A DC bias resistant iron-base nanocrystalline alloy magnetic core and preparation method thereof

A technology of iron-based nanocrystals and iron-based alloys, which is applied in the manufacture of magnetic cores, transformer/inductor cores, inductors/transformers/magnets, etc., can solve the problem of insufficient anti-saturation ability and anti-DC bias current characteristics, and large performance changes , large attenuation and other problems, to achieve good anti-DC-Bias characteristics, good anti-saturation ability, and low loss effect

Inactive Publication Date: 2019-01-11
江西中磁科技协同创新有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing 1K107 iron nanocrystalline magnetic core has good high magnetic permeability and low loss, its anti-saturation ability and anti-DC bias current characteristics are insufficient, and it will quickly saturate in a circuit with a DC component, resulting in poor EMI filtering effect
Existing ferrite cores have low magnetic permeability, low Bs value, poor saturation resistance, and are sensitive to temperature. As the temperature changes, its performance changes greatly and its attenuation is large

Method used

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  • A DC bias resistant iron-base nanocrystalline alloy magnetic core and preparation method thereof
  • A DC bias resistant iron-base nanocrystalline alloy magnetic core and preparation method thereof

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Embodiment 1

[0022] The anti-DC bias iron-based nanocrystalline alloy magnetic core of the present invention is made of iron-based alloy material, said iron-based alloy material contains Si, B, Nb, M, Fe, Cu, and M is Ni, Co, Cr, Ga or In, the proportion by weight of each component is Si 10%, B 8%, Nb 4%, Cu 1.5%, M 9%, and the rest is Fe. In this embodiment, M is Ni.

[0023] The preparation method comprises the following steps:

[0024] Step 1: Put the prepared raw materials into a non-vacuum induction furnace for uniform melting, and then pour them into a cooling cast pan to form an alloy steel ingot; the melting temperature is 1500°C, and the melting time is 110 minutes.

[0025] Step 2: Put the alloy steel ingot obtained in step 1 into the intermediate frequency induction melting furnace of the belt spraying equipment, and conduct a second uniform melting. The melting temperature is 1300°C and the melting time is 80 minutes, and then pour the molten steel into the preheated tundish ,...

Embodiment 2

[0030] The anti-DC bias iron-based nanocrystalline alloy magnetic core of the present invention is made of iron-based alloy material, said iron-based alloy material contains Si, B, Nb, M, Fe, Cu, and M is Ni, Co, Cr, Ga or In, the proportion by weight of each component is Si 11%, B 9%, Nb 3%, Cu 2%, M 10%, and the rest is Fe, and M is selected as Co in this embodiment. In embodiment two, the preparation method is the same as embodiment one.

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Abstract

The invention relates to a DC bias resistant iron-based nanocrystalline alloy magnetic core and a preparation method thereof, wherein the weight proportion of each component of the iron-based alloy material is Si 9-12%, B 7-10%, Nb 3- 5%, Cu 1-2%, M 6-12%, the balance bee Fe, M being Ni, Co, Cr, Ga or In. A DC-biased iron-base nanocrystalline alloy magnetic core of the invention can maintain a high constant permeability in a wide frequency range, and has good saturation resistance and DC-Bias resistance at the same time.

Description

technical field [0001] The invention relates to an anti-DC bias iron-based nanocrystalline alloy magnetic core and a preparation method thereof. Background technique [0002] DC components caused by leakage current and capacitive coupling inevitably exist in power supply design circuits. Therefore, EMI common mode inductors in power supply design circuits are required to have certain anti-saturation capabilities and anti-DC-Bias (anti-DC bias) characteristics. Although the existing 1K107 iron nanocrystalline magnetic core has good high magnetic permeability and low loss, its anti-saturation ability and anti-DC bias current characteristics are insufficient, and it will quickly saturate in a circuit with a DC component, resulting in poor EMI filtering effect. The existing ferrite core has low magnetic permeability, low Bs value, poor saturation resistance, and is sensitive to temperature. Its performance changes greatly and its attenuation is large as the temperature changes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F27/25H01F41/02
CPCH01F1/14766H01F27/25H01F41/0213
Inventor 周国华李忞毛文龙黄从伟
Owner 江西中磁科技协同创新有限公司
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