Fe-Si-Al soft magnetic powder

A technology of magnetic powder and iron-silicon, which is applied in the field of sendust soft magnetic powder and its preparation of magnetic powder cores, can solve the problems of high heat treatment temperature, insufficient performance, and insufficient environmental protection, and achieve short heat treatment time, low power consumption, and high temperature low effect

Active Publication Date: 2015-11-04
江苏启诚磁业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art discloses a low-permeability, low-power-consumption sendust soft magnetic material and its preparation method, but this method requires a high post-heat treatment temperature and a long time, which is not environmentally friendly; in addition, the oxygen content is still partial High, performance is not good enough

Method used

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  • Fe-Si-Al soft magnetic powder
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Examples

Experimental program
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Effect test

Embodiment 1

[0023] A preparation process of iron-silicon magnetic powder core:

[0024] (1) Preparation of magnetic powder core raw materials: smelted in a vacuum induction furnace, the chemical composition is: 9.2% Si, 5.0% Al, 0.03% Ni, 0.05% Cr, 0.06% Mn, the carbon content is controlled at 0.015%, and the rest is Fe. Cast ingots in a vacuum, coarsely crush the alloy ingots, and then enter the ball mill to grind them into powders of different particle sizes, and then perform pure nitrogen protection heat treatment;

[0025] (2) Powder preparation: the particle size distribution and proportioning of the ferrosilicon magnetic powder core are:

[0026]

[0027] Then alloy melting is carried out in an open-type intermediate frequency induction furnace with a magnesia crucible, the melting temperature is 1520°C-1580°C, and the alloy melting time is 50-60 minutes;

[0028] After the alloy is smelted, the strip is made by the high-speed cooling method of the strip machine, and it is mecha...

Embodiment 2

[0041] The preparation technology of a kind of iron-silicon magnetic powder core:

[0042] (1) Preparation of magnetic powder core raw materials: smelted in a vacuum induction furnace, the chemical composition is: 9.6% Si, 5.2% Al, 0.03% Ni, 0.09% Cr, 0.06% Mn, the carbon content is controlled at 0.018%, and the rest is Fe. Cast ingots in a vacuum, coarsely crush the alloy ingots, and then enter the ball mill to grind them into powders of different particle sizes, and then perform pure nitrogen protection heat treatment;

[0043] (2) Powder preparation: the particle size distribution and proportioning of the ferrosilicon magnetic powder core are:

[0044]

[0045] Then alloy melting is carried out in an open-type intermediate frequency induction furnace with a magnesia crucible, the melting temperature is 1580°C, and the alloy melting time is 50-60 minutes;

[0046] After the alloy is smelted, the strip is made by the high-speed cooling method of the strip machine, and it ...

Embodiment 3

[0060] The preparation technology of a kind of iron-silicon magnetic powder core:

[0061] (1) Preparation of magnetic powder core raw materials: smelted in a vacuum induction furnace, the chemical composition is: 9.5% Si, 5.1% Al, 0.03% Ni, 0.06% Cr, 0.06% Mn, the carbon content is controlled at 0.016%, and the rest is Fe. Cast ingots in a vacuum, coarsely crush the alloy ingots, and then enter the ball mill to grind them into powders of different particle sizes, and then perform pure nitrogen protection heat treatment;

[0062] (2) Powder preparation: the particle size distribution and proportioning of the ferrosilicon magnetic powder core are:

[0063]

[0064] Then the alloy melting is carried out in an open-type intermediate frequency induction furnace with a magnesia crucible, the melting temperature is 1550°C, and the alloy melting time is 55 minutes;

[0065] After the alloy is smelted, the strip is made by the high-speed cooling method of the strip machine, and it...

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Abstract

The invention discloses a manufacturing method for Fe-Si magnetic powder. The method includes the steps that the powder is smelted through a vacuum induction furnace and comprises the chemical composition of Si, Al, Ni, Cr, Mn, C and the balance Fe, the content of C is controlled to range from 0.015% to 0.018%, the powder is cast in vacuum to form a cast ingot, the alloy cast ingot is roughly crushed and conveyed into a ball mill so as to be ground into powder of different grain diameters, and pure nitrogen protective thermal treatment is then performed; alloy smelting is performed in a magnesia crucible open-type medium-frequency induction furnace, after alloy smelting is finished, the alloy is manufactured into a strip through a strip flinging machine according to a high-speed cooling method, and the strip is crushed into powder; and the Fe-Si powder is added to a 0.25% phosphoric acid solution when parched and fried to be at the temperature of about 80 DEG C, and surface passivation treatment is performed. The powder can be further pressed into a powder core. The limitation of the content of an impurity of C is broken, a novel high-quality Fe-Si-Al soft magnetic material which is low in oxygen content, magnetic conductivity and power consumption can be manufactured, thermal treatment time is short, the temperature is low, energy is saved, and environmental friendliness is achieved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a soft magnetic powder of sendust and a process for preparing a magnetic powder core. Background technique [0002] In the 1930s, when Japan’s Tatsuji Yamamoto et al. studied the magnetic properties of Fe–Si-Al ternary alloys, they found that alloys with 9.5% Si and 5.5% Al with the rest being Fe had excellent soft magnetic properties, which was called Sendust. Alloy, initial permeability μ o ~35100, maximum permeability μm~120000, saturation magnetic induction Bs~1.05Ts (Tesla), residual magnetic induction Br~3350Gs (Gauss), resistivity ρ~81μΩ.cm, and magnetocrystalline anisotropy constant K 1 It is close to zero, the magnetostriction coefficient λs is zero, and the magnetism is less sensitive to stress. The only disadvantage is that the hardness of the alloy is Hv ~ 500, which cannot be rolled into thin strips like ordinary silicon steel sheets (containing 3.5% Si),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C38/40H01F1/147H01F1/20
Inventor 姚国忠
Owner 江苏启诚磁业有限公司
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