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FeSi magnetic powder core and manufacturing method thereof

A technology of iron-silicon powder and magnetic powder core is applied in the field of iron-silicon magnetic powder core and its preparation, which can solve the problems of ineffective isolation of powder particles and particles and high loss, and achieves improved DC superposition characteristics, low production cost, and reduced magnetic loss. Effect

Active Publication Date: 2014-05-28
武汉中磁浩源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since iron-silicon alloy powder will react with phosphoric acid to generate red iron oxide in the process of using phosphoric acid as passivating agent, this red substance is a semiconductor, so that the powder particles cannot be effectively isolated from each other, making the Its loss is high

Method used

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  • FeSi magnetic powder core and manufacturing method thereof
  • FeSi magnetic powder core and manufacturing method thereof
  • FeSi magnetic powder core and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The influence of embodiment 1Si, Ni or Co on the soft magnetic properties of iron-silicon powder

[0028] 1. Mix silicon and iron with different contents, put them in a smelting furnace, and melt them into molten steel at 1500-1800°C, then flow the molten steel into the atomizer at a speed of 10-20 kg per minute, and pass through 40-100MPa The high-speed nitrogen generated by high pressure pulverizes molten steel to make iron-silicon powder.

[0029] from figure 1 It can be seen from the figure that when the silicon content is 5-7%, the magnetostriction coefficient λs and the magnetocrystalline anisotropy constant κ1 of the alloy are lower, and the resistivity ρ is higher, so the loss is lower and the soft magnetic properties are better. excellent.

[0030] 2. Taking the silicon content of 6% as an example, adding different contents of Ni or Co elements to the iron-silicon alloy, it can be seen from the following table 1 that adding a small amount of Ni or Co elements...

Embodiment 2

[0034] In this embodiment, the composition of the iron-silicon powder alloy is: 5% Si, 1.5% Ni, and the rest is Fe. It is prepared by the aerosol method. The specific steps of the aerosol method are: put Si, Ni, and Fe in a melting furnace, melt them into molten steel at 1500-1800°C, and then melt the molten steel at a rate of 10-100°C per minute. The speed of 20 kg flows into the atomizer, and the high-speed nitrogen gas generated by the high pressure of 40-100 MPa pulverizes the molten steel to obtain iron-silicon powder. The particle size distribution of the iron-silicon powder is as follows: 150 mesh ≤ particle size < 200 mesh accounts for 10%; 200 mesh ≤ particle size < 325 mesh accounts for 60%; particle size ≥ 325 mesh accounts for 30%.

[0035] The preparation method of iron-silicon magnetic powder core is:

[0036] 1) Take ferrosilicon powder, add 1% potassium permanganate as a passivation agent, then heat water to dilute and mix well, and fry to dry;

[0037] 2) Ad...

Embodiment 3

[0052] In this embodiment, the composition of the iron-silicon powder alloy is: 7% Si, 0.1% Co, and the rest is Fe. It is prepared by the aerosol method. The specific steps of the aerosol method are: put Si, Co, and Fe in a melting furnace, melt them into molten steel at 1500-1800°C, and then melt the molten steel at a rate of 10-100°C per minute. The speed of 20 kg flows into the atomizer, and the high-speed nitrogen gas generated by the high pressure of 40-100 MPa pulverizes the molten steel to obtain iron-silicon powder. The particle size distribution of the iron-silicon powder is as follows: 150 mesh ≤ particle size < 200 mesh accounts for 20%; 200 mesh ≤ particle size < 325 mesh accounts for 50%; particle size ≥ 325 mesh accounts for 30%.

[0053]The preparation method of iron-silicon magnetic powder core is:

[0054] 1) Take iron-silicon powder, add 0.01% magnesium permanganate as a passivation agent, then heat water to dilute and mix well, and fry to dry;

[0055] 2) ...

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Abstract

The invention discloses a manufacturing method of a FeSi magnetic powder core. The manufacturing method includes adding trace elements Ni or Co on the basis of FeSi and preparing FeSi powder by means of aerosol, wherein the composition includes 5-7% of Si, 0.1-1.5% of Ni or Co, and the balance of Fe. The manufacturing method adopts permanganate as passivator, epoxy resin and phenolic resin mixture as binder, and the Fesi magnetic powder core manufactured has the advantages of excellent direct-current bias characteristics, low magnetic loss, high density, smoothness, good formability and the like.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and in particular relates to a ferrosilicon magnetic powder core and a preparation method thereof. Background technique [0002] With the continuous advancement of science and technology, electronic products are developing towards the requirements of high precision, high sensitivity, large capacity and miniaturization, and higher requirements are also put forward for metal magnetic powder cores used in various electronic products. FeSi magnetic powder core is prepared by powder metallurgy process, its resistivity is much higher than alloy soft magnetic materials such as silicon steel, so its eddy current loss is small, and it can work at higher frequency; at the same time, its excellent DC superposition characteristics and low The loss just fills the gap of iron powder core and other alloy magnetic powder core. [0003] At present, there are mainly three methods for the preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/20B22F1/00B22F3/16
Inventor 陈艳
Owner 武汉中磁浩源科技有限公司
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