Metal powder used for preparing nanometer crystal magnetic core

A metal powder and nanocrystalline technology, applied in the field of metal powder, can solve the problems of general DC bias capability, difficult application and high price, and achieve the effect of improving DC bias capability, low production cost and high quality factor

Inactive Publication Date: 2012-09-26
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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  • Metal powder used for preparing nanometer crystal magnetic core
  • Metal powder used for preparing nanometer crystal magnetic core
  • Metal powder used for preparing nanometer crystal magnetic core

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] 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

[0027] 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.

example 3

[0029] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 620°C for 1 hour to obtain nanocrystalline thin strips; they were crushed and shaped; 95% of the first powder of -200 mesh was selected and 5% 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 3 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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PUM

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Abstract

The invention discloses metal powder used for preparing a nanometer crystal magnetic core. The metal powder is prepared by the following steps: carrying out heat treatment on an iron base amorphous thin belt made by using a rapid cooling method, so that the iron base amorphous thin belt is converted into a nanometer crystal thin belt; crushing the nanometer crystal thin belt so as to obtain nanometer crystal metal powder; carrying out ball mill to shaping the nanometer crystal metal powder; and screening the nanometer crystal metal powder, mixing the screened nanometer crystal metal powder composed of 90%-98% of first powder capable of passing through a -200-mesh sieve and 2%-10% of second powder capable of passing through a -150- +200-mesh sieve. The magnetic core prepared from the metal powder has stable magnetic permeance rate, loss value and direct current biasing ability.

Description

technical field [0001] The invention relates to a metal powder for preparing a 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 frequency ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C45/02
Inventor 肖洪武周水泉柯昕汪建国
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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