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Preparation method of iron-silicon soft magnetic alloy powder

A technology of soft magnetic alloy and iron-silicon, which is applied in the preparation of iron-silicon soft magnetic alloy powder, and in the field of soft magnetic alloy powder for the preparation of integrated inductors, can solve the problems that three kinds of iron-silicon alloy powder are difficult to realize, and achieve Simplified production process, uniform composition and high powder quality

Active Publication Date: 2017-03-15
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 (weight percentage) of the iron-silicon alloy in Example 1 of the present invention is: Si5.1%, Cr4.0%, P0.05%, and the balance is Fe.

[0021] 2. Use a 45kg vacuum induction melting furnace to smelt, put industrial pure iron, chromium, crystalline silicon, and ferrophosphorus into the crucible according to the smelting sequence, and melt and refine under vacuum; the alloy melt is poured to water cooling with a speed of 7 m / s The roller is rapidly cooled and solidified 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 machine powder; when the ring hammer mills, use the argon atmosphere to dry ground, and screen out fine particles powder;

[0023] 4. Use a low-speed stirring mill to grind and shape the fine powder morphology with a nitrogen atmosphere;

[0024] 5. Heat the fine powder to 900 in a pure h...

Embodiment 2

[0027] 1. The composition (weight percentage) of the iron-silicon 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 to smelt, put industrial pure iron, chromium, crystalline silicon, and ferrophosphorus into the crucible according to the smelting sequence, and melt and refine under vacuum; the alloy melt is poured into water cooling with a speed of 5.5 m / s The roller is rapidly cooled and solidified 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 machine powder; when the ring hammer mills, use the argon atmosphere to dry ground, and sieving out fine particles powder;

[0030] 4. Use a low-speed stirring mill to grind and shape the fine powder morphology with a nitrogen atmosphere;

[0031] 5. Heat the fine powder to 780 in a ...

Embodiment 3

[0034] 1. The composition (weight percentage) of the iron-silicon alloy in 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 to smelt, put industrial pure iron, chromium, crystalline silicon, ferrophosphorus, and iron sulfide into the crucible according to the smelting sequence, and melt and refine under vacuum; the alloy melt is poured to a rotation speed of 6.3 meters / Sec on the water-cooled roller, it is rapidly cooled and solidified 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 machine powder; when the ring hammer mills, use the nitrogen atmosphere to dry grinding, and sieving out fine particles. ;

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

[0038] 5. Hea...

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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 particularly suitable for preparing soft magnetic alloy powder for integrated inductors. Background technique [0002] Iron-silicon alloy powder is a kind of soft magnetic material with excellent performance. It has the advantages of good magnetic performance, abundant raw material resources and low price. It has a wide range of applications and can be applied to inverter power supplies, power active power factor compensation circuits, 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 spherical powder w...

Claims

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Application Information

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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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