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Sr-containing heat-resisting casting magnesium alloy

A technology for casting magnesium alloys and magnesium alloys, which is applied in the field of magnesium alloy materials, can solve problems such as high prices, and achieve the effects of low production costs, cost reduction, good room temperature and high temperature performance

Inactive Publication Date: 2012-04-11
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The recently published Mg-Sn-Si-La (publication number 101948975) heat-resistant magnesium alloy patent refines Mg by adding rare earth element La 2 Si phase, while generating a new intermetallic compound La 5 Si 4 Phase, although the heat resistance of the alloy is improved, but the rare earth element La is a strategic resource and the price is expensive (250 yuan / kg)

Method used

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  • Sr-containing heat-resisting casting magnesium alloy
  • Sr-containing heat-resisting casting magnesium alloy
  • Sr-containing heat-resisting casting magnesium alloy

Examples

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Effect test

Embodiment 1

[0040] Sr-containing heat-resistant cast magnesium alloy, the components and mass percentages are Sn: 3.5%, Si: 1%, Sr: 0.5%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest are Mg.

[0041] The preparation method is as follows:

[0042] (1) Ingredients: The raw materials are pure Mg with a purity of 99.9%, pure Sn with a purity of 99.9%, and Mg-30%Si and Mg-30%Sr master alloys, according to the mass percentage of elements Sn: 3.5%, Si: 1%, Sr: 0.5%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest is the proportion of Mg.

[0043] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N 2 and SF 6 Mixed gas as protective gas, by volume percentage, N 2 95%, SF 6 5%, first smelting metal Mg, after it is completely melted, add Mg-30%Si master alloy, pure Sn and Mg-30%Sr master alloy in sequence, and control the melting temperature to 700°C to obtain liquid metal.

[0044] (3) Casting: The molten metal is poured at 680...

Embodiment 2

[0049] Sr-containing heat-resistant cast magnesium alloy, the components and mass percentages are Sn: 4%, Si: 1%, Sr: 2%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest are Mg.

[0050] The preparation method is as follows:

[0051] (1) Ingredients: The raw materials are pure Mg with a purity of 99.9%, pure Sn with a purity of 99.9%, and Mg-30%Si and Mg-30%Sr master alloys, according to the mass percentage of elements Sn: 4%, Si: 1%, Sr: 2%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest are proportioned ingredients of Mg.

[0052] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N 2 and SF 6 Mixed gas as protective gas, by volume percentage, N 2 95%, SF 6 5%, first smelting metal Mg, after it is completely melted, add Mg-30%Si master alloy, pure Sn and Mg-30%Sr master alloy in sequence, and control the melting temperature to 700°C to obtain liquid metal.

[0053] (3) Casting: The molten metal is poured at ...

Embodiment 3

[0057] Sr-containing heat-resistant cast magnesium alloy, the components and mass percentages are Sn: 4%, Si: 2%, Sr: 0.5%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest are Mg.

[0058] The preparation method is as follows:

[0059] (1) Ingredients: The raw materials are pure Mg with a purity of 99.9%, pure Sn with a purity of 99.9%, and Mg-30%Si and Mg-30%Sr master alloys, according to the mass percentage of elements Sn: 4%, Si: 2%, Sr: 0.5%, impurity content Fe≤0.005%, Cu≤0.015%, Ni≤0.002%, and the rest is the proportion of Mg.

[0060] (2) Melting: Use iron crucible to melt in well-type resistance furnace, using N 2 and SF 6 Mixed gas as protective gas, by volume percentage, N 2 95%, SF 6 5%, first smelting metal Mg, after it is completely melted, add Mg-30%Si master alloy, pure Sn and Mg-30%Sr master alloy in sequence, and control the melting temperature to 700°C to obtain liquid metal.

[0061] (3) Casting: The molten metal is poured at 680°C. ...

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Abstract

The invention discloses a Sr-containing heat-resisting casting magnesium alloy. The magnesium alloy is characterized by comprising the following components in percentage by mass: 3.5 to 5.5 percent of Sn, 1 to 3 percent of Si, 0.5 to 3 percent of Sr and the balance of Mg and impurities. Sn and Si elements are added in a combination manner to generate Mg2Sn and Mg2Si high-temperature strengthening phases; a Sr element is added to refine the Mg2Si phase; simultaneously, a thermal stabilization phase MgSnSr of which the heat resistance is higher than that of Mg2Sn is formed. Compared with the conventional heat-resisting casting magnesium alloy, the Sr-containing heat-resisting casting magnesium alloy has excellent room temperature and high-temperature performance and low production cost, and can be widely applied to production of automobiles, electronics and space flight and aviation parts.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a heat-resistant casting magnesium alloy containing Sr. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application, with a small specific gravity (1.75~1.85×10 3 kg / m 3 , about 64% of aluminum, 23% of steel), high specific strength and specific stiffness, good damping and machinability, large impact energy absorption, and easy recycling, etc., in the fields of automobiles, aerospace, electronics, etc. It has been widely used and is considered to be an ideal material for effectively reducing weight, saving energy, being environmentally friendly and conducive to sustainable development. However, the strength of magnesium alloy is not high, and its heat resistance is poor, which limits its application range. Due to the low strength, magnesium alloy parts used in automobiles and other fie...

Claims

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Application Information

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IPC IPC(8): C22C23/00
Inventor 邱克强尤俊华任英磊李庆丰郝帅
Owner SHENYANG POLYTECHNIC UNIV
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