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Preparation method and application of metal fiber shielding felt

A metal fiber and fiber technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of full frequency shielding difficulty, high conductivity lacks high magnetic conductivity, high magnetic permeability lacks high conductivity, etc., and achieves good Shielding effect, wide application range, good reflective effect

Inactive Publication Date: 2014-05-21
天津华磊科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, no shielding materials produced at home and abroad can achieve the shielding effect of the whole frequency band. There are shielding materials for partial frequency bands, but they all belong to the plate type. However, these materials have high conductivity and lack high magnetic permeability. They have high magnetic permeability. The lack of high conductivity, so it is extremely difficult to achieve full-band shielding with conventional plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of metal fiber shielding felt, the steps are as follows:

[0023] (1) Copper plating on the surface: take the purchased 0.4mm permalloy wire and plate copper on the copper plating machine; the thickness of the copper layer is 0.02mm;

[0024] (2) Drawing: Take a plurality of copper-plated Permalloy wires obtained in step (1), put them into a copper tube, and draw them with a wire drawing machine for many times, with a pulling force of 4T, and drawing to 5mm per 10,000 wires , to get Permalloy fiber;

[0025] (3) Copper removal: Soak the Permalloy fiber in a nitric acid solution with a mass concentration of 18-22% to remove copper, and the soaking time of the Permalloy fiber is 10 minutes;

[0026] (4) Water washing: Soak the copper-removed Permalloy fibers obtained in step (3) in hydrogen peroxide for 10 minutes, wash with water 3 times, and combine the obtained wastewater; neutralize the soaked wastewater with industrial alkali until the pH is 6~7...

Embodiment 2

[0035] A preparation method of metal fiber shielding felt, the steps are as follows:

[0036] (1) Copper plating on the surface: take the purchased 0.6mm permalloy wire and plate copper on the copper plating machine; the thickness of the copper layer is 0.03mm;

[0037] (2) Drawing: Take a plurality of copper-plated Permalloy wires obtained in step (1), put them into a copper tube, and draw them with a wire drawing machine for many times, with a pulling force of 6T, and drawing to 7mm per 10,000 wires , to get Permalloy fiber;

[0038] (3) Copper removal: Soak the Permalloy fiber in a nitric acid solution with a mass concentration of 18-22% to remove copper, and the soaking time of the Permalloy fiber is 20 minutes;

[0039] (4) Water washing: Soak the copper-removed Permalloy fibers obtained in step (3) in hydrogen peroxide for 20 minutes, wash them with water 4 times, and combine the obtained wastewater; neutralize the soaked wastewater with industrial alkali until the pH i...

Embodiment 3

[0048] The shielding performance of the metal fiber shielding felt prepared in Example 2 was tested in an electromagnetic shielding laboratory, and the test temperature was 20°C. The test instrument is HP8563E spectrum analyzer: ZN1180L, ZN1180D signal source and series antenna.

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PUM

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Abstract

The invention relates to a preparation method and application of a metal fiber shielding felt, and in particular relates to a metal fiber shielding felt capable of playing a good attenuation offset role on foreign electromagnetic wave, belonging to the technical field of shielding materials. The metal fiber shielding felt is prepared by comprising the steps of conducting surfaces copper plating, drawing, copper removal, rinsing, stretch-breaking, net forming, sintering, cooling and postprocessing on purchased permalloy wires, thus obtaining the metal fiber shielding felt product. The metal fiber shielding felt is wide in range of application, including shielding of small electronic devices to shielding rooms, shielding canopies, shielding communication cables, transformation rooms, shielding boxes and cabinets. The obtained product is thin, soft, good in reflection property, and good in vortex, and plays a good attenuation offset role on foreign electromagnetic wave, thus being capable of achieving a good shielding effect.

Description

technical field [0001] The invention relates to a preparation method and application of a metal fiber shielding felt, mainly relates to a metal fiber shielding felt capable of effectively offsetting and attenuating external electromagnetic waves, and belongs to the technical field of shielding materials. Background technique [0002] At present, the commonly used electromagnetic shielding materials are mainly metal materials, such as aluminum, copper, zinc, iron, steel, nickel and their alloys. Different metal materials are selected, and their parameters such as magnetic permeability are also different. When shielding low-frequency magnetic fields, high magnetic permeability such as 80% nickel alloy Mumetal is often used, which is a high magnetic permeability iron-nickel alloy shielding materials, these alloys are suitable for applications where it is necessary to reduce the source of electromagnetic interference in a very small space. Shielding materials should be selected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00H05K9/00
Inventor 何玉忠
Owner 天津华磊科技发展有限公司
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