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Preparing method for high-electrical-resistivity iron-based nanocrystalline alloy thin strip

An iron-based nanocrystalline, high-resistivity technology, applied in circuits, electrical components, magnetic materials, etc., can solve the problem of high power density of switching power supplies, low Bs value of ferrite soft magnetic materials, and comprehensive magnetic properties. Poor problems, achieve high magnetic permeability, hinder grain growth, and high Bs value

Inactive Publication Date: 2019-01-01
YICHUN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with iron-based nanocrystalline alloys, ferrite soft magnetic materials have poor comprehensive magnetic properties such as low Bs value and low magnetic permeability, and it is difficult to meet the demand for high power density of switching power supplies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Press Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 The formula is converted into a weight ratio and weighed to prepare 20kg of raw materials. Nb and B are respectively ferroniobium and ferroboron master alloys. Put the raw materials into the vacuum induction furnace for smelting. The feeding sequence is to put the pure iron and ferroniobium into the smelting furnace first, and then add ferroboron and electrolytic copper after heating until they are completely melted. 0.1%, the particle size is 800 mesh SiO 2 Ceramic powder, and then add silicon. The smelting temperature is set at 1550°C, and after smelting for 100 minutes, it is poured into a cooling cast pan to form a ceramic powder-doped iron-based nanocrystalline master alloy steel ingot.

[0014] Put the smelted ceramic powder-doped iron-based nanocrystalline master alloy steel ingot into an intermediate frequency induction melting furnace for secondary remelting at a temperature of 1300°C. After smelting for 80 minutes, pou...

Embodiment 2

[0017] Press Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 The formula is converted into a weight ratio and weighed to prepare 20kg of raw materials. Nb and B are respectively ferroniobium and ferroboron master alloys. Put the raw materials into the vacuum induction furnace for smelting. The feeding sequence is to put the pure iron and ferroniobium into the smelting furnace first, and then add ferroboron and electrolytic copper after heating until they are completely melted. After the ferroboron and electrolytic copper are also completely melted, add mass 0.3%, the particle size is 600 mesh SiO 2 Ceramic powder, and then add silicon. The smelting temperature is set at 1550°C, and after smelting for 100 minutes, it is poured into a cooling cast pan to form a ceramic powder-doped iron-based nanocrystalline master alloy steel ingot.

[0018] Put the smelted ceramic powder-doped iron-based nanocrystalline master alloy steel ingot into an intermediate frequency induction melting furnace for ...

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Abstract

The invention discloses a preparing method for a high-electrical-resistivity iron-based nanocrystalline alloy thin strip. Weighing is conducted according to the formula of Fe<73.5>Cu<1>Nb<3>Si<13.5>B<9>, and raw materials are added into a vacuum induction furnace to be smelted; according to the charging sequence, pure iron and ferroniobium are placed in a smelting furnace, ferroboron and electrolytic copper are added after complete melting, and complete melting is conducted; SiO2 ceramic powder and silicon are added in the obtained melt, smelting is conducted, and a ceramic powder doped iron-based nanocrystalline mother alloy steel ingot is formed; the ceramic powder doped iron-based nanocrystalline mother alloy steel ingot is then placed in a medium-frequency induction smelting furnace tobe subjected to secondary remelting, and molten steel is poured into a pre-heating pressure nozzle bag; and after the temperature of the molten steel is stable, the molten steel is sprayed to a high-speed-rotating copper roller, and then the ceramic powder doped high-electrical-resistivity iron-based nanocrystalline alloy thin strip can be obtained. The prepared iron-based nanocrystalline alloy thin strip has high electrical resistivity, low losses, high Bs value, high permeability and other excellent comprehensive soft magnetic properties.

Description

technical field [0001] The invention belongs to the field of preparation of soft magnetic alloy materials, and relates to a method for preparing iron-based nanocrystalline alloy strips. Background technique [0002] Iron-based nanocrystalline alloy soft magnetic materials have excellent soft magnetic properties such as high Bs, high magnetic permeability, and low coercivity, and are low-cost iron-based materials. They are widely used in switching power supplies for computers, communications, and automotive electronics. , household appliances, electric power and industrial automation control, precision measurement (measurement), new energy and other fields. With the continuous development of high-frequency switching power supply, higher requirements are put forward for the application frequency of soft magnetic materials. Since the iron-based nanocrystalline alloy is a metal material, its resistivity is low, such as the national standard 1K107 material (alloy composition is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/06C22C33/06C22C38/02C22C38/12C22C38/16H01F1/153
CPCB22D11/0611C22C33/006C22C33/06C22C38/002C22C38/02C22C38/12C22C38/16C22C2200/04H01F1/15333H01F1/15341
Inventor 周国华袁秋红皮晓明陈倪莉
Owner YICHUN UNIVERSITY
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