A kind of preparation method of iron-silicon soft magnetic alloy powder

A soft magnetic alloy and iron-silicon technology, which is applied in the field of metal powder preparation, can solve the problems that the three kinds of iron-silicon alloy powders are difficult to realize, and achieve the effects of easy crushing and powder making, simplified preparation and production process, and low energy consumption

Active Publication Date: 2018-10-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the preparation methods of the three iron-silicon alloy powders in the prior art are difficult to achieve the above requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. The composition (percentage by weight) of the iron-silicon soft magnetic alloy in Example 1 of the present invention is: Si5.1%, Cr4.0%, P0.05%, and the balance is Fe.

[0021] 2. Using a 45kg vacuum induction melting furnace for smelting, put industrial pure iron, chromium, crystalline silicon, and ferrophosphorus into the crucible according to the smelting sequence, melt and refine under vacuum; the alloy melt is poured into a water-cooled furnace with a speed of 7 m / s Rapid cooling and solidification on the roll into alloy flakes with a thickness of 0.4-0.7 mm;

[0022] 3. The alloy flakes are crushed by a jaw crusher to particles less than 3 mm, soaked in liquid nitrogen for 15 minutes; put into the ring hammer mill for powder; when the ring hammer mill is powdered, it is dry-ground with argon protective atmosphere, and the fine particles are screened out. granular powder;

[0023] 4. Use a low-speed stirring mill to grind and shape the fine particle powder morp...

Embodiment 2

[0027] 1. The composition (percentage by weight) of the iron-silicon soft magnetic alloy in Example 2 of the present invention is: Si6.1%, Cr2.0%, P0.15%, and the balance is Fe.

[0028] 2. Using a 45kg vacuum induction melting furnace for smelting, put industrial pure iron, chromium, crystalline silicon, and ferrophosphorus into the crucible according to the smelting sequence, melt and refine under vacuum; the alloy melt is poured into a water-cooled furnace with a speed of 5.5 m / s Rapid cooling and solidification on the roll into alloy flakes with a thickness of 0.4-0.7 mm;

[0029] 3. The alloy flakes are crushed by a jaw crusher to particles less than 3 mm, soaked in liquid nitrogen for 10 minutes; put into the ring hammer mill for powder; when the ring hammer mill is powdered, it is dry-ground with argon protective atmosphere, and the fine particles are screened out. granular powder;

[0030] 4. Use a low-speed stirring mill to grind and shape the fine particle powder mo...

Embodiment 3

[0034] 1. The iron-silicon soft magnetic alloy composition (percentage by weight) of Example 3 of the present invention is: Si5.5%, Cr3.0%, P0.11%, and the balance is Fe.

[0035] 2. Using a 45kg vacuum induction melting furnace for smelting, put industrial pure iron, chromium, crystalline silicon, and ferrophosphorus into the crucible according to the smelting sequence, melt and refine under vacuum; the alloy melt is poured into a water-cooled furnace with a speed of 6.3 m / s Rapid cooling and solidification on the roll into alloy flakes with a thickness of 0.4-0.7 mm;

[0036] 3. The alloy flakes are crushed by a jaw crusher to particles less than 3 mm, soaked in liquid nitrogen for 10 minutes; put into the ring hammer mill for powder; when the ring hammer mill is powdered, use nitrogen protection atmosphere dry grinding to screen out fine particles powder;

[0037] 4. Use a low-speed stirring mill to grind and shape the fine particle powder morphology with nitrogen protecti...

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Abstract

The invention provides a preparation method of iron-silicon soft magnetic alloy powder. The preparation method comprises the following steps: (1) preparing alloy through the following raw materials in percentage by weight: 5.0 to 6.2% of Si, 2.0 to 4.0% of Cr, 0.05 to 0.15% of P, and the balance Fe; (2) feeding the raw materials into a crucible, smelting through a vacuum induction furnace, and cooling molten alloy into thin sheets in a rapid solidification manner; (3) crushing the thin sheets; dipping with liquid nitrogen; grinding through a ring hammer; and sieving to obtain fine alloy particle powder; (4) grinding through a low-speed stirring grinding machine, and shaping the powder; (5) thermally processing the powder under a reduction atmosphere, namely, heating to reach the temperature of 780 to 900 DEG C, and maintaining the temperature for 2 to 5 hours; and (6) sieving to obtain fine particular iron-silicon soft magnetic alloy powder meeting the requirement of a user on particle size. With the adoption of the method, the fine iron-silicon soft magnetic alloy powder which has a good appearance and is shaped like spheres can be prepared; the demand of preparing an integrally-formed inductor can be met.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation, in particular to a method for preparing iron-silicon soft magnetic alloy powder, which is especially suitable for preparing soft magnetic alloy powder for integrated inductors. Background technique [0002] Ferrosilicon alloy powder is a kind of soft magnetic material with excellent performance. It has the advantages of good magnetic properties, rich raw material resources and low price. It is widely used in fields and can be applied to inverter power supply, electric power active power factor compensation circuit, Solar photovoltaic system power filtering, etc., including the preparation of integrated inductors. [0003] At present, there are three main production methods of iron-silicon alloy powder: 1) gas atomization method; 2) water atomization method; 3) mechanical crushing method. The iron-silicon alloy powder produced by the gas atomization method is a spherical powder w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/041
Inventor 刘志坚陈远星何坤宏吴水桂
Owner SOUTH CHINA AGRI UNIV
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