Reworking method for nanocrystalline alloy magnetic core

Abstract

The invention discloses a reworking method for a nanocrystalline alloy magnetic core. The method comprises the specific steps: S1, penetrating a defective nanocrystalline alloy magnetic core through a material frame; S2, preheating a transverse magnetic preheating furnace to enable the temperature in a transverse magnetic preheating furnace to reach a first temperature; S3, pushing the defective nanocrystalline alloy magnetic cores penetrating through the material frame into a transverse magnetic heat treatment furnace to be subjected to transverse magnetic heat treatment; S4, in the transverse magnetic heat treatment in the S3, increasing the temperature of the transverse magnetic preheating furnace from the first temperature to the second temperature, carrying out heat preservation for the first time, applying a magnetic field with the magnetic field intensity of 500-800 Gs while carrying out heat preservation, lasting heat preservation for the second time, and after the first heat preservation time, decreasing the temperature in the transverse magnetic preheating furnace to the third temperature, and taking the transverse magnetic preheating furnace out of the furnace; and S5, carrying out quickly air-cooling to normal temperature after discharging. According to the reworking method, defective nanocrystalline magnetic cores occurring in daily production can be effectively treated, and part of nanocrystalline alloy magnetic cores with the inductance low lower limit of 1KHz and 10KHz can be changed into good products from defective products, so that scraped products are reduced, and the material utilization rate is increased.

Description

technical field [0001] The invention relates to the technical field of nanocrystalline material processing, in particular to a method for reworking a nanocrystalline alloy magnetic core. Background technique [0002] The nanocrystalline alloy magnetic core is formed by winding nanocrystalline alloy strips, which are rapidly cooled by high-temperature molten steel in a molten state to form thin strips of 18-30 μm. In the process of spraying, internal stress is generated, and the magnetic properties of the nanocrystalline strip are very sensitive to stress. At the same time, the strip is in an amorphous state structure. In order to eliminate the internal stress of the strip, reduce the coercive force and restore the magnetic properties , and to obtain a dual-phase structure of amorphous and nanocrystalline, crystallization heat treatment must be carried out. In order to obtain transverse magnetic permeability and low Br, the nanocrystalline alloy core must undergo transverse ...

AI Technical Summary

Problems solved by technology

In the mass production process, due to the influence of heating rate, temperature and cooling differences, and differences in the distribution of magnetic field uniformity, the size, number, and distribution of nanocrystalline grains of the magnetic core will also vary during the magnetization process. It leads to differential distribution of magnetic properties, resulting in poor inductance of some 1KHz and 10KHz

[0004] If the 10KHz inductance of the nanocrystalline alloy core is lower than the required lower limit after transverse magnetic treatment and the ratio of 1KHz to 10KHz inductance is ≤ 1.2, it is judged to be a defective product and cannot be treated again by transverse magnetic treatment. The 10KHz inductance value of the magnetic treatment will remain unchanged or decrease, and there is no meaning of rework treatment

Therefore, relatively large economic losses will be caused for this part of scrap materials, and it is not conducive to environmental protection.

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