Modified nanocrystalline strip, preparation method and application thereof

Abstract

The invention provides a modified nanocrystalline strip, a preparation method and application thereof. The preparation method comprises the following steps of: conducting rolling treatment on a nanocrystalline strip with double faced adhesive tape attached to one face to obtain a micro-fragmented nanocrystalline strip; carrying out acid etching surface treatment on the obtained micro-fragmented nanocrystalline strip; carrying out alkali washing surface treatment on the nanocrystalline strip subjected to acid etching surface treatment; sequentially carrying out water washing and alcohol washing on the nanocrystalline strip obtained by the alkali washing surface treatment, and then performing drying; and subjecting the dried nanocrystalline strip to micro-oxidation treatment to obtain the modified nanocrystalline strip. The obtained modified nanocrystalline strip has a lower magnetic conductivity imaginary part and lower loss, is more favorable for a wireless charging system to acquire high electric energy transmission efficiency, and can enable the wireless charging system to have better electric energy transmission efficiency when being applied to a nanocrystalline composite structure magnetic sheet.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a wireless charging material and its preparation method and application, in particular to a modified nanocrystalline strip material and its preparation method and application. Background technique [0002] In recent years, wireless charging technology has gradually become the standard configuration of smartphones. The mobile phone wireless charging receiver is mainly composed of two parts: a coil and a magnetic sheet. Among them, the coil mainly generates the excitation magnetic field at the receiving and transmitting end, and then converts it into an alternating current; the magnetic sheet mainly plays the role of magnetic isolation and magnetic conduction, thereby improving the charging efficiency of the entire system and avoiding magnetic field leakage. At present, the wireless charging of mobile phones mainly adopts the Qi standard, and the operating frequency is 100-200kHz....

AI Technical Summary

Problems solved by technology

[0006] The composite magnetic sheet structure composed of nanocrystalline ribbons has been widely used in wireless charging systems for mobile phones, but there are still some problems or room for optimization: the microstructure of the nanocrystalline ribbons treated with microfractionation is not uniform enough, and the shape of the fragmented units is not uniform enough. And the size is uneven, and the insulation uniformity between each fragmentation unit is also poor, which leads to the concentration of the magnetic field at the sharp corner and the contact position of each fragmentation unit, the distribution of the magnetic field is uneven, and even serious local heating occurs; nanometer Crystalline materials have good electrical conductivity. Even after micro-fractionation, the eddy current loss of the magnetic sheet is relatively serious, which greatly limits the further improvement of the efficiency of the entire system.

If the nanocrystalline ribbon is excessively finely divided, the fragmentation unit can be made smaller, which can effectively reduce the influence of the eddy current effect, but at the same time, the magnetic permeability will drop significantly, and the magnetic shielding and magnetic permeability effects will deteriorate; because the nanocrystalline ribbon is affected by its own Due to the limitations of the material, its frequency characteristics are not particularly excellent, especially the loss characteristics at high frequencies, which is specifically reflected in the high imaginary part of the magnetic permeability of the nanocrystalline ribbon, which in turn affects the efficiency of the entire wireless charging system; nanocrystalline At present, most of the composite magnetic sheets are made of nanocrystalline ribbons with the same performance and specifications, and there is still room for further optimization in structure.

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