Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof

A magnesium alloy, low-cost technology, applied in the field of metal materials and metal material processing, can solve the problems of reduced thermal conductivity, low cost density, and high alloy density, and achieve high thermal conductivity and strength, low alloy cost, and low alloy density. Effect

Active Publication Date: 2014-09-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the problems existing in the existing heat-conducting magnesium alloys, such as using a variety of rare earth elements or high-priced alloying elements that lead to high cost, or increasing the content of alloying elements in order to increase the strength, resulting in a sharp drop in thermal conductivity and high alloy density, the purpose of the present invention is to To provide a rare earth-free, low-cost, high-strength, thermally conductive magnesium alloy and a preparation method thereof, the magnesium alloy has relatively high thermal conductivity, strength and flame resistance, and is relatively low in cost and relatively low in density

Method used

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  • Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof
  • Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof
  • Rare-earth-free low-cost high-strength heat-conducting magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] The design selects the Mg-1.5Mn-0.5Al-1.0Ca (wt%) alloy composition ratio to form a magnesium alloy, and the preparation method of its rare earth-free low-cost high-strength heat-conducting magnesium alloy is as follows:

[0049] 1) With pure Mg ingot, pure Al ingot, pure Ca particles and Mg-5Mn master alloy (that is, the composition content of the master alloy is: 5wt% Mn, the rest is Mg) raw materials, according to the weight percentage of the above-mentioned magnesium alloy composition Ingredients;

[0050] 2) After the crucible is cleaned and preheated, put all the pure magnesium ingots and the Mg-5Mn master alloy into the crucible of the smelting furnace. 2 and SF 6 Heating under the protection of mixed protective gas, the heating rate is 20 ~ 40 ℃ / min, CO 2 and SF 6 The flow ratio is 50, and the temperature of the melt after complete melting is controlled at 710-760°C;

[0051] 3) Heat the pure Al ingot in a preheating furnace to 250-310°C, add the preheated...

Embodiment 2

[0055] The design selects Mg-0.8Mn-0.5Al-0.5Ca (wt%) chemical composition ratio to form a magnesium alloy, and the preparation method of its rare earth-free low-cost high-strength heat-conducting magnesium alloy material is as follows:

[0056] 1) With pure Mg ingot, pure Al ingot, Mg-30Ca and Mg-5Mn master alloy as raw material, carry out batching according to the weight percentage of above-mentioned magnesium alloy composition;

[0057] 2) After the crucible is cleaned and preheated, put all the pure magnesium ingots and the Mg-5Mn master alloy into the crucible of the smelting furnace. 2 and SF 6 Heating under the protection of mixed protective gas, the heating rate is 20 ~ 40 ℃ / min, CO 2 and SF 6 The flow ratio is 50, and the temperature of the melt after complete melting is controlled at 710-760°C;

[0058] 3) Put the pure Al ingot in the preheating furnace and heat it to 250-310°C, add the preheated Al ingot and the Mg-Ca master alloy into the magnesium melt success...

Embodiment 3

[0062] The design selects the Mg-1.5Mn-0.9Al-1.0Ca (wt%) alloy composition ratio to form a thermally conductive magnesium alloy, and the extrusion profile preparation method is as follows:

[0063] 1) Proportioning alloy raw materials and smelting and pouring into ingot according to the method described in embodiment 1;

[0064]2) Cut the heat-conducting magnesium alloy ingot prepared above directly into corresponding extrusion billets, and then directly adopt the extrusion process to deform the billets into forming materials after preheating at 350°C. The extrusion speed is 3m / min, and the extrusion ratio 25, the extruded material is cooled by air cooling, that is, a rare earth-free, low-cost, high-strength, heat-conducting magnesium alloy can be obtained.

[0065] The prepared rare earth-free low-cost high-strength thermally conductive magnesium alloy has a thermal conductivity of 129W / (m*K) at 20°C, a room temperature (25°C) tensile strength of 370MPa, a tensile yield stren...

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Abstract

The invention relates to a rare-earth-free low-cost high-strength heat-conducting magnesium alloy and a preparation method thereof. The magnesium alloy is composed of the following chemical components in percentage by weight: 0.5-2.0 wt% of Mn, 0.3-1.5 wt% of Ca, 0.3-1.0 wt% of Al, and the balance of Mg and inevitable impurities. The magnesium alloy solves the problem of overhigh cost due to use of multiple rare-earth elements or high-price alloy elements, and the problems of sharp drop of heat conductivity coefficient, overhigh density and the like due to higher alloy element content caused by strength increase in the existing heat-conducting magnesium alloy; and the magnesium alloy has the advantages of higher heat conductivity coefficient, higher strength, higher flame resistance, lower cost and lower density.

Description

technical field [0001] The invention relates to the field of metal materials and metal material processing, in particular to a rare-earth-free, low-cost, high-strength, heat-conducting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium is the lightest of commonly used metal structural materials, with a specific gravity of about 1.74g / cm 3 , is 1 / 4 of steel and 2 / 3 of aluminum. Magnesium and magnesium alloys have the three advantages of rich resources, energy saving, and environmental friendliness, and are lightweight structural materials and functional materials with high specific strength. They are recognized by the world as "the most promising new materials in the 21st century" ". [0003] The thermal conductivity of pure magnesium at room temperature is high, about 157W / m*K, but the strength is too low, and the tensile yield strength in the as-cast state is about 21MPa. After magnesium is alloyed, its strength is significantly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/02C22C1/03C22F1/06
Inventor 徐世伟唐伟能秦云蒋浩民张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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