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Magnetic-field heat treatment method of nanocrystal magnetic core

A heat treatment method and nanocrystalline technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of high coercive force and iron loss of the magnetic core, large inductance attenuation, etc., to achieve coercive force and Reduced iron loss and excellent overall performance

Inactive Publication Date: 2016-06-29
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, in the existing inventions, the inductance attenuation is relatively large, and the coercive force and iron loss of the magnetic core are too high.

Method used

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  • Magnetic-field heat treatment method of nanocrystal magnetic core
  • Magnetic-field heat treatment method of nanocrystal magnetic core
  • Magnetic-field heat treatment method of nanocrystal magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this embodiment, the 20 μm thick amorphous strip is rolled and wound to obtain a ring magnetic core with a size of 20×14×10 mm.

[0050] Step 1: Determine the general heat treatment process by analyzing the thermal properties and crystallization behavior of the alloy and combining the conditions in production practice.

[0051] Step 2: After ordinary heat treatment, analyze and compare the inductance characteristics and soft magnetic characteristics of the magnetic core. At this time, the inductance value of the magnetic core is 14.5μH, and the coercive force of the magnetic core under this heat treatment condition is 1.9A / m, and the magnetic core is at 0.2T, 20kHz The iron loss under the condition is 2.2W / kg, and the iron loss under the condition of 0.5T and 20kHz is 10.8W / kg.

[0052] Step 3: Carry out magnetic field heat treatment in three different magnetization stages under common heat treatment conditions, and the magnetization current is 100A.

[0053] The fi...

Embodiment 2

[0074]In this embodiment, amorphous strips with thicknesses of 18 μm, 20 μm, 22 μm and 24 μm were rolled and wound to obtain a ring magnetic core with a size of 20×14×10 mm. Because the heat treatment process steps and performance change trends of magnetic cores with different strip thicknesses are completely consistent with Embodiment 1, for the purpose of brevity, the accompanying drawings are omitted and not fully given, but under the conditions of TF1 (magnetizing current 140A) magnetic field heat treatment The soft magnetic properties and inductance characteristics are given in detail.

[0075] After ordinary heat treatment, analyze and compare the inductance characteristics and soft magnetic properties of four kinds of magnetic cores with different thicknesses. At this time, the inductance value of the magnetic core is 10-16μH, and the coercive force is 1.9-2.0A / m, and the magnetic core is at 0.2T, 20kHz The iron loss under the condition is 1.7-2.2W / kg, and the iron loss...

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Abstract

The invention discloses a magnetic-field heat treatment method of a nanocrystal magnetic core. According to the method, a transverse magnetic field is applied to heat treatment by combining a known process condition during actual production on the premise of meeting market application demand, the magnetic-field heat treatment process step is particularly considered and refined from different magnetism steps and by changing the size of magnetism current, an optimal magnetism mode of an initial heat preservation temperature of 330 DEG C to a cooling finish step and the additionally-arranged transverse magnetic field is finally obtained, and the size of the magnetism current is preferably 80-140A. The high induction value of the magnetic core sample in such heat treatment condition is maintained, the coercive force and the iron loss are obviously reduced, thus, the comprehensive performance of the magnetic core is more excellent, and the market application prospect of a nanocrystal magnetic core product is expanded.

Description

technical field [0001] The invention belongs to the technical field of nanocrystalline magnetic cores, in particular to a magnetic field heat treatment process for nanocrystalline magnetic cores. Background technique [0002] Soft magnetic materials have magnetic properties such as low coercive force and high magnetic permeability. They are the raw materials for making magnetic cores such as inductors, choke coils, and sensors. They have been widely used in industries such as electric power, motors, and electronics. So far, soft magnetic materials for engineering applications have been divided into metal soft magnetic materials (such as industrial pure iron, silicon steel, permalloy), soft ferrite, non Crystalline and nanocrystalline soft magnetic materials. The relatively high coercive force of traditional metal soft magnetic materials limits its application in the soft magnetic field; soft magnetic ferrite is not conducive to the miniaturization of electronic components d...

Claims

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Application Information

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IPC IPC(8): H01F41/02C21D1/00C21D1/26C22F3/00C22F1/00
CPCH01F41/0226C21D1/04C21D1/26C21D2201/00C21D2201/03C21D2241/00C22F1/00C22F3/00
Inventor 朱方梁江沐风范星都沈宝龙江向荣
Owner SOUTHEAST UNIV
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