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Method for improving electromagnetic shielding performance of Mg-Zn-Zr alloy by adding Y

A technology of electromagnetic shielding and magnesium alloy, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problem of little electromagnetic shielding performance

Active Publication Date: 2015-02-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on the properties of Mg-Zn-Zr magnesium alloys by adding rare earth elements mainly focuses on the mechanical properties and damping properties, and the electromagnetic shielding properties are rarely involved.

Method used

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  • Method for improving electromagnetic shielding performance of Mg-Zn-Zr alloy by adding Y
  • Method for improving electromagnetic shielding performance of Mg-Zn-Zr alloy by adding Y
  • Method for improving electromagnetic shielding performance of Mg-Zn-Zr alloy by adding Y

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: The Mg-Zn-Zr magnesium alloy containing Y in this example includes the following components by weight percentage: Zn 5.18%, Zr 0.98%, Y 1.29%, the balance is Mg, and the Zn / Y ratio in the alloy is 4.02 .

[0022] By above-mentioned proportioning and smelting in the following manner, the magnesium alloy of the present embodiment can be obtained:

[0023] a) Melting ingot making: under the protection of flux, put Mg ingot into the crucible and heat up to 740°C (or 750°C, 760°C) after melting, add pure Zn ingot according to the composition ratio of Example 1, Mg-30 %Y, Mg-27.85%Zr master alloy; adding method: preheat pure Zn ingot, Mg-30%Y, Mg-27.85%Zr master alloy at 170°C (or 140°C, 210°C) for 25 minutes, and quickly It is pressed into the liquid surface and stirred after melting. When the temperature of the melt rises to 750°C, refining starts for 5 to 10 minutes. The stirred alloy melt is left at 730°C (or 750°C) for 10 minutes. After standing, salvage the ...

Embodiment 2

[0024] Embodiment 2: The Mg-Zn-Zr magnesium alloy containing Y in this embodiment includes the following components by weight percentage: Zn 5.35%, Zr 1.00%, Y 3.91%, the balance is Mg, and the Zn / Y ratio in the alloy is 1.36 .

[0025] The smelting method for obtaining the magnesium alloy of this embodiment is the same as that of Example 1, except that the composition ratio of the smelted alloy is different.

Embodiment 3

[0026] Embodiment 3: The composition ratio of the Mg-Zn-Zr magnesium alloy containing Y in this embodiment is the same as in Embodiment 1, and the Zn / Y ratio is the same. The difference is that the alloy of this embodiment is a part of the alloy in Embodiment 1 The alloy is obtained by the following treatment:

[0027] b) Homogenization: Homogenize a part of the ingot in Example 1 at a temperature of 390° C. (or 400° C.) for a holding time of 20 h;

[0028] c) Hot extrusion: preheat the homogenized ingot at 390°C for 2 hours before extrusion, the extrusion temperature is 390°C, and the extrusion ratio is 11.5:1.

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Abstract

The invention discloses a method for improving electromagnetic shielding performance of Mg-Zn-Zr alloy by adding Y. The method is used for realizing the improvement of electromagnetic shielding performance by adding a rare element Y in the Mg-Zn-Zr alloy and comprises the following concrete steps of: smelting, preparing an ingot, homogenizing, hot-extruding, and the like. Due to addition of the Y, the phase composition in the alloy is changed along with the change of Zn / Y. The maximum value of the electromagnetic shielding performance SE of the homogenized and extruded alloy within a test frequency of 30MHz to 1.5GHz is 100dB. Compared with alloy without the rare element Y, the Mg-Zn-Zr alloy has the advantages that the electromagnetic shielding performance is improved by more than 20dB, the electromagnetic shielding performance of the Mg-Zn-Zr alloy is obviously improved, and the application range of Mg-Zn-Zr alloy in the fields of industry, electronics, aviation and military industry and the like is widened.

Description

technical field [0001] The invention relates to a method for adding Y to improve the electromagnetic shielding performance of a Mg-Zn-Zr magnesium alloy, which belongs to the field of metal materials and metallurgy. Background technique [0002] According to statistics, the electromagnetic energy radiated by electromagnetic waves to the outside world is increasing at a rate of 7% to 14% per year, which seriously increases the burden on the electromagnetic environment, and at the same time affects the stability of the operation of electronic and electrical equipment, and the security of national political, economic, and military information maintenance. The long-term maintenance of human health poses a serious challenge. Therefore, effectively controlling electromagnetic pollution is an urgent problem that countries all over the world need to solve. To this end, various countries have formulated and promulgated corresponding electromagnetic radiation protection standards and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C23/06H05K9/00
Inventor 陈先华潘复生刘娟
Owner CHONGQING UNIV