Broadband constant-permeability iron-based nanocrystalline alloy magnetic core and preparation method thereof

A technology of iron-based nanocrystals and constant magnetic permeability, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of insufficient anti-saturation ability and anti-DC bias current characteristics, large performance changes, large attenuation, etc., and achieve good Anti-DC-Bias characteristics, good anti-saturation ability, and low loss effect

Active Publication Date: 2020-03-24
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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  • Broadband constant-permeability iron-based nanocrystalline alloy magnetic core and preparation method thereof
  • Broadband constant-permeability iron-based nanocrystalline alloy magnetic core and preparation method thereof

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Embodiment 1

[0023] The iron-based nanocrystalline alloy magnetic core with broadband constant magnetic permeability of the present invention is made of iron-based alloy materials, and the iron-based alloy materials are Si, B, Nb, M, Fe, Cu, and M is Tb, La, Ce, Pr, Nd, One or more of Dy, in this embodiment, Tb is selected as M, and the weight ratio of each component is 13% of Si, 8% of B, 3% of Nb, 1.5% of Cu, 2% of M, and the rest is Fe.

[0024] The preparation method of the iron-based nanocrystalline alloy magnetic core with broadband constant magnetic permeability of the present invention is as follows:

[0025] 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. Nb and B are made of ferroniobium and ferroboron master alloys respectively. The feeding sequence is to put pure iron and ferroniobium int...

Embodiment 2

[0031] The iron-based nanocrystalline alloy magnetic core with broadband constant magnetic permeability 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 Tb, La, Ce, Pr , Nd, Dy in one or more, in the present embodiment, M selects La for use, and the weight ratio of each composition is, Si 12.5%, B 9%, Nb 2.5%, Cu 2%, M 1.5% , and the rest is Fe. In this embodiment, M is selected from La. In embodiment two, the preparation method is the same as embodiment one.

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Abstract

The invention relates to a broadband constant-permeability iron-based nanocrystalline alloy magnetic core and a preparation method thereof. The iron-based alloy material comprises, by weight, 12%-13.5% of Si, 7%-9% of B, 2%-4% of Nb, 1%-2% of Cu, 1%-3% of M and the balance Fe, and M is one or more of Tb, La, Ce, Pr, Nd and Dy. According to the invention, high constant magnetic conductivity can bemaintained under broadband, and good anti-saturation capability and anti-DC-Bias characteristic are provided.

Description

technical field [0001] The invention relates to a broadband constant magnetic permeability 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153
CPCH01F1/15333H01F1/15341
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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