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Soft magnetic alloy powder, magnetic powder core and preparation methods thereof

A technology for preparing soft magnetic alloys and powders, which is applied in the direction of magnetism of inorganic materials, can solve the problems of Ni content in HighFlux magnetic core, poor DC superposition characteristics, and unfavorable miniaturization of devices, so as to achieve good DC superposition characteristics and improve DC superposition characteristics, the effect of low loss

Active Publication Date: 2012-06-13
武汉中磁浩源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main components of Sendust are Fe, Si and Al, which are characterized by relatively low cost and low loss. The disadvantage is that under the condition of DC superposition, the magnetic permeability decreases relatively quickly; the main components of HighFlux are Fe and Ni, which are characterized by DC superposition characteristics. Very good, but the disadvantage is that the cost is relatively high and the loss is relatively high
The above two cores have problems that need to be further optimized in practical applications. The problem with the Sendust core is that it is relatively large in size, which is not conducive to the miniaturization of the device; HighFlux has core heating and cost issues.
[0004] Due to the fact that the existing product Sendust magnetic core has the problem of large volume caused by poor DC superposition characteristics in practical applications; the HighFlux magnetic core has heat generation problems and cost problems due to high Ni content, and the actual application conditions are limited.

Method used

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  • Soft magnetic alloy powder, magnetic powder core and preparation methods thereof
  • Soft magnetic alloy powder, magnetic powder core and preparation methods thereof
  • Soft magnetic alloy powder, magnetic powder core and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In one embodiment of the present invention, M is selected as Mn, wherein x, y and z can take the following values ​​respectively: x=3.6, y=0.6, z=2, namely the expression of soft magnetic alloy powder is Fe 93.8 Si 3.6 C 0.6 mn 2 .

[0028] Adopt mass percentage as Fe 93.8 Si 3.6 C 0.6 mn 2 The alloy was subjected to water atomization test, and the prepared powder morphology was as follows figure 1 shown. The relevant performance parameters of the powder are listed in the following table:

[0029] performance parameter

Fe 93.8 Si 3.6 C 0.6 mn 2

Powder oxygen content

3200ppm

powder bulk density

3.2g / cm 3

[0030] powder tap density

4.6g / cm 3

[0031] The powder is passivated with a strong oxidant, and then pressed into a magnetic core after insulation, bonding and lubrication. The magnetic core is isothermally annealed at 520 ° C for 10 minutes in a hydrogen atmosphere. The annealing temp...

Embodiment 2

[0036] Adopt the Fe in the composition scope of the present invention 95 Si 2.5 C 1 mn 1.5 , Fe 92.5 Si 5 C 1 mn 1 V 0.5 , Fe 91.4 Si 7 C 0.6 mn 1.5 Alloys and Fe beyond the scope of the alloy composition of the present invention 86 Si 12 C 1 mn 1 Alloys (Si content is too high beyond the scope of the present invention 2<x<8) were subjected to water atomization tests to prepare powders, and the relevant performance parameters of the powders are listed in the following table.

[0037]

[0038] The above powder is passivated with a strong oxidant, and then pressed into a magnetic core after insulation, bonding and lubrication. The magnetic core is isothermally annealed at 520°C for 10 minutes in a hydrogen atmosphere. The annealing process is the same as in Example 1. The properties of the core after annealing are listed in the table below:

[0039]

[0040] It can be seen from the above table that when the Si content is within the scope of the present invent...

Embodiment 3

[0042] In FeSiCM (M is selected from Cr, V, Al and Mn) alloy system, choose M to be Cr, adopt the Fe in the composition scope of the present invention 92 Si 3 C 1 Cr 4 , Fe 92.5 Si 4 C 1.5 Cr 2 , Fe 90 Si 6.5 C 2.5 Cr 1 Alloys and Fe beyond the scope of the composition of the present invention 85 Si 6.5 C 2.5 Cr 6 Alloy (Cr content is too high beyond the scope of the present invention 1 < z < 5 to carry out water atomization test preparation powder, powder related performance parameters are listed in the following table:

[0043]

[0044] Passivate the above powder with a strong oxidant, and press it into a magnetic core after insulation, bonding and lubrication. The magnetic core is isothermally annealed at 520 ° C for 10 minutes under a hydrogen atmosphere. The annealing process is the same as in Example 1. After annealing The properties of the cores are listed in the table below:

[0045]

[0046] It can be seen from the above table that in the FeSiCM (...

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Abstract

The embodiment of the invention provides soft magnetic alloy powder. The components of the soft magnetic alloy powder meet the following formula in mass percentage: Fe100- x-y-zSixCyMz, wherein x is more than 2 and less than 8, y is more than 0.5 and less than 3, z is more than 1 and less than 5, and M is at least one of Cr, V, Al and Mn. The embodiment of the invention also provides a magnetic powder core which is prepared from the soft magnetic alloy powder. The soft magnetic alloy powder contains a great amount of Fe, so that saturation magnetic induction strength is higher; the powder contains an adequate amount of Si and C, so that the powder has high soft magnetic property; and the powder contains M (M is at least one of Cr, V, Al and Mn), so that the powder has good process characteristics. The soft magnetic alloy powder and the magnetic powder core having high saturation magnetic induction strength and low loss are obtained so as to obviously improve the characteristics of theDC superposition characteristic of the magnetic core and solve the problem of magnetic core heating.

Description

technical field [0001] The invention relates to a magnetic functional material, in particular to a soft magnetic alloy powder, a magnetic powder core and a preparation method thereof. Background technique [0002] The existing metal soft magnetic alloy magnetic powder cores mainly fall into three categories: Sendust, MPP and HighFlux. Among them, the MPP magnetic powder core has super stability and is suitable for relatively harsh conditions of use. At present, most of it is used in military electronic devices, and it is less used in civilian electronic devices, and the overall consumption is relatively small; Sendust and HighFlux magnetic powder cores are Two types of magnetic core materials widely used in civilian electronic devices. [0003] The main components of Sendust are Fe, Si and Al, which are characterized by relatively low cost and low loss. The disadvantage is that under the condition of DC superposition, the magnetic permeability decreases relatively quickly; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/22
Inventor 陈艳
Owner 武汉中磁浩源科技有限公司