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Composite magnetic powder and preparation method therefor

A magnetic powder core and magnetic powder technology, applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc., can solve the problems of improving magnetic permeability, high high frequency loss, unstable strength of insulating layer, etc. effect of increasing saturation magnetization and permeability

Inactive Publication Date: 2017-03-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the commonly used sendust magnetic powder core preparation method at home and abroad adopts the insulation coating process, and the non-magnetic insulating layer used dilutes the magnetism, resulting in low magnetic permeability; the insulating layer is unstable (pyrolysis) and low in strength (magnetic powder core pressing The cladding layer is easily crushed during the molding process) resulting in high high frequency loss
In addition, the currently commonly used sendust magnetic powder is not flat enough, which is not conducive to further improving the magnetic permeability and reducing high-frequency loss

Method used

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preparation example Construction

[0028] The invention provides a kind of preparation method of composite magnetic powder, comprises the following steps:

[0029] a) Using a melt quenching method to prepare sendust aluminum alloy strips; during the preparation process, applying a directional magnetic field when the strips are thrown; breaking the prepared sendust aluminum alloy thin strips to obtain sendust aluminum alloy fragments;

[0030] b) Mixing and ball milling the sendust powder and ferrite powder to obtain composite magnetic powder.

[0031] In the preparation method provided by the present invention, sendust aluminum strips are firstly prepared. The invention adopts the melt rapid quenching method to prepare the iron-silicon-aluminum alloy thin strip, and always applies a directional magnetic field during the strip throwing process. In the present invention, the magnetic field strength of the orientation magnetic field is preferably 500-2000 Oe, more preferably 1000-1200 Oe. In the present inventio...

Embodiment 1

[0055] (1) In the induction type melt quenching equipment, prepare a standard composition iron-silicon-aluminum alloy strip (5.4wt% Al, 9.6wt% Si, the rest Fe) with a thickness of 5-15 μm. During the preparation of the alloy strip, the strip The rotational speed of the copper roller is 60m / s, and a directional magnetic field of 1000Oe is always applied during the belt throwing process. After the sendust strip is obtained, it is crushed in a stainless steel tank to obtain sendust fragments.

[0056] (2) with FeCl 3 , ZnCl 2 and MnCl 2 4H 2 O is the raw material, according to Mn 0.4 Zn 0.6 Fe 2 o 4 Middle Fe 3+ , Zn 2+ , Mn 2+ The molar ratio n[Fe 3+ ]:n[Zn 2+ ]:n[Mn 2+ ]=10:3:2 Weigh the required raw materials respectively, add an appropriate amount of deionized water, stir continuously to dissolve the raw material particles completely, and obtain a Fe-Zn-Mn mixed salt solution, heat it to 80°C, and drop in a concentration of 2mol / L of NaOH solution, stirred cons...

Embodiment 2～5

[0061] Referring to the preparation method of Example 1, the mass ratios of manganese-zinc-ferrite powder and sendust-aluminum fragments were sequentially adjusted to 4%, 6%, 10%, and 20%, to prepare composite magnetic powder core products.

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Abstract

The invention belongs to the preparation field of a magnetic material, and particularly relates to composite magnetic powder and a preparation method therefor. The preparation method comprises the following steps of a), preparing an iron-silicon-aluminum alloy (which also can be called as sendust in the specification) thin belt by a melt rapid quenching method; in the preparation process, applying a directional magnetic field in belt-spinning; and performing crushing on the prepared iron-silicon-aluminum alloy thin belt to obtain an iron-silicon-aluminum alloy fragment; b), enabling the iron-silicon-aluminum alloy fragment and ferrite powder to be mixed and ball grinded to obtain composite magnetic powder; and c), enabling a binder, a lubricating agent and the composite magnetic powder to be mixed and pressed in sequence to obtain a composite magnetic powder core. Experiment results prove that the effective magnetic conductivity of the magnetic powder core prepared by the method can be higher than 40 at the test frequency of 100kHz; and the loss is lower than 83W / kg in the test conditions of 100kHz when Bm is equal to 300mT.

Description

technical field [0001] The invention belongs to the field of magnetic material preparation, and in particular relates to a preparation method of composite magnetic powder and composite magnetic powder core. Background technique [0002] Sendust soft magnetic alloy, also known as Sendust alloy, has a chemical composition of 5.4wt.% Al, 9.6 [0003] wt.% Si, the rest is Fe (85wt.%). Sensil is very brittle and is easily broken into powder. It is generally prepared as a magnetic powder core for use. [0004] Compared with iron-silicon cores and iron powder cores, sendust magnetic powder cores have lower high-frequency loss, and have higher saturation magnetic induction and magnetic permeability, and are inexpensive, which is conducive to miniaturization. In addition, the magnetostriction coefficient λ of sendust s Close to zero, it is beneficial to eliminate the auditory frequency noise generated when the filter inductor is working. Due to the characteristics of low loss, lo...

Claims

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Application Information

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IPC IPC(8): H01F1/33H01F41/02
CPCH01F1/33H01F41/0246
Inventor 何玉定杨元政谢致薇陈先朝
Owner GUANGDONG UNIV OF TECH
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