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Metal powder for preparing nanocrystalline magnetic core

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

Inactive Publication Date: 2012-10-03
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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  • Metal powder for preparing nanocrystalline magnetic core
  • Metal powder for preparing nanocrystalline magnetic core
  • Metal powder for preparing nanocrystalline magnetic core

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] The iron-based amorphous ribbon prepared by the rapid cooling method was heat-treated in an inert gas at 580°C for 1 hour to obtain nanocrystalline ribbons; crushed and shaped; 90% of the first powder with 200 meshes and 10% of the second powder of -150~+200 mesh, mixed with 5wt‰ of sodium silicate, molded by pressing, annealing of the magnetic core, and at the same time blowing nitrogen into the heat treatment furnace, temperature 500℃, time 2 hours, and finally Epoxy paint is used to coat the surface of the magnetic powder core. Obtained 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) nanocrystalline magnetic powder core product 1.

example 2

[0026] The iron-based amorphous ribbon prepared by the rapid cooling method is heat-treated in an inert gas at 620°C for 1 hour to obtain the nanocrystalline ribbon; crush and shape; select 90% of the first powder with -200 mesh and 10% of the second powder of -150~+200 mesh, mixed with 5wt‰ of sodium silicate, molded by pressing, annealing of the magnetic core, and at the same time blowing nitrogen into the heat treatment furnace, temperature 500℃, time 2 hours, and finally Epoxy paint is used to coat the surface of the magnetic powder core. Obtained 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) nanocrystalline magnetic powder core product 2.

example 3

[0028] The iron-based amorphous ribbon prepared by the rapid cooling method is heat-treated in an inert gas at 620°C for 1 hour to obtain the nanocrystalline ribbon; crushed and shaped; 95% of the first powder of -200 mesh is selected and 5% of the second powder with -150~+200 mesh, mixed with 5wt‰ of sodium silicate, molded by pressing, annealing is selected for the magnetic core, and at the same time nitrogen gas is introduced into the heat treatment furnace at a temperature of 500℃ for 2 hours, and finally Epoxy paint is used to coat the surface of the magnetic powder core. Obtained 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) nanocrystalline magnetic powder core product 3.

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Abstract

The invention discloses metal powder for preparing a nanocrystalline magnetic core. The metal powder is prepared according to the following steps: conducting heat treatment on a Fe-based amorphous thin belt obtained according to a rapid cooling method, so as to convert the Fe-based amorphous thin belt into a nanocrystalline thin belt, wherein the Fe-based amorphous thin belt comprises the following ingredients by weight: 3 to 15 percent of Ni, 1 to 10 percent of Si, 1 to 4 percent of B, 1 to 9 percent of Al, and Fe in balancing amount; crushing the nanocrystalline thin belt to obtain nanocrystalline metal powder; conducting ball milling shaping on the nanocrystalline metal powder; and screening the nanocrystalline metal powder, and mixing to obtain powder granules containing 90 to 98 percent of first powder penetrating a -200 mesh and 2 to 10 percent of second powder penetrating a -150 to +200 mesh. The magnetic core prepared according to the technical scheme has stable magnetic permeability, loss value and DC offset capability.

Description

Technical field [0001] The invention relates to a metal powder for preparing nanocrystalline magnetic cores. Background technique [0002] In power electronic equipment, noise is the main source of circuit interference, so various filters must be used to reduce noise. The magnetic powder core, as the main component of the differential mode inductor, plays a key role in the filter. At present, the magnetic powder core products mainly include iron powder core, sendust magnetic powder core, iron-nickel magnetic powder core, MPP magnetic powder core, etc. Conventional iron powder cores are inexpensive, but have poor high-frequency characteristics. Nowadays, when designing and manufacturing various switching power supply chokes and inductors, iron-silicon-aluminum 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 better frequency...

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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