Low-remanence nanocrystalline magnetic core and preparation method thereof

A nanocrystalline, low remanence technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of high remanence, limited application range, and high production cost of iron-based nanocrystalline cores, and achieve Improve the saturation magnetic induction intensity, increase the quality factor, and reduce the effect of loss value

Active Publication Date: 2017-10-17
DONGGUAN DAZHONG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still 50% nickel in the iron-nickel magnetic core, which is expensive and high in production cos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation method of a nanocrystalline magnetic core with low remanence, comprising the steps of:

[0054] (1) Vacuum isothermal annealing of the iron-nickel-based nanocrystalline strips prepared by the single-roller melt rotary rapid quenching method at a temperature of 450°C and a vacuum degree of 0.0005Pa for 1h, then furnace cooling to 250°C, and holding for 0.5h. Then water cooled to room temperature;

[0055] (2) Crushing the iron-nickel-based nanocrystalline strip to obtain nanocrystalline metal powder, performing ball milling on the nanocrystalline metal powder, and sieving into 70% of the first powder passing through -200 mesh and 30% of the first powder passing through -150~+200 mesh second powder;

[0056] (3) Take the first powder and add an appropriate amount of water to prepare a suspension with a mass fraction of 30%, then add the first insulating coating agent, stir evenly, disperse ultrasonically for 15 minutes, filter, dry, crush and grind until th...

Embodiment 2

[0082] A preparation method of a nanocrystalline magnetic core with low remanence, comprising the steps of:

[0083] (1) Vacuum isothermal annealing of the iron-nickel-based nanocrystalline strips prepared by the single-roller melt rotary rapid quenching method at a temperature of 460°C and a vacuum degree of 0.0008Pa for 1.2h, cooled to 280°C in the furnace, and kept for 0.8h , and then water cooled to room temperature;

[0084] (2) Crushing the iron-nickel-based nanocrystalline strip to obtain nanocrystalline metal powder, performing ball milling on the nanocrystalline metal powder, and sieving into 75% of the first powder passing through -200 mesh and 25% of the first powder passing through -150~+200 mesh second powder;

[0085] (3) Take the first powder and add an appropriate amount of water to prepare a suspension with a mass fraction of 35%, then add the first insulating coating agent, stir evenly, disperse ultrasonically for 18 minutes, filter, dry, crush and grind to ...

Embodiment 3

[0111] A preparation method of a nanocrystalline magnetic core with low remanence, comprising the steps of:

[0112] (1) Vacuum isothermal annealing of the iron-nickel-based nanocrystalline strips prepared by the single-roller melt rotary rapid quenching method at a temperature of 475°C and a vacuum degree of 0.001Pa for 1.5h, then cooled to 300°C in the furnace, and kept for 1h. Then water cooled to room temperature;

[0113] (2) Crushing the iron-nickel-based nanocrystalline strip to obtain nanocrystalline metal powder, performing ball milling on the nanocrystalline metal powder, and sieving into 80% of the first powder passing through -200 mesh and 20% of the first powder passing through -150~+200 mesh second powder;

[0114] (3) Take the first powder and add an appropriate amount of water to prepare a suspension with a mass fraction of 40%, then add the first insulating coating agent, stir evenly, disperse ultrasonically for 20 minutes, filter, dry, crush and grind to a p...

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Abstract

The invention relates to the technical field of high frequency inverter power supplies, in particular to a low-remanence nanocrystalline magnetic core and a preparation method thereof. The preparation method includes the following steps: performing vacuum isothermal annealing on a Fe-Ni based nanocrystalline ribbon prepared by the single roller melt rotation rapid quenching method, and water-cooling the Fe-Ni based nanocrystalline ribbon to the indoor temperature; crushing the Fe-Ni based nanocrystalline ribbon into nanocrystalline metallic powder, performing ball-milling and shaping on the nanocrystalline metallic powder, screening the powder into first powder and second powder; evenly mixing the processed first powder and the processed second powder, pressing the mixed powder into a magnetic core; putting the formed magnetic core in a vacuum annealing furnace to perform heat treatment; performing heat treatment again; and performing glue dipping and curing treatment on the nanocrystalline magnetic core. The preparation method is simple in process, and is low in production cost; the acquired magnetic core finished product has high saturation flux density, low a loss value, low coercivity, low remanence, and high temperature resistance, is excellent in comprehensive performance, will not be damaged, and is improved in reliability.

Description

technical field [0001] The invention relates to the technical field of high-frequency inverter power supplies, in particular to a nanocrystalline magnetic core with low remanence and a preparation method thereof. Background technique [0002] Soft magnetic materials are magnetic materials with low coercive force and high magnetic permeability. Soft magnetic materials are easy to magnetize and demagnetize, so they are widely used in electrical equipment and electronic equipment. Among them, iron-based amorphous alloy is a commonly used iron core soft magnetic material, which is mainly composed of Fe element and Si and B-type metal elements. It has high saturation magnetic induction, high magnetic permeability and low core loss, etc. Features, can be widely used in distribution transformers, high-power switching power supplies, pulse transformers, magnetic amplifiers, intermediate frequency transformers and inverter cores. [0003] The patent application document with the app...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/153H01F1/24C22C38/08C22C38/10C22C38/02C22C38/12C22C38/16C22C33/02C22C38/46C22C38/50C22C38/58C22C38/04C22C38/44C22C38/48C22C38/52C22C38/42C22C38/54C22C38/34
CPCC22C33/0285C22C38/002C22C38/02C22C38/04C22C38/105C22C38/12C22C38/16C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/58H01F1/15333H01F1/24H01F41/0246
Inventor 梁文超李正中李经伟
Owner DONGGUAN DAZHONG ELECTRONICS
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