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Manufacturing method of high-magnetic-permeability low-power-consumption iron-silicon-aluminum alloy powder for magnetic powder cores

A technology of sendust and high magnetic permeability, which is applied in the field of manufacturing sendust powder for magnetic powder cores with high magnetic permeability and low power consumption, and can solve the problems of performance degradation of sendust magnetic powder cores, high production costs and poor composition Compositional fluctuations and other problems, to achieve 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 alloy powder has large fluctuations in composition, high oxygen content, difficult control of particle shape, and unreasonable particle size distribution of the powder, which leads to the decline in the performance of the sendust magnetic powder core and unstable product quality. The production process of silicon-aluminum raw material alloy powder adopts vacuum induction melting, which requires large equipment investment, complicated operation process and high production cost.

Method used

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  • Manufacturing method of high-magnetic-permeability low-power-consumption iron-silicon-aluminum alloy powder for magnetic powder cores
  • Manufacturing method of high-magnetic-permeability low-power-consumption iron-silicon-aluminum alloy powder for magnetic powder cores
  • Manufacturing method of high-magnetic-permeability low-power-consumption iron-silicon-aluminum alloy powder for magnetic powder cores

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Experimental program
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Embodiment 1

[0022] Put industrial pure iron, polysilicon and pure aluminum into a non-vacuum induction furnace with a nominal 100 kg of raw materials covered with a protective agent for smelting. The protective agent is 0.5 kg. The weight percentage of the protective agent is: calcium carbonate: 35%, fluorite: 25%, alumina: 40%. The melt composition of sendust aluminum alloy in 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, and then put the powder into a heat treatment furnace filled with hydrogen atmosphere, heat it at 900-1000°C for 2 hours for annealing treatment, and sieve the alloy powder after annealing treatment, according to -100 mesh ~ +150 mesh accounts for 15%, -150~+250 mesh accounts for 55%, -250 mesh~+300 mesh accounts for 25%, and -300 mesh accounts for 5%. Binder and release agent, so that the density of the finished product is 6.14g / m 3 . Put the molded product into a protective atmos...

Embodiment 2

[0024] The manufacturing process is the same as in Example 1, and the same 100 kilograms of raw materials are put into the nominal amount, and the protective agent consumption is 0.7 kilograms. The protective agent is mixed by calcium carbonate, fluorite, and aluminum oxide, and its weight percentage content is calcium carbonate: 45%. Fluorite: 15%, alumina powder: 40%. The chemical composition of sendust is Si 9.8%, Al 5.6%, C 0.014%, O=0.032%, N=0.008%, and the balance is 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), ...

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Abstract

The invention relates to a manufacturing method of a high-magnetic-permeability low-power-consumption iron-silicon-aluminum alloy powder for magnetic powder cores, which comprises the following steps: 1. smelting an iron-silicon-aluminum alloy melt while covering a non-vacuum medium-frequency induction furnace with a protective agent; and 2. atomizing the alloy melt into an alloy powder by using a superhigh-pressure water atomization pulverization device, and carrying out annealing treatment and sieve classification to obtain the finished product. Since the non-vacuum medium-frequency induction furnace is utilized to smelt the alloy, compared with the presently used vacuum induction furnace, the manufacturing method provided by the invention has the advantages of lower cost and less equipment investment, and the production process is convenient to operate. By adjusting the atomization technological parameters of the superhigh-pressure water atomization method, the invention implements control on the particle size distribution and particle shape of the iron-silicon-aluminum alloy powder; and by reasonably adjusting the particle size grading and particle size distribution of the iron-silicon-aluminum alloy powder, the invention can enable the packed density of the iron-silicon-aluminum alloy powder to reach the optimal value, obviously enhance the magnetic permeability of the iron-silicon-aluminum magnetic powder core and lower the power loss.

Description

technical field [0001] The invention belongs to a manufacturing method of a magnetic object, in particular to a manufacturing method of sendust aluminum alloy powder for a 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 coef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C22C33/02B22F9/08
Inventor 郑燕清朱协彬王红军周翠娥
Owner HUNAN KANGLI NEW MATERIAL TECH
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