Manufacturing method of high permeability low power consumption Fe-Si-AI magnetic powder cores

A technology with high magnetic permeability and manufacturing method, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc. The effect of reducing power loss, low production cost, and improving magnetic permeability

Inactive Publication Date: 2013-04-24
HUNAN KANGLI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current sendust magnetic powder core raw material alloy powder has large fluctuations in composition, high oxygen content, difficulty in controlling the particle shape, and unreasonable particle size distribution ratio of the powder, which leads to a decline in the performance of the sendust magnetic powder core and unstable product quality. The production process of sendust aluminum raw material alloy powder adopts vacuum induction melting, which requires large equipment investment, complicated operation process and high production cost.
The deficiencies of FeSiFro magnetic powder cores limit its wide application in the industrial field

Method used

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  • Manufacturing method of high permeability low power consumption Fe-Si-AI magnetic powder cores
  • Manufacturing method of high permeability low power consumption Fe-Si-AI magnetic powder cores
  • Manufacturing method of high permeability low power consumption Fe-Si-AI magnetic powder cores

Examples

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Effect test

Embodiment 1

[0032] Put industrial pure iron, polysilicon, pure aluminum into a nominal 100 kg of raw materials in a non-vacuum induction furnace and cover with a protective agent for smelting. The protective agent is 0.5 kg. The melt composition of the alloy weight percentage is: Si 9.5%, Al 6.0%, C 0.014%, O 0.036%, N 0.008%, and the balance is Fe. The melt is atomized into alloy powder by ultra-high pressure water atomization powder making device, and then the powder is placed in a heat treatment furnace filled with hydrogen atmosphere. Keep warm for 2 hours at 900-1000°C for annealing treatment, and sieve the alloy powder after annealing treatment, according to -100 mesh to +150 mesh accounting for 15%, -150 to +250 mesh accounting for 55%, -250 mesh Mesh ~ +300 mesh accounted for 25%, -300 mesh accounted for 5% of the particle size distribution for insulation treatment, adding 1.5% of the total weight of the alloy powder binder and release agent, so that the density of the finished pro...

Embodiment 2

[0035] The manufacturing process is the same as in Example 1, with the same input of 100 kg of nominal raw materials, 0.7 kg of protective agent, and the chemical composition of the alloy is Si 9.8%, Al 5.6%, C 0.014%, O=0.032%, N=0.008% , the balance being Fe. The melt is atomized into alloy powder by ultra-high pressure water atomization powder making device. After annealing treatment, the particle size distribution is as follows: -100 mesh to +150 mesh accounts for 20%, -150 mesh to +250 mesh accounts for 50%, and -250 mesh accounts for 50%. ~+300 meshes account for 20%, and -300 meshes account for 10% to carry out insulation treatment, add binding agent and release agent (the addition amount of binding agent and release agent is the same as embodiment 1), and compression molding makes the finished product The density is 6.36g / cm 3 , Carry out heat treatment through 750 ℃ ​​of insulations for 60 minutes, thereafter technology is the same as embodiment 1. Wherein, the prot...

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Abstract

The invention relates to a manufacturing method of high permeability low power consumption Fe-Si-AI magnetic powder cores. The method includes the following steps: adopting protective agents to cover a non-vacuum medium-frequency induction furnace for smelting Fe-Si-AI alloy melt; atomizing the Fe-Si-AI alloy melt into alloy powder through an ultrahigh pressure water atomization powder processing device, then carrying out screening and classifying after annealing process on the alloy powder; distributing the powder with the following grain sizes: 15% in -100 meshes-150 meshes, 55% in -150 meshes-250 meshes, 25% in -250 meshes-300 meshes and 5% in -300 meshes; and adopting insulating treatment on the Fe-Si-AI alloy powder, adding binding agents and release agents, molding through compression, and obtaining the Fe-Si-AI magnetic powder cores after heat treatment. The manufacturing method has the advantages of adopting the non-vacuum medium-frequency induction furnace for alloy smelting, being low in smelting cost, small in device investment, and convenient to operate in the production process compared with an existing vacuum medium-frequency induction furnace which is in use. Through reasonable proportioning of size grading and size distribution of the Fe-Si-AI alloy powder, the packing density of the Fe-Si-AI alloy powder is enabled to be the best. Magnetic permeability of the Fe-Si-AI magnetic powder cores is greatly improved, and power loss of the Fe-Si-AI magnetic powder cores is reduced.

Description

technical field [0001] The invention belongs to a manufacturing method of a magnetic object, in particular to a manufacturing method of a sendust magnetic powder core with high magnetic permeability and low power consumption. This sendust magnetic powder core is mainly suitable for making inductor cores and filter inductor cores on switching power supplies. Background technique [0002] At present, the rapid development of switching power supply and UPS requires magnetic components with high magnetic permeability, high saturation magnetic flux density, low loss at high frequency operation, and small decrease in magnetic permeability after adding a DC bias magnetic field. The iron powder cores used in large quantities have low magnetic permeability (μe=75), and the core loss is large. The magnetic permeability of sendust magnetic powder cores can reach μe=125, and the saturation magnetic flux can reach about 1.5T (Tesla). , the magnetostriction coefficient is close to zero, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02C22C33/04B22F9/08
Inventor 郑燕清朱协彬王红军周翠娥
Owner HUNAN KANGLI NEW MATERIAL TECH
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