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High thermal conductivity magnesium alloy and preparation method thereof

A magnesium alloy, high thermal conductivity technology, applied in the field of metal material magnesium alloy, can solve the problems of inability to meet mechanical properties, decreased thermal conductivity, low thermal conductivity, etc., and achieves improved mechanical properties and thermal conductivity. Effect

Active Publication Date: 2018-01-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At room temperature, the thermal conductivity of pure magnesium is 155W·(m·K) -1 , but the strength is low, only about 90MPa, which cannot meet the requirements of mechanical properties
After adding alloy elements to improve the strength of the alloy, its thermal conductivity decreases significantly. At present, except for some magnesium alloys with precious rare earth or silver added, the thermal conductivity is generally lower than 100W (m K) -1

Method used

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  • High thermal conductivity magnesium alloy and preparation method thereof
  • High thermal conductivity magnesium alloy and preparation method thereof
  • High thermal conductivity magnesium alloy and preparation method thereof

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preparation example Construction

[0023] In the specific implementation process, the steps of the preparation method of the high thermal conductivity magnesium alloy of the present invention are as follows:

[0024] 1) Use pure magnesium ingots, pure zinc ingots, pure tin ingots, pure aluminum ingots and magnesium-manganese intermediate alloys as raw materials, make ingredients according to the alloy design component content, and put them in a drying oven to preheat to about 200°C.

[0025] 2) Mg is smelted in an iron crucible at a melting temperature of 730°C. After the pure magnesium is completely melted, the preheated pure metal Zn, Sn, Al and Mg-10wt.%Mn master alloy are added in turn for alloying, and the heat preservation is 15 ~20min, after all melting, remove the slag and blow into high-purity argon gas for refining for 3~5min, let it stand for 5~20min, adjust the temperature of the alloy melt to 700~720℃, and use metal molds or semi-continuous casting crystallizers to cast into Ingots for casting or d...

Embodiment 1

[0031] In this embodiment, the components and weight percentages of the high thermal conductivity magnesium alloy are: 4.0% Zn, 2.5% Sn, 1.0% Al, 0.5% Mn, the rest are Mg and unavoidable impurity elements, and the content of impurity elements is <0.05% .

[0032] In this embodiment, the preparation method of the high thermal conductivity magnesium alloy is as follows:

[0033] (1) Ingredients: The raw materials are metal Mg, metal Zn, metal Sn, metal Al and Mg-10wt.%Mn master alloy, and the components and weight percentages of the alloy are: 4.0% Zn, 2.5% Sn, 1.0% Al, 0.5% Mn, the rest is Mg;

[0034] (2) Melting: Using iron crucible, melting in a resistance furnace, controlling the melting temperature to 730°C, using CO 2 and SF 6 Mixed as protective gas (by volume percentage, 99% CO 2 +1%SF 6 ), the raw material is preheated at 200°C, firstly add metal Mg, after metal Mg is completely melted, add Mg-Mn intermediate alloy, smelt for 15 minutes, finally add metal Zn, Sn a...

Embodiment 2

[0038] In this embodiment, the components and weight percentages of the high thermal conductivity magnesium alloy are: 3.5% Zn, 2.0% Sn, 0.8% Al, 0.3% Mn, the rest are Mg and unavoidable impurity elements, and the content of impurity elements is <0.05% .

[0039] In this embodiment, the preparation method of the high thermal conductivity magnesium alloy is as follows:

[0040] (1) Ingredients: The raw materials are metal Mg, metal Zn, metal Sn, metal Al and Mg-10wt.%Mn master alloy, the components of the alloy and their weight percentages are: 3.5%Zn, 2.0%Sn, 0.8%Al, 0.3% Mn, the rest is Mg;

[0041] (2) Melting: Using iron crucible, melting in a resistance furnace, controlling the melting temperature to 730°C, using CO 2 and SF 6 Mixed as protective gas (by volume percentage, 99% CO 2 +1% SF 6 ), the raw material is preheated at 200°C, firstly add metal Mg, after metal Mg is completely melted, add Mg-Mn intermediate alloy, smelt for 15 minutes, finally add metal Zn, Sn a...

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Abstract

The invention belongs to the field of metal magnesium alloys and particularly relates to an Mg-Zn-Sn-Al-Mn high thermal conductivity magnesium alloy and a preparation method thereof. The magnesium alloy comprises 3-6wt% of Zn, 1-4wt% of Sn, 0.1-1.0wt% of Al, 0.1-0.5wt% of Mn and the balance of Mg and unavoidable impurities, wherein the content of the impurities is less than 0.05wt%. Mg is melt byan iron crucible. After all the pure Mg is melted, preheated pure metals Zn, Sn and Al and an Mg-10wt% Mn intermediate alloy are orderly added into the crucible and are alloyed and the alloy is castedthrough a metal mold or a semi-continuous casting crystallizer to form a cast ingot or a deformation ingot blank. The high thermal conductivity magnesium alloy cast ingot and deformed product have thermal conductivity of 120W. (m. K)<-1> or more at 25 DEG C, have alloy as-cast mechanical properties such as tensile strength greater than or equal to 200MPa, yield strength greater than or equal to 100MPa and elongation at break greater than or equal to 7% and deformation properties such as tensile strength greater than or equal to 250MPa, yield strength greater than or equal to 150MPa and elongation at break greater than or equal to 10% and meet the needs in the fields of national defense, electronics and communication.

Description

technical field [0001] The invention belongs to the field of metal material magnesium alloys, and in particular relates to a Mg-Zn-Sn-Al-Mn high thermal conductivity magnesium alloy and a preparation method thereof. Background technique [0002] Structural materials for heat dissipation systems of high-power LED equipment, large-scale communication base stations, power supplies, and electronic devices in aerospace require not only excellent thermal conductivity, but also low density and high strength. Therefore, it is extremely important to select structural materials with excellent thermal conductivity and mechanical properties. As the lightest metal structural material in practical application, magnesium alloy has the characteristics of high specific strength, high specific stiffness, and good thermal conductivity. At room temperature, the thermal conductivity of pure magnesium is 155W·(m·K) -1 , but the strength is low, only about 90MPa, which cannot meet the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/00C22C1/03C22F1/06
Inventor 罗天骄杨院生崔杰王聪朱绍珍
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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