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A kind of preparation method of low-loss amorphous magnetic powder core

A magnetic powder core, low-loss technology, applied in the field of preparation of low-loss amorphous magnetic powder core, can solve the problems of difficult to eliminate internal stress, high loss of amorphous magnetic powder core, poor high-frequency characteristics, etc. The effect of high crystal formation ability and high density

Active Publication Date: 2020-09-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a low-loss amorphous magnetic powder core to solve the high loss of amorphous magnetic powder cores caused by the difficulty in eliminating internal stress during the preparation of amorphous magnetic powder cores from amorphous powder obtained by traditional strip crushing methods , The problem of poor high-frequency characteristics

Method used

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  • A kind of preparation method of low-loss amorphous magnetic powder core
  • A kind of preparation method of low-loss amorphous magnetic powder core
  • A kind of preparation method of low-loss amorphous magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Fe prepared by the strip crushing method 77 Si 8.5 B 12 P 4 Nb 0.5 Amorphous alloy powder is subjected to magnetic field heat treatment for amorphous powder. Put the amorphous powder in a closed glass bottle, place the bottle in a magnetic field heat treatment furnace, first vacuumize the furnace body, and then heat the amorphous magnetic powder. Set the heat treatment temperature to 400°C. When the temperature rises When the set temperature is reached, apply a transverse magnetic field of 0.5T to the magnetic powder, and perform magnetic field heat treatment. After 30 minutes of heat treatment, turn off the magnetic field, turn off the heating system and the heat preservation system, and wait for the temperature to cool to room temperature, take out the magnetic powder, and use an X-ray diffractometer (XRD ) to detect its structure, the result is as figure 1 As shown in (a), it can be seen that there is no diffraction peak corresponding to any crystal in the XRD p...

Embodiment 2

[0046] Fe prepared by the strip crushing method 77 Si 8.5 B 12 P 4 Mo 0.5 Amorphous alloy powder is subjected to magnetic field heat treatment for amorphous powder. Put the amorphous powder in a closed glass bottle, place the bottle in a magnetic field heat treatment furnace, first vacuumize the furnace body, and then heat the amorphous magnetic powder. Set the heat treatment temperature to 420°C. When the temperature rises When the set temperature is reached, apply a transverse magnetic field of 0.6T to the magnetic powder, and conduct magnetic field heat treatment. After 30 minutes of heat treatment, turn off the magnetic field, turn off the heating system and the heat preservation system, wait until the temperature cools down to room temperature, take out the magnetic powder, and use XRD to detect its structure. XRD There is no diffraction peak corresponding to crystallization on the spectrum, only a broad diffuse scattering peak, indicating that the powder used is comp...

Embodiment 3

[0050] Fe prepared by the strip crushing method 77 Si 8.5 B 12 P 4 Ni 0.5 Amorphous alloy powder is subjected to magnetic field heat treatment for amorphous powder. Put the amorphous powder in a closed glass bottle, place the bottle in a magnetic field heat treatment furnace, first vacuumize the furnace body, and then heat the amorphous magnetic powder. Set the heat treatment temperature to 380°C. When the temperature rises When the set temperature is reached, apply a transverse magnetic field of 0.6T to the magnetic powder, and conduct magnetic field heat treatment. After 30 minutes of heat treatment, turn off the magnetic field, turn off the heating system and the heat preservation system, wait until the temperature cools down to room temperature, take out the magnetic powder, and use XRD to detect its structure. XRD There is no diffraction peak corresponding to crystallization on the spectrum, only a broad diffuse scattering peak, indicating that the powder used is comp...

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Abstract

The invention discloses a preparation method of a low-loss amorphous magnetic powder core, comprising: (1) screening and proportioning amorphous alloy powder; (2) performing magnetic field heat treatment on the above amorphous alloy powder to obtain amorphous magnetic powder (3) insulating and coating the above-mentioned amorphous magnetic powder; (4) drying and pressing the above-mentioned insulating and coating-treated amorphous magnetic powder to obtain a low-loss amorphous magnetic powder core. The amorphous magnetic powder core prepared by the preparation method provided by the invention has high saturation magnetization, high magnetic permeability, low loss of the magnetic powder core, and good DC bias characteristics. It is suitable for various inductive components such as filtering, current stabilization and energy storage on various switching power supply modules.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a preparation method of a low-loss amorphous magnetic powder core. Background technique [0002] With the rapid development of electronic power and information industry, electronic equipment and devices are developing in the direction of miniaturization, high frequency and high current. Traditional magnetic powder cores such as iron powder core, iron silicon powder core, sendust powder core, iron nickel core Powder cores and iron-nickel-molybdenum powder cores have problems such as large loss, heavy weight, low power, and poor stability, which cannot meet their development needs. The main manifestations are: the price of iron powder cores is low, but the high-frequency characteristics and loss characteristics are not good. ;The price of iron-silicon powder core is moderate, and the DC superposition performance is excellent, but the high-frequency loss is high; The c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/153B22F1/00B22F3/02
CPCH01F1/1535H01F1/15383H01F41/0246B22F3/02B22F1/102B22F1/142B22F1/145
Inventor 董亚强刘珉黄柯瑜刘磊李童王新敏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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