Cu-containing high-conductivity and high-electromagnetic-shielding-property wrought magnesium alloy and preparation method thereof

A deformation magnesium alloy, electromagnetic shielding technology, applied in the field of magnesium alloys, to achieve the effect of increased electrical conductivity, excellent electrical conductivity, good electromagnetic shielding performance

Active Publication Date: 2014-06-11
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

[0006] For the deficiencies of existing electromagnetic shielding materials, the purpose of the invention is to provide

Method used

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  • Cu-containing high-conductivity and high-electromagnetic-shielding-property wrought magnesium alloy and preparation method thereof
  • Cu-containing high-conductivity and high-electromagnetic-shielding-property wrought magnesium alloy and preparation method thereof
  • Cu-containing high-conductivity and high-electromagnetic-shielding-property wrought magnesium alloy and preparation method thereof

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preparation example Construction

[0038] A method for preparing a Cu-containing deformed magnesium alloy with high electrical conductivity and high electromagnetic shielding performance, the method comprises the steps of:

[0039] a) Melting ingot: in SF 6 +CO 2 Under the protection of gas, put the Mg ingot into the crucible and heat up to 740~760°C after melting, then add pure Zn ingot, Mg-30%Cu, Mg-28.54%Zr master alloy according to the ratio of the above-mentioned magnesium alloy composition; add The method is: preheat the pure Zn ingot, Mg-30%Cu, Mg-28.54%Zr master alloy at 140~220°C for 15~30 minutes, quickly press it into the molten Mg ingot below the liquid level, and after melting Stir, and start refining for 5-10 minutes when the temperature of the melt rises to 750°C. The stirred alloy melt is left to stand at 730-750°C for 10-30 minutes. Casting is carried out in an iron mold, and the casting temperature is 710~730°C;

[0040] b) Homogenization: surface turning the ingot obtained in step a) to re...

Embodiment 1

[0042] Embodiment 1: the Mg-Zn-Zr magnesium alloy containing Cu of the present embodiment, its composition is by weight percentage:

[0043] Zn: 4.96 wt.%;

[0044] Zr: 0.71 wt.%;

[0045] Cu: 0.37 wt.%

[0046] The balance is Mg and unavoidable impurities, the total amount of which is less than 0.06 wt.%.

[0047] According to above-mentioned proportioning and following preparation method, just can obtain the magnesium alloy of the present embodiment:

[0048] a) Smelting ingot: in SF 6 +CO 2Under gas protection, put the Mg ingot into the crucible and heat up to 740°C (or 750°C, 760°C) after melting, and add pure Zn ingot according to the composition ratio of Example 1, Mg-30%Cu, Mg-28.54% Zr master alloy; adding method: preheat the pure Zn ingot, Mg-30%Cu, Mg-28.54%Zr master alloy at 170°C (or 140°C, 210°C) for 25 minutes, and quickly press it into the Mg ingot to melt Below the liquid level after melting, stir after melting, start refining for 5-10 minutes when the me...

Embodiment 2

[0051] Embodiment 2: the Mg-Zn-Zr magnesium alloy containing Cu of the present embodiment, its composition is by weight percentage:

[0052] Zn: 5.01 wt.%,

[0053] Zr: 0.78 wt.%;

[0054] Cu: 0.82 wt.%;

[0055] %。 The balance is Mg and unavoidable impurities, the total amount of impurities is less than 0.06 wt.%.

[0056] The method of smelting ingot-homogenization-hot extrusion to obtain the magnesium alloy of this example is the same as that of Example 1, except that the composition ratio of the smelting alloy is different.

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Abstract

The invention discloses a Cu-containing high-conductivity and high-electromagnetic-shielding-property wrought magnesium alloy which comprises the following components in percentage by weight: 4.90-5.20% of Zn, 0.50-0.80% of Zr, 0.37-2.32% of Cu and the balance of Mg and unavoidable impurities. The preparation method comprises the steps of ingot smelting, homogenization, hot extrusion and the like, because the alloy contains Cu, and Cu, Mg and Zn are combined so as to generate a MgZnCu ternary phase, Zn solute atoms in a matrix are greatly reduced, the lattice distortion of the matrix decreases, and electron scattering is inhibited. Therefore, the alloy subjected to homogenization and extrusion has good conductivity, the electromagnetic shielding property of the alloy is markedly improved, and compared with alloys without containing Cu, the alloy has the advantages that the electromagnetic shielding effectiveness is increased by over 17db. The application scope of high-conductivity, high-electromagnetic-shielding-property and light-weight alloy materials in the fields of aerospace, military industry, microelectronics, and the like is effectively broadened.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a deformed magnesium alloy containing Cu with high electrical conductivity and high electromagnetic shielding performance and a preparation method thereof. [0002] Background technique [0003] Electromagnetic radiation, also known as electronic smog, is composed of electric energy and magnetic energy transferred together in space, and the energy is generated by the movement of electric charges. In recent years, besides noise pollution, water pollution, air pollution, and solid waste pollution, electromagnetic radiation has become the fifth largest pollution. In commercial scientific electronic instruments, telecommunication systems, and military electronic instruments, how to shield electromagnetic radiation is a major problem, which seriously perplexes many contemporary researchers. Because it is invisible, intangible, and acts directly on objects, it is a serious "invisible killer". El...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 陈先华潘复生刘莉滋
Owner CHONGQING UNIV
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