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A layered metal composite material for electromagnetic shielding

A composite material and layered metal technology, applied in the fields of magnetic/electric field shielding, metal layered products, lamination, etc., can solve the problems of environmental pollution, poor secondary processing performance, easy peeling, etc., and achieve simple heat treatment process, layered The effect of strong bonding force and simple processing method

Active Publication Date: 2020-05-26
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems in the preparation of layered composite materials by these methods are: (1) the interlayer bonding force of the prepared material is low, easy to peel off, and the secondary processing performance is poor; (2) the inorganic solvents and Organic solvents cause great pollution to the environment and destroy the ecological environment
(3) At present, most layered composite materials for electromagnetic shielding often have strong electrical conductivity, and these reflected electromagnetic waves often cause secondary pollution, which will have adverse effects on people and machine operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The soft magnetic alloy component layer is permalloy 1J50 with medium nickel and high saturation magnetic induction intensity, and the conductive component layer is metallic copper. The 1J50 strip with a thickness of 5.25mm and the copper strip with a thickness of 1.75mm are ground and rolled into a 2.0mm thick composite strip by solid phase compounding, and the composite strip is rolled to 0.2mm after diffusion annealing at 950°C , and then use tension leveling and stress relief annealing to make the composite strip have good flatness. At this time, the thickness of the highly conductive metal component layer in the finished strip is 0.05 mm, and the thickness of the high saturation magnetic induction soft magnetic alloy component layer is 0.15 mm. After the composite strip was kept at 950°C for 3 hours, its shielding effectiveness at 40GHz and 0.15Oe was tested to be 60dB.

Embodiment 2

[0020] Embodiment 2: The soft magnetic alloy component layer is permalloy 1J85 with high magnetic permeability, and the conductive component layer is metallic copper. The 1J85 alloy strip with a thickness of 4.5mm and the copper strip with a thickness of 2.5mm are ground and rolled into a 2.0mm thick composite strip by solid phase compounding, and the composite strip is rolled to 0.5 mm, and then use tension leveling and stress relief annealing to make the composite strip have good flatness. At this time, the thickness of the highly conductive metal component layer in the finished strip is 0.18 mm, and the thickness of the high magnetic permeability soft magnetic alloy component layer is 0.32 mm. After the composite strip was kept at 950°C for 3 hours, its shielding effectiveness at 10KHz and 0.5Oe was tested to be 40dB.

Embodiment 3

[0021] Embodiment 3: The soft magnetic alloy component layer is permalloy 1J85 with high magnetic permeability, and the conductive component layer is metallic copper. 1J85 alloy strips and copper strips with a thickness of 3.5mm are ground and rolled into 2.0mm thick composite strips by solid phase compounding, and the composite strips are rolled to 0.1mm after diffusion annealing at 950°C, and then The composite strip has good flatness by adopting tension leveling and stress relief annealing. At this time, the thickness of the highly conductive metal component layer in the finished strip is 0.05 mm, and the thickness of the high magnetic permeability soft magnetic alloy component layer is 0.05 mm. After the composite strip was kept at 950°C for 3 hours, its shielding effectiveness at 40GHz and 0.1Oe was tested to be 80dB.

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Abstract

A layered metal composite material for electromagnetic shielding belongs to that technical field of electromagnetic shielding materials. The layered structure consists of two layers, including a layerof high conductivity metal and a layer of high permeability or high magnetic induction strength soft magnetic alloy. Among them, the thickness of high conductivity metal component layer is 0.05-0.2 mm, high permeability or high saturation magnetic induction strength is 0.05-0.3mm. The invention has the advantages that the layered metal composite material has good shielding effect under low-frequency and high-frequency electromagnetic environment. The processing method is simple, the harm to the surrounding environment and operators is small, the obtained layered structure has strong adhesionbetween layers, and the heat treatment process is simple, the cost is low, and it is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, in particular to a layered metal composite material for electromagnetic shielding. Background technique [0002] With the rapid development of electronic technology, the frequency resources of electromagnetic waves developed and utilized by people are getting wider and wider. The application frequency range of electronic equipment such as mobile phones, induction cookers, Internet TV, broadband Internet access, and household appliances covers from extremely low frequency, radio frequency to microwave frequency. However, while electromagnetic technology provides convenience to human life, it also brings us some unfavorable factors. For example, electromagnetic interference caused by electromagnetic wave radiation will not only affect the normal operation of various electronic devices, but also be harmful to human health. At present, electromagnetic wave leakage has bee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00B32B15/20B32B15/01B32B38/00B32B37/10
CPCB32B15/015B32B15/20B32B37/10B32B38/0036B32B2038/0048B32B2307/212H05K9/0088
Inventor 徐明舟杨帆李西铭张乐
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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