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Preparation method of gas atomization Fe-Si-Al magnetic powder core with ultralow magnetic conductivity

A technology of sendust and gas atomization, which is applied in the manufacture of inductors/transformers/magnets, the improvement of process efficiency, and magnetic objects. It can solve the problems of high surface hardness and shedding of sendust powder, and improve the molding formability , Improve the mechanical strength, improve the effect of electromagnetic properties

Active Publication Date: 2022-07-08
天通(六安)新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After retrieval, the Chinese patent application number is CN201811079978.6, which discloses a process for preparing sendust powder and making magnetic cores by using non-vacuum air atomization, including the following steps: 1. Take the main materials of pure iron and ferrosilicon , aluminum pellets, auxiliary materials are slag remover, carbon powder; 2. Put the pure iron into the intermediate frequency furnace and heat it. After the pure iron is about to melt, put it into ferrosilicon. Solution Because only phosphoric acid is used to passivate the sendust powder, there is also an oxide layer formed on the surface of the sendust powder by phosphoric acid. The problem of falling off the powder surface

Method used

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  • Preparation method of gas atomization Fe-Si-Al magnetic powder core with ultralow magnetic conductivity
  • Preparation method of gas atomization Fe-Si-Al magnetic powder core with ultralow magnetic conductivity
  • Preparation method of gas atomization Fe-Si-Al magnetic powder core with ultralow magnetic conductivity

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Embodiment 1

[0038] A preparation method of ultra-low permeability gas atomized iron-silicon-aluminum magnetic powder core, such as Figure 1-3 As shown, it includes three steps of gas atomization pulverization, passivation treatment and magnetic powder core preparation, and the gas atomization pulverization includes the following steps:

[0039] S1: Pour pure iron blocks, ferrosilicon blocks and aluminum granules into a vacuum high-frequency induction furnace for smelting, in which ferrosilicon blocks account for 10-11.5%, aluminum granules account for 5.5-6.5%, and the balance is pure iron blocks ;

[0040] S2: Then add lead or chromium blocks into the vacuum high-frequency induction furnace, and the lead or chromium blocks account for 0.5-1.5% of the total weight of pure iron blocks, ferrosilicon blocks and aluminum particles;

[0041] S3: then pass high-pressure gas into the tundish of the atomization equipment, and perform atomization and powder production under the pressure of the h...

Embodiment 2

[0061] A preparation method of an ultra-low permeability gas atomized iron-silicon-aluminum magnetic powder core, in order to find a mixed acid solution that can most effectively passivate the iron-silicon-aluminum powder, in the SA1, the mixed acid solution is composed of chromic acid , phosphoric acid, boric acid, hydrochloric acid and water, the ratio of phosphoric acid to FeSiAl powder is 10-12%, the ratio of boric acid to FeSiAl powder is 2-3%, and the ratio of water to FeSiAl powder is 10-15% , the ratio of chromic acid and Fe-Si-Al powder is 3-5%.

[0062] Then, according to the three steps of gas atomization powder milling, passivation treatment and magnetic powder core preparation, the iron-silicon-aluminum magnetic powder core is made, and the magnetic powder made of iron-silicon-aluminum powder after passivation using the mixed acid solution is analyzed by impedance analyzer. The magnetic permeability of the core is measured, and the value of the magnetic core loss ...

Embodiment 3

[0064] A method for preparing an ultra-low magnetic permeability gas atomized iron-silicon-aluminum magnetic powder core. In the SA1, the mixed acid solution is formed by mixing chromic acid, phosphoric acid, boric acid, hydrochloric acid and water, and the ratio of phosphoric acid to iron-silicon-aluminum powder is: 10-12%, the ratio of boric acid to Fe-Si-Al powder is 2-3%, the ratio of water to Fe-Si-Al powder is 10-15%, and the ratio of chromic acid to Fe-Si-Al powder is 1-2%.

[0065] Then, according to the three steps of gas atomization powder milling, passivation treatment and magnetic powder core preparation, the iron-silicon-aluminum magnetic powder core is made, and the magnetic powder made of iron-silicon-aluminum powder after passivation using the mixed acid solution is analyzed by impedance analyzer. The magnetic permeability of the core is measured, and the value of the magnetic core loss (Pcv) of the magnetic powder core is obtained by calculation, and the DC sup...

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Abstract

The invention discloses a preparation method of an ultra-low magnetic conductivity atomized Fe-Si-Al magnetic powder core, and relates to the technical field of metal soft magnetic materials. The problem that an oxide layer on the surface of the Fe-Si-Al powder is prone to falling off from the surface of the Fe-Si-Al powder in the subsequent processing link is solved. The method specifically comprises three steps of gas atomization powder preparation, passivation treatment and magnetic powder core preparation, and the gas atomization powder preparation comprises the following steps that pure iron blocks, silicon iron blocks and aluminum particles are poured into a vacuum high-frequency induction furnace to be smelted, and the silicon iron blocks account for 10-11.5%; a proper amount of chromic acid is added into the mixed acid liquor formed by mixing phosphoric acid, boric acid, hydrochloric acid and water, the passivation effect of the mixed acid liquor on the surface of the Fe-Si-Al powder can be effectively improved, meanwhile, lead or chromium contained in the Fe-Si-Al powder is matched, the covering uniformity of an oxidation film on the surface of the Fe-Si-Al powder can be improved, and the service life of the Fe-Si-Al powder is prolonged. And an oxidation film on the surface of the Fe-Si-Al powder is prevented from easily falling off in subsequent processing.

Description

technical field [0001] The invention relates to the technical field of metal soft magnetic materials, in particular to a preparation method of an ultra-low magnetic permeability gas atomized iron-silicon-aluminum magnetic powder core. Background technique [0002] Metal magnetic powder core refers to a soft magnetic composite material obtained by mixing metal soft magnetic powder with insulating binder, molding and heat treatment. Metal magnetic powder core is widely used in switching power converters, filters, AC / DC converters, In terms of DC / DC converters, etc., it is an indispensable key component in electronic equipment. At present, iron-silicon-aluminum magnetic powder cores on the market usually have five specifications of magnetic permeability of 26, 60, 75, 90, and 125. Aluminum magnetic powder core is mainly composed of FeSiAl powder and insulating material. According to the difference of FeSiAl powder, it can be divided into ordinary FeSiAl magnetic powder core and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147
CPCH01F41/0246H01F1/14791Y02P10/20
Inventor 涂勇威张世宇武进
Owner 天通(六安)新材料有限公司
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