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Method for preparing metal powder of nanocrystalline magnetic cores with magnetic permeability mu of 60

A metal powder, nanocrystalline technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of difficult application, general DC bias capability, high price, etc., to achieve low production costs, improve DC The effect of bias capability, high quality factor

Inactive Publication Date: 2012-10-17
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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  • Method for preparing metal powder of nanocrystalline magnetic cores with magnetic permeability mu of 60
  • Method for preparing metal powder of nanocrystalline magnetic cores with magnetic permeability mu of 60
  • Method for preparing metal powder of nanocrystalline magnetic cores with magnetic permeability mu of 60

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preparation example Construction

[0020] The preparation method of metal powder for magnetic permeability μ=60 nanocrystalline magnetic core comprises the following steps:

[0021] 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;

[0022] 2) crushing the nanocrystalline thin ribbon to obtain nanocrystalline metal powder;

[0023] 3) performing ball milling on the nanocrystalline metal powder;

[0024] 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;

[0025] 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 coatin...

example 1

[0028] 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

[0030] 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 method for preparing metal powder of nanocrystalline magnetic cores with magnetic permeability mu of 60. The method comprises the steps that: heat treatment for iron-based amorphous ribbons is carried out to produce nanocrystalline ribbons, wherein the iron-based amorphous ribbons are prepared with a rapid cooling method; the iron-based amorphous ribbons consist of, on a mass basis, 3-15% of Ni, 1-10% of Si, 1-4% of B, 1-9% of Al, and the balance being of Fe; the nanocrystalline ribbons are broken to obtain nanocrystalline metal powder; ball milling shaping of the nanocrystalline metal powder is carried out; the nanocrystalline metal powder is screened; and powder particle composition comprises 90%-98% of the first powder which is screened by using a sieve with a size of -200 meshes and 2%-10% of second powder is screened by using a sieve with a size of -150-+200 meshes. According to the technical scheme, nanocrystalline magnetic cores with magnetic permeability mu of 60 are prepared; magnetic permeability, loss value and direct current bias capability of the magnetic cores are stable.

Description

[0001] This application is [0002] The application date is: June 20, 2012 [0003] The application number is: 201210208100.4 [0004] The title of the application is: divisional application of the patent application for the preparation method of high-performance nanocrystalline magnetic powder core. technical field [0005] The invention relates to a method for preparing metal powder for a nanocrystalline magnetic core with a magnetic permeability μ=60. Background technique [0006] 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-freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04H01F1/047H01F1/08H01F41/02
Inventor 肖洪武周水泉柯昕汪建国
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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