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High-conductivity and high-shielding-effectiveness magnesium alloy and preparation method thereof

A technology with shielding efficiency and high electrical conductivity, applied in the field of shielding materials and metal materials, can solve the problems of low strength, electromagnetic shielding performance is not as good as metal, etc., achieve high electromagnetic shielding performance, excellent plastic processing performance, improve strength and room temperature extension. rate effect

Active Publication Date: 2015-03-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these materials are lightweight and corrosion-resistant, their electromagnetic shielding performance is generally inferior to that of metals, and their strength is low, making them unsuitable for structural materials

Method used

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Examples

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preparation example Construction

[0028] The method for preparing the above-mentioned magnesium alloy with high electrical conductivity and high shielding effectiveness of the present invention comprises the following steps:

[0029] 1) Melting and casting ingots: Weigh each raw material according to the composition requirements, among which manganese is a magnesium-manganese master alloy, and zirconium is a magnesium-zirconium master alloy. 99% CO by volume 2 and 1% SF 6 Under the protective gas formed, the magnesium is first smelted between 720°C and 740°C. After it is completely melted and the temperature rises to 740°C and stabilizes, then the magnesium-manganese and magnesium-zirconium master alloys preheated to about 200°C are added to make the magnesium-manganese and the magnesium-zirconium master alloy are melted and fully stirred for 3-6 minutes, and the melt is left to stand at 740°C for 10-20 minutes, and the surface scum is removed, and it is poured at 740°C until it is preheated to 250-350°C. In...

Embodiment 1

[0037] A method for preparing a novel magnesium alloy with high electrical conductivity and high shielding performance, comprising the steps of:

[0038] 1. Ingredients: 5wt.% magnesium-manganese, 30wt.% magnesium-zirconium master alloy and pure magnesium 99.98wt.%Mg are used as raw materials. According to the embodiment, the formula is 0.5wt.% Mn, 0.1wt.% Zr, and the balance is industrial For pure magnesium Mg, calculate and weigh three raw materials.

[0039] 2. Smelting: Under the cover of 99%CO2+1%SF6 (volume percentage) gas, first smelt industrial pure magnesium at 720℃~740℃. Heat the magnesium-manganese and magnesium-zirconium master alloys to 200°C, and stir them fully for 3-6 minutes, then let the melt stand at 740°C for 10-20 minutes, and pour it at 740°C until it is preheated to 250-350°C In the iron mold, a magnesium alloy ingot is prepared.

[0040] 3. Homogenization treatment: Cover the prepared magnesium alloy ingot with graphite, homogenize it at 480° C. for 2...

Embodiment 2

[0045] A method for preparing a novel magnesium alloy with high electrical conductivity and high shielding performance, comprising the steps of:

[0046] 1. Ingredients: 5wt.% magnesium-manganese, 30wt.% magnesium-zirconium master alloy and industrial pure magnesium 99.98wt.%Mg are used as raw materials. According to the embodiment, the formula is 1wt.% Mn and 0.1wt.% Zr. Magnesium Mg, calculate and weigh the three raw materials.

[0047] 2. Smelting: Under the cover of 99%CO2+1%SF6 (volume percentage) gas, first smelt industrial pure magnesium at 720℃~740℃. Heat the magnesium-manganese and magnesium-zirconium master alloys to 200°C, and stir them fully for 3-6 minutes, then let the melt stand at 740°C for 10-20 minutes, and pour it at 740°C until it is preheated to 250-350°C In the iron mold, a magnesium alloy ingot is prepared.

[0048] 3. Homogenization treatment: cover the prepared magnesium alloy ingot with graphite, homogenize it at 500° C. for 20 hours, and then water...

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Abstract

The invention provides high-conductivity and high-shielding-effectiveness magnesium alloy and a preparation method thereof, and belongs to the field of design of materials. The high-conductivity and high-shielding-effectiveness magnesium alloy is prepared from the following raw material components in percentage by mass: 0.5wt% to 3wt% of manganese, 0.1wt% to 0.5wt% of zirconium and the balance of pure magnesium and inevitable impurities. The preparation method comprises the following steps: firstly melting magnesium; adding magnesium-manganese intermediate alloy and magnesium-zirconium intermediate alloy; stirring, standing and then casting into a cast ingot; subsequently thermally homogenizing the cast ingot and rolling to obtain a corresponding plate. According to the preparation method disclosed by the invention, low-content magnesium-manganese intermediate alloy and magnesium-zirconium intermediate alloy are used for preparing novel high-conductivity and high-shielding-effectiveness wrought magnesium alloy; in comparison with an existing widely-used shielding material, the shielding material is low in cost, high in specific strength, higher than a traditional metal shielding material and a composite shielding material in specific shielding effectiveness, excellent in molding processability and applicable to the field of weight-sensitive electromagnetic protection.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a novel magnesium alloy with high electrical conductivity and high shielding efficiency and a preparation method thereof, belonging to the field of shielding materials and metal materials. [0002] Background technique [0003] At present, electronic devices are flooding people's lives, and the instability of equipment caused by electromagnetic signal mutual interference (EMI) is becoming more and more serious, which is especially important for medical, communication, military, aerospace and other fields. In addition, electromagnetic pollution has become the fourth largest pollution source after water pollution, air pollution, and noise pollution. Relevant studies have shown that prolonged exposure to electromagnetic radiation will have adverse effects on human tissues and lead to various diseases. Therefore, electromagnetic protection (or electromagnetic shielding) has increasingly highligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 潘复生宋锴陈先华汤爱涛喻正文佘加徐笑阳
Owner CHONGQING UNIV
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