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Preparation method of iron-silicon-aluminum alloy powder with high magnetic conductivity

A technology for the preparation of sendust and powder, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc. It can solve the problems of serious component segregation, easy growth of grains, and high energy consumption of multi-stage crushing. Achieve the effect of simple production process, improve purity and reduce oxygen content

Inactive Publication Date: 2019-12-03
山东汇嘉磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sendust powder prepared by ordinary ingot has many problems, such as the crystal grains are easy to grow when solidified, forming coarse columnar crystals, serious component segregation, and high energy consumption for multi-stage crushing.

Method used

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  • Preparation method of iron-silicon-aluminum alloy powder with high magnetic conductivity
  • Preparation method of iron-silicon-aluminum alloy powder with high magnetic conductivity
  • Preparation method of iron-silicon-aluminum alloy powder with high magnetic conductivity

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preparation example Construction

[0029] The present invention provides a kind of high magnetic permeability sendust aluminum alloy powder preparation method, such as figure 1 shown, including the following steps:

[0030] S1. Melting: Melt pure iron, silicon, and aluminum gradually in an intermediate frequency induction furnace, and keep them warm for 30-50 minutes under the action of alkaline reducing mold slag to fully alloy the molten steel. The pouring temperature is controlled at 1550°C to 1650°C;

[0031] S2. Quenching pouring: The entire copper roller is processed in a closed container, filled with nitrogen protection, and the molten steel is poured on the surface of the water-cooled copper roller with a rotation speed of 40-50r / min at a flow rate of 20Kg-40Kg / min. Cooling, and the solidification cooling rate of the molten steel is as high as 500°C / s. Under the action of centrifugal force, it is thrown into thin strips. The inside of the copper roller adopts a circulating waterway, and the water inlet ...

Embodiment 1

[0038] Use medium frequency induction melting furnace to smelt FeSiAl powder, the composition is: Si: 9.6%, Al: 5.4%, the balance is Fe; add iron, silicon, aluminum alloy to the induction furnace in turn, and stir evenly after all the metals are melted; Add composite mold slag, keep it warm for 30 minutes, increase the power of the intermediate frequency induction furnace, and pour molten steel when the temperature of the molten steel reaches 1550°C;

[0039] The molten steel is poured onto the surface of the rotating water-cooled copper roller. The pouring speed of the molten steel is 25Kg / min, and the rotation speed of the water-cooled copper roller is 40r / min. Under the action of rapid cooling and the centrifugal force of the copper roller, the molten steel is quickly made into a thin strip ;

[0040] The sendust aluminum strip is crushed by a pulverizer and processed into powder particles of about 5mm; the crushed metal particles are added to a horizontal ball mill for fur...

Embodiment 2

[0046] Use medium frequency induction melting furnace to smelt FeSiAl powder, the composition is: Si: 9.6%, Al: 5.4%, the balance is Fe; add iron, silicon, aluminum alloy to the induction furnace in turn, and stir evenly after all the metals are melted; Add composite mold slag, keep it warm for 40 minutes, increase the power of the intermediate frequency induction furnace, and pour molten steel when the temperature of the molten steel reaches 1600°C;

[0047] The molten steel is poured onto the surface of the rotating water-cooled copper roller. The pouring speed of the molten steel is 35Kg / min, and the rotation speed of the water-cooled copper roller is 45r / min. Under the action of rapid cooling and the centrifugal force of the copper roller, the molten steel is quickly made into a thin strip ;

[0048] The sendust aluminum strip is crushed by a pulverizer and processed into powder particles of about 5mm; the crushed metal particles are added to a horizontal ball mill for fur...

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Abstract

The invention provides a preparation method of iron-silicon-aluminum alloy powder with high magnetic conductivity, relates to the soft magnetic material field and a rapid cooling pouring technology, and is an improvement of an iron-silicon-aluminum soft magnetic powder manufacturing process. The preparation method of the iron-silicon-aluminum alloy powder with high magnetic conductivity comprisesthe following steps of smelting, quenching and pouring, mechanical crushing, screening, annealing, mixing and sample preparation testing. In a quenching and pouring process, molten steel is poured toa surface of a rotated water-cooled copper roller according to a preset flow, and the molten steel is rapidly cooled when encountering the copper roller and is swung into a thin band under a centrifugal force effect. According to the preparation method, complex equipment is not needed, purity of the smelted molten steel is greatly improved, an oxygen content of the powder is low, a grain size is fine, the magnetic conductivity of a prepared magnetic powder core can reach more than 150 mu, and losses are low.

Description

technical field [0001] The invention relates to the field of soft magnetic materials and rapid cooling casting technology, in particular to a preparation method of high-permeability iron-silicon-aluminum alloy powder. Background technique [0002] With the trend of high frequency, miniaturization, thin film and high power of electronic components, higher requirements are put forward for the performance index of soft magnetic materials. In soft magnetic materials, FeSiAl magnetic powder core has the advantages of good high-frequency characteristics, low loss, low cost, and high saturation magnetic induction. It is widely used in inductors, phase shift compensation inductors, and pulse transformers. [0003] As the market has higher and higher performance requirements for sendust magnetic powder cores, it is urgent to improve the magnetic properties of sendust magnetic powder cores. There are many problems in the sendust powder prepared by ordinary ingot casting, such as the...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F41/02
CPCH01F1/14791H01F41/0246
Inventor 司超新张仁军赵加爱赵松松孟扬
Owner 山东汇嘉磁电科技有限公司
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