the method, flattening and phosphating treatment is not carried out on FeSiAl powder, the experimental process is simplified, environmental pollution is reduced, a better coating effect can be achieved, electric contact among metal magnetic powder particles is effectively isolated, the magnetic conductivity and the quality factor of the composite magnetic powder core are improved, and the application frequency range of the FeSiAl magnetic powder core is widened. The method is simple in implementation process, short in reaction time and easy for large-scale production and industrial application.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and device preparation. More specifically, the invention relates to a high-frequency high-Q value FeSiAl@MnZn ferrite soft magnetic composite magnetic powder core and a preparation method thereof. Background technique [0002] The magnetic powder core is a kind of soft magnetic material made by mixing and pressing magnetic material powder and insulating medium. Compared with other alloy materials, FeSiAl has the characteristics of high saturation magnetic flux density, good temperature stability, and high saturation magnetization, so it can be used for higher power. These characteristics make magnetic powder cores have advantages that other magnetic materials cannot match in many applications. At present, they have been widely used in energy storage filter inductors, power transformer cores, choke coils and switching power supplies. [0003] With the rapid development of electronic inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/02H01F1/147H01F1/24H01F1/37
CPCH01F1/33H01F41/0246H01F1/14791H01F1/24H01F1/344H01F1/37
Inventor 刘明董璇
Owner 西安锐磁电子科技有限公司
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