Preparation method of metal powder for nanocrystalline magnetic core

A metal powder and nanocrystalline technology, which is applied in the field of preparation of metal powder for nanocrystalline magnetic cores, can solve the problems of high price, general DC bias ability, and difficult application, and achieve low production costs, improve DC bias ability, The effect of a high quality factor

Active Publication Date: 2014-09-03
ZHEJIANG KEDA MAGNETOELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the DC bias capability of the MPP magnetic powder core is average, and the MPP magnetic powder core also contains precious metals such as nickel and molybdenum, which are expensive, making it difficult to be widely used.

Method used

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  • Preparation method of metal powder for nanocrystalline magnetic core
  • Preparation method of metal powder for nanocrystalline magnetic core
  • Preparation method of metal powder for nanocrystalline magnetic core

Examples

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preparation example Construction

[0016] A method for preparing a high-performance nanocrystalline magnetic powder core, comprising the steps of:

[0017] 1) Heat-treat the iron-based amorphous ribbons prepared by the rapid cooling method to transform them into nanocrystalline ribbons; wherein, the mass percentage of the iron-based amorphous ribbons is: 3-15% Ni, 1-10% Si, 1~4%B, 1~9%Al, the balance is Fe;

[0018] 2) crushing the nanocrystalline thin ribbon to obtain nanocrystalline metal powder;

[0019] 3) performing ball milling on the nanocrystalline metal powder;

[0020] 4) Screen the nanocrystalline metal powder, and then mix it into a powder consisting of 90% to 98% of the first powder passing through -200 mesh and 2% to 10% of the second powder passing through -150 to +200 mesh Powder particle distribution;

[0021] 5) Mixing the mixed nanocrystalline metal powder with an adhesive to form a magnetic core by pressing; and annealing the formed magnetic core, and then coating the magnetic core with a...

example 1

[0024] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 580° C. for 1 hour to obtain nanocrystalline thin strips; they were broken and shaped; 90% of the first powder of -200 mesh was selected and 10% of the second powder of -150~+200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 1 with the specifications of Φ26.9 / Φ14.7×11.2 (that is, the outer diameter is 26.9mm, the inner diameter is 14.7mm, and the height is 11.2mm) is obtained.

example 2

[0026] Heat-treat the iron-based amorphous thin strips prepared by the rapid cooling method in an inert gas at 620° C. for 1 hour to obtain nanocrystalline thin strips; crush and shape them; select 90% of the first powder of -200 mesh and 10% of the second powder of -150~+200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 2 with specifications of Φ26.9 / Φ14.7×11.2 (that is, outer diameter 26.9mm, inner diameter 14.7mm, height 11.2mm) was obtained.

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Abstract

The invention discloses a preparation method of a metal powder for a nanocrystalline magnetic core. The preparation method comprises the following steps of: carrying out heat treatment on an iron-based amorphous thin ribbon made by using a rapid cooling method; converting the iron-based amorphous thin ribbon into a nanocrystalline thin ribbon, wherein the iron-based amorphous thin ribbon comprises the following components in percentage by mass: 3-15% of Ni, 1-10% of Si (Silicon), 1-4% of B (Boron), 1-9% of Al (Aluminum) and the balance of Fe (Ferrum); crushing the nanocrystalline thin ribbon to obtain nanocrystalline metal powder; ball-milling and shaping the nanocrystalline metal powder; screening the nanocrystalline metal powder; and then mixing the nanocrystalline metal powder to achieve powder particle distribution, wherein the powder particle distribution is formed by 90-98% of first powder passing through -200 meshes and 2-10% of second powder passing through (-150)-(+200) meshes. According to the technical scheme, the preparation method is used for preparing the nanocrystalline magnetic core with magnetic permeability mu of 26-90; and the magnetic core has the advantages of stable magnetic permeability, stable dissipation value and stable direct current biasing capacity.

Description

technical field [0001] The invention relates to a preparation method of metal powder for nanocrystalline magnetic core. Background technique [0002] In power electronic equipment, noise is the main source of circuit interference, so various filter devices must be used to reduce noise. As the main component of the differential mode inductor, the magnetic powder core plays a key role in the filter. At present, the magnetic powder core products mainly include iron powder cores, sendust magnetic powder cores, iron-nickel magnetic powder cores, MPP magnetic powder cores, etc. Conventional iron powder cores are cheap, but have poor high-frequency characteristics. Now when designing and manufacturing various switching power supply choke coils and inductors, sendust magnetic powder cores, iron-nickel magnetic powder cores and MPP magnetic powder cores are basically used. [0003] Compared with iron powder cores, sendust magnetic powder cores have very low core loss, and their fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04C21D9/52C21D1/74H01F1/08
Inventor 肖洪武周水泉柯昕汪建国
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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