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Ultrathin magnetic field shielding sheet excellent in heat dissipation performance and preparation method of ultrathin magnetic field shielding sheet excellent in heat dissipation performance

A technology of heat dissipation performance and shielding sheet, which is applied in the fields of magnetic field/electric field shielding, cooling/ventilation/heating transformation, electrical components, etc. It can solve the problems that the thickness and heat dissipation performance cannot meet the growing requirements of customers, and achieve optimal heat dissipation effect. Good magnetic field shielding performance and guaranteed mechanical strength

Inactive Publication Date: 2018-06-29
SHENZHEN YN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional magnetic isolation materials can no longer meet the growing requirements of customers in terms of thickness and heat dissipation performance

Method used

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  • Ultrathin magnetic field shielding sheet excellent in heat dissipation performance and preparation method of ultrathin magnetic field shielding sheet excellent in heat dissipation performance
  • Ultrathin magnetic field shielding sheet excellent in heat dissipation performance and preparation method of ultrathin magnetic field shielding sheet excellent in heat dissipation performance
  • Ultrathin magnetic field shielding sheet excellent in heat dissipation performance and preparation method of ultrathin magnetic field shielding sheet excellent in heat dissipation performance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of an ultra-thin magnetic field shielding sheet with excellent heat dissipation performance in this embodiment, the specific preparation steps are as follows:

[0035] (1) The amorphous and nanocrystalline strips (composed of Fe 75-90wt.%, Si 5-10wt.%, B 1-10wt.%, Cu 1-5wt.%, Nb 3-10wt.%, other 0-5wt.%) at 560° C. for 30 minutes to obtain nanocrystalline strips with a thickness of 18 μm.

[0036] (2) On one side of the nanocrystalline strip obtained in step (1), use a thermally conductive double-sided adhesive with a thickness of 3 μm (composed of adding ceramic powder, aluminum oxide and other thermally conductive fillers to ordinary PET double-sided adhesive) for compounding treatment.

[0037] (3) The nanocrystalline strip after the regluing treatment obtained in step (2) is subjected to crushing treatment, and the crushing process is completed by dislocation rolling of the upper and lower flower rollers: through a group of patterned steel bars...

Embodiment 2

[0045] The preparation method of an ultra-thin magnetic field shielding sheet with excellent heat dissipation performance in this embodiment, the specific preparation steps are as follows:

[0046] (1) The amorphous and nanocrystalline strips (composed of Fe 75-90wt.%, Si 5-10wt.%, B 1-10wt.%, Cu 1-5wt.%, Nb 3-10wt.%, other 0-5wt.%) at 650° C. for 100 minutes to obtain nanocrystalline strips with a thickness of 20 μm.

[0047] (2) On one side of the nanocrystalline strip obtained in step (1), use a thermally conductive double-sided adhesive with a thickness of 5 μm (composed of adding ceramic powder, aluminum oxide and other thermally conductive fillers to ordinary PET double-sided adhesive) for compounding treatment.

[0048] (3) The nanocrystalline strip after the regluing treatment obtained in step (2) is subjected to crushing treatment, and the crushing process is completed by dislocation rolling of the upper and lower flower rollers: through a group of patterned steel bar...

Embodiment 3

[0056] The preparation method of an ultra-thin magnetic field shielding sheet with excellent heat dissipation performance in this embodiment, the specific preparation steps are as follows:

[0057] (1) The amorphous and nanocrystalline strips (composed of Fe 75-90wt.%, Si 5-10wt.%, B 1-10wt.%, Cu 1-5wt.%, Nb 3-10wt.%, other 0-5wt.%) at 580° C. for 60 minutes to obtain a nanocrystalline ribbon with a thickness of 22 μm.

[0058] (2) On one side of the nanocrystalline strip obtained in step (1), use a thermally conductive double-sided adhesive with a thickness of 5 μm (composed of adding ceramic powder, aluminum oxide and other thermally conductive fillers to ordinary PET double-sided adhesive) for compounding treatment.

[0059] (3) The nanocrystalline strip after the regluing treatment obtained in step (2) is crushed, and the crushing process is completed by dislocation rolling of the upper and lower flower rollers: through a group of two mirror steel rods up and down, the low...

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Abstract

The invention belongs to the field of electronic materials and discloses an ultrathin magnetic field shielding sheet excellent in heat dissipation performance and a preparation method of the ultrathinmagnetic field shielding sheet excellent in heat dissipation performance. The method includes: subjecting an amorphous-nanocrystalline strip to heat treatment at 550-650 DEG C to obtain a nanocrystalline strip in thickness of 7-22micron; using a heat-conducting double-sided adhesive tape in thickness of 3-5micron for adhesive lamination treatment of one or both faces of the nanocrystalline strip;fragmenting the nanocrystalline strip into discontinuous single parts at intervals of 0.1-5micron; finally laminating the multilayer fragmented nanocrystalline strip to obtain the ultrathin magneticfield shielding sheet excellent in heat dissipation performance. According to the method, the nanocrystalline strip can be thinned to 7-22micron from 25micron, and metal foils or graphite flaks are further adopted for edge covering treatment, so that thickness of the magnetic field shielding sheet is greatly reduced while the heat dissipation performance is improved.

Description

technical field [0001] The invention belongs to the field of electronic materials, and in particular relates to an ultra-thin magnetic field shielding sheet with excellent heat dissipation performance and a preparation method thereof. Background technique [0002] The wireless charging module is composed of two parts: the transmitting end and the receiving end. Both the transmitting end and the receiving end will use coils (wire wound coils or flexible circuit board coils) and magnetic isolation materials. Among them, the magnetic isolation material is used to isolate the interference of the wireless charging module to the outside world, and reduce the interference of the electromagnetic field of wireless charging to other metal parts. At the same time, the magnetic isolation material can improve the charging efficiency of the wireless charging module due to its excellent magnetic properties, and reduce problems such as eddy current loss and heat caused by external interfere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H02J50/70H05K7/20
Inventor 曾志超鲁晓燕田忆兰刘仲武
Owner SHENZHEN YN TECH CO LTD
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