Heat treatment method for amorphous material or nanocrystalline material for magnetic shield sheet

Abstract

The invention provides a heat treatment method for an amorphous material or a nanocrystalline material for a magnetic shield sheet. The heat treatment method comprises the following steps: a winding step of winding the amorphous strip material or the nanocrystalline strip material into magnetic cores with the needed dimensions, and a heat treatment step of arranging the amorphous magnetic cores or the nanocrystalline magnetic cores in a heat treatment furnace according to a certain rule and carrying out heat treatment, wherein magnetic field treatment is carried out during the heat treatment process. The shield performance of the magnetic shield sheet can be improved by virtue of a magnetic field-applied heat treatment process. In addition, a saturation magnetostriction constant is lowered after the magnetic field-applied heat treatment, so that the influence of stress is reduced, the magnetic conductivity is increased, the loss is reduced, and the charging efficiency is increased.

Description

technical field [0001] The invention relates to the fields of magnetic materials, wireless charging, electromagnetic shielding and heat treatment technology, in particular to a heat treatment method for amorphous or nanocrystalline materials used in magnetic shielding sheets. Background technique [0002] Wireless charging technology refers to charging using the principle of electromagnetic wave induction, which is similar to a transformer. At present, wireless charging technology has been used and promoted on a large scale in electronic devices such as portable terminals, mobile phones, and digital cameras. This technology has a coil at the sending end and a coil at the receiving end. The coil at the sending end is connected to a wired power source to generate an electromagnetic signal, and the coil at the receiving end induces the electromagnetic signal at the sending end to generate current for charging the battery. The coil at the receiving end needs to be electromagne...

AI Technical Summary

Problems solved by technology

This heat treatment cannot fully exert the electromagnetic properties that amorphous and nanocrystalline materials should have.

Although amorphous materials can obtain magnetic properties through this heat treatment method, the magnetic permeability is not high above 100KHZ frequency, and the hysteresis expansion coefficient (λ) has not yet reached the optimum. Under the action of stress, the magnetic permeability of the material decreases, and the performance There are obvious changes

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