Preparation method of nanometer crystal magnetic powder core with magnetic conductivity mum of 60

A technology of nanocrystals and magnetic permeability, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of general DC bias capability, difficult application, high price, etc., and improve DC bias capability , low production cost and 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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  • Preparation method of nanometer crystal magnetic powder core with magnetic conductivity mum of 60
  • Preparation method of nanometer crystal magnetic powder core with magnetic conductivity mum of 60
  • Preparation method of nanometer crystal magnetic powder core with magnetic conductivity mum of 60

Examples

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preparation example Construction

[0024] A method for preparing a nanocrystalline magnetic powder core with a magnetic permeability μ=60, comprising the steps of:

[0025] 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;

[0026] 2) crushing the nanocrystalline thin ribbon to obtain nanocrystalline metal powder;

[0027] 3) performing ball milling on the nanocrystalline metal powder;

[0028] 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;

[0029] 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 mag...

example 1

[0032] 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

[0034] 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 nanometer crystal magnetic powder core with a magnetic conductivity mumof 60. The method comprises the following steps: thermally treating an iron-based amorphous thin ribbon prepared by a rapid cooling method into a nano-crystalline ribbon, wherein the iron-based amorphous thin ribbon has the following components by weight: 3-15% of Ni, 1-10% of Si, 1-4% of B, 1-9% of Al and the balance of Fe; crushing the nano-crystalline ribbon to obtain nano-crystalline metal powders; conducting ball-milling and shaping the nano-crystalline metal powders; screening the nano-crystalline metal powders, and mixing the nano-crystalline metal powders into powder particle consisting of 90%-98% of first powder screened by a -200-mesh sieve and 2%-10% of second powder screened by a (-150)-(+200)-mesh sieve for distribution; mixing the mixed nano-crystalline metal powders with a bonding agent, and pressing to form the magnetic core; and annealing the formed magnetic core, and then, coating the magnetic core with insulating resin. According to the technical scheme, the magnetic powder core has stable magnetic conductivity, a loss value and direct-current bias ability.

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: Preparation method of high-performance nanocrystalline magnetic powder core [0005] divisional application of the patent application. technical field [0006] The invention relates to a preparation method of a nanocrystalline magnetic powder core with a magnetic permeability μ=60. Background technique [0007] 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 cha...

Claims

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Application Information

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