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Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing

A technology of sendust and magnetic powder core, which is applied in the field of powder metallurgy manufacturing of metal materials, to achieve significant economic effects, low loss, and reduced pressing pressure

Active Publication Date: 2016-02-24
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of FeSiAl soft magnetic powder core by warm pressing

Method used

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  • Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing
  • Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing
  • Method for preparing iron-silicon-aluminum soft magnetic powder core through warm-pressing

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Embodiment 1

[0031] An embodiment of the method for preparing sendust soft magnetic powder core by warm pressing in the present invention, the preparation method of the soft magnetic powder core described in this embodiment comprises the following steps:

[0032] (1) Passivate the initial soft magnetic alloy powder with a phosphoric acid solution with a mass percent concentration of 0.4%, and dry it; the mass ratio of the phosphoric acid solution to the initial soft magnetic alloy powder is 0.5:1;

[0033] (2) The soft magnetic alloy powder after step (1) is dried is mixed evenly with binding agent, and the mass ratio of described binding agent and initial soft magnetic alloy powder is 2%, and described binding agent is sodium silicate, A mixture of high temperature resistant silicone resin, and the mass ratio of the sodium silicate and high temperature resistant silicone resin is 2:1;

[0034] (3) Dry and sieve the mixed powder obtained in step (2), then add nano silicon dioxide to mix an...

Embodiment 2

[0038] An embodiment of the method for preparing sendust soft magnetic powder core by warm pressing in the present invention, the preparation method of the soft magnetic powder core described in this embodiment comprises the following steps:

[0039] (1) Passivate the initial soft magnetic alloy powder with a phosphoric acid solution with a mass percent concentration of 1%, and dry it; the mass ratio of the phosphoric acid solution to the initial soft magnetic alloy powder is 0.6:1;

[0040] (2) The soft magnetic alloy powder after step (1) is dried is mixed evenly with binding agent, and the mass ratio of described binding agent and initial soft magnetic alloy powder is 1.8%, and described binding agent is sodium silicate, A mixture of high temperature resistant silicone resin, and the mass ratio of the sodium silicate and high temperature resistant silicone resin is 3:2;

[0041] (3) Dry and sieve the mixed powder obtained in step (2), then add nano silicon dioxide to mix an...

Embodiment 3

[0045] An embodiment of the method for preparing sendust soft magnetic powder core by warm pressing in the present invention, the preparation method of the soft magnetic powder core described in this embodiment comprises the following steps:

[0046] (1) Passivate the initial soft magnetic alloy powder with a phosphoric acid solution with a mass percent concentration of 2%, and dry it; the mass ratio of the phosphoric acid solution to the initial soft magnetic alloy powder is 0.8:1;

[0047] (2) The soft magnetic alloy powder after step (1) is dried is mixed evenly with binder, and the mass ratio of described binder and initial soft magnetic alloy powder is 1.6%, and described binder is sodium silicate, A mixture of high temperature resistant silicone resin, and the mass ratio of the sodium silicate and high temperature resistant silicone resin is 3:2;

[0048] (3) Dry and sieve the mixed powder obtained in step (2), then add nano silicon dioxide to mix and coat, the mass rati...

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Abstract

The invention discloses a method for preparing an iron-silicon-aluminum soft magnetic powder core through warm-pressing. The method comprises the following steps that (1) initial soft magnetic alloy powder is subjected to passivating treatment through a passivator, and drying is conducted; (2) the dried soft magnetic alloy powder is evenly mixed with a binder; (3) the mixed powder is dried and sieved, and then an insulator is added for mixing coating; (4) the coated soft magnetic alloy powder is mixed with lubricant, the mixture is put into a die, then pressurization and heating are conducted simultaneously, and warm-pressing forming is conducted; and (5) the warm-pressing formed magnetic powder core is subjected to annealing treatment. The initial soft magnetic alloy powder comprises, by weight, 8.5%-10.5% of silicon, 4.5%-6.5% of aluminum, and the balance iron. The lubricant in the step (4) is the mixture of zinc stearate and polyethylene glycol. According to the method, the density and the magnetic conductivity of the prepared soft magnetic powder core can be effectively improved, and the magnetic loss is significantly reduced.

Description

technical field [0001] The invention relates to the field of powder metallurgy manufacturing of metal materials, in particular to a method for preparing a sendust soft magnetic powder core and a soft magnetic powder core prepared by the method. Background technique [0002] Magnetic powder core is a new type of soft magnetic functional material with special function of magnetoelectric conversion, which is made by mixing and pressing soft magnetic alloy powder and insulating medium through powder metallurgy process. Because the particle size of the magnetic powder is very small, and the surface of the ferromagnetic powder particles is evenly coated with a layer of insulating dielectric film, which improves the resistivity of the magnetic powder core and hinders the eddy current between the magnetic powder, so the eddy current loss is very low, suitable for relatively High frequency applications (above 20kHz). In addition, the magnetic powder core also has the advantages of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/02B22F3/02H01F1/147H01F1/24
CPCB22F1/0003H01F1/14791H01F1/24B22F2003/023B22F1/145B22F1/16
Inventor 黄钧声王志远
Owner GUANGDONG UNIV OF TECH
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