Preparation method of electromagnetic shielding piece used for wireless charging, and electromagnetic shielding piece

Abstract

The invention provides a preparation method of an electromagnetic shielding piece used for wireless charging, and an electromagnetic shielding piece obtained through the above method. The preparation method comprises following steps: a winding step of winding amorphous and nanocrystalline ribbons in a predetermined size as required; a heat treatment step of putting the wound amorphous and nanocrystalline ribbons in a heat treatment furnace for heat treatment, and adding a transverse magnetic field, adding a longitudinal magnetic field or no adding magnetic fields during the heat treatment process; and a graphical processing step of carrying out graphical processing on uncoated surfaces of the amorphous and nanocrystalline ribbons. By employing the graphical processing technology such as laser cutting and chemical etching technologies and the like for graphical processing, electromagnetic performances (magnetic permeability, loss and the like) of the electromagnetic shielding piece are controllable, the charging efficiency is optimized, and the electromagnetic shielding effect of the electromagnetic shielding piece is maximized.

Description

technical field [0001] The invention relates to the fields of magnetic materials, wireless charging, electromagnetic shielding and heat treatment technology, in particular to an electromagnetic shielding sheet for wireless charging and an electromagnetic shielding sheet obtained by the method. Background technique [0002] With the emergence and application of high-tech products, the electromagnetic radiation pollution it produces is the fourth largest environmental pollution after water pollution, air pollution and noise pollution. [0003] With the rapid development of science and technology and the wide application of electronic equipment, people's work and life are increasingly dependent on electronic equipment. We are used to charging with data cables, and we are often annoyed by too many cables and not long enough. It has also been imagined that one day all electronic devices do not need power cords, and can use wireless charging technology to charge freely anytime, a...

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Problems solved by technology

[0010] Although the above-mentioned patents have mentioned the method of reducing magnetic loss, the process method has great disadvantages, that is, the internal microstructure is uncontrollable, the consistency of performance indicators is poor, and the charging efficiency is low.

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