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Magnesium alloy and preparing method thereof

A technology of magnesium alloy and master alloy, which is applied in the field of metal alloys, can solve the problems of low cost and inability of magnesium alloy to have thermal conductivity, etc., and achieve the effect of good die-casting performance, less types and dosage, and excellent thermal conductivity

Inactive Publication Date: 2016-10-05
ZTE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a magnesium alloy, which aims to solve the technical problem that the existing magnesium alloy cannot have both good thermal conductivity and low cost

Method used

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  • Magnesium alloy and preparing method thereof
  • Magnesium alloy and preparing method thereof
  • Magnesium alloy and preparing method thereof

Examples

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preparation example Construction

[0037] The present invention also provides a method for preparing a magnesium alloy. In a preferred embodiment, the method for preparing a magnesium alloy includes the following steps:

[0038] S1. Provide raw materials: magnesium ingots, zinc ingots, magnesium-samarium master alloys and magnesium-zirconium master alloys, and weigh the raw materials according to the weight percentages of the components in the above-mentioned magnesium alloys;

[0039] S2, preheating the raw materials;

[0040] S3, place the magnesium ingot in N 2 and SF 6 Heating to complete melting under the protection of mixed gas, and controlling the magnesium melt to maintain at 650°C to 780°C; adding magnesium-samarium master alloy to the magnesium melt at 680°C to 750°C until the magnesium-samarium master alloy is completely melted; then Add zinc ingots, after the zinc ingots are completely melted, add magnesium-zirconium master alloy into the melt at 750°C~780°C until the magnesium-zirconium master al...

Embodiment 1

[0046] The Mg-3Sm-0.5Zr (wt.%) magnesium alloy of 50Kg and its die casting preparation method:

[0047]1. Ingredients: Weigh 43.2Kg of magnesium ingot, 6Kg of Mg-25Sm master alloy and 0.84Kg of Mg-30Zr master alloy, wherein the purity of magnesium ingot is 99.94wt.%, Mg-25Sm master alloy and Mg-30Zr The purity of the master alloy is 99.9 wt.%.

[0048] 2. Preheating: Preheating each component with the above-mentioned ingredients.

[0049] 3. Melting: Put all the magnesium ingots into the well-type resistance crucible furnace as tightly as possible; seal the crucible and put it into SF 6 and N 2 After the mixed gas, the temperature is raised to completely melt the magnesium ingot under the protective gas, and the temperature of the magnesium is kept at 680-780°C; when the temperature of the magnesium melt rises to 680-750°C, add the preheated Mg-25Sm master alloy into the magnesium melt Keep the temperature in the liquid for an appropriate time until the Mg-Sm master alloy i...

Embodiment 2

[0060] The Mg-3.5Sm-0.6Zr (wt.%) magnesium alloy of 50Kg and its die-casting preparation method:

[0061] Ingredients: Weigh 42Kg of magnesium ingot, 7Kg of Mg-25Sm master alloy and 1Kg of Mg-30Zr master alloy, wherein the purity of magnesium ingot is 99.94wt.%, the purity of Mg-25Sm master alloy and Mg-30Zr master alloy It is 99.9wt.%. Other steps are basically the same as in Example 1.

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Abstract

The invention discloses a magnesium alloy. The magnesium alloy comprises, by weight percentage, 0-0.1% of Zn, 2%-4% of Sm, 0.1%-0.8% of Zr, 0-0.2% of impurities and the balance Mg. The invention further discloses a preparing method for the magnesium alloy. The thermal conductivity of the magnesium alloy at 25 DEG C is larger than 110 W (m.k)<1>, and the magnesium alloy has the excellent heat-conducting property; in addition, only a small amount of Sm, Zr and Zn are added in the magnesium alloy, the types and the using amounts of the added metal elements are fewer, and the cost is greatly reduced; moreover, at 25 DEG C, the strength of extension of the magnesium alloy ranges from 175 MPa to 230 MPa, the yield strength ranges from 102 MPa to 130 MPa, the ductility ranges from 6% to 11%, and the mechanical property is good; and the rate of finished products of castings ranges from 85% to 95%, and the pressure casting performance is good.

Description

technical field [0001] The invention relates to the field of metal alloys, in particular to a magnesium alloy and a preparation method thereof. Background technique [0002] Heat dissipation materials for aerospace, automotive and 3C products not only pursue low density and high strength, but also require good thermal conductivity. Although magnesium alloy has low density and high specific strength, the room temperature thermal conductivity of pure magnesium is 156W(m.K) -1 , only 65.4% of pure aluminum under the same conditions. In addition to QE22 magnesium alloys, currently existing magnesium alloys with high thermal conductivity are generally Mg-Zn series, such as ZE41, Mg-Zn-Sn, Mg-Zn-Sn-Ca, Mg-Zn-Si, etc. Thermal conductivity up to 110W(m.K) at room temperature -1 . Some Mg-Ca-based magnesium alloys (such as Mg-Ca-Sn) have a thermal conductivity greater than 126.3W (m.K) at 25°C -1 . Although Zn and Ca elements have little effect on the thermal conductivity of pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03
Inventor 李丽李胜勇李德江曾小勤彭典明刘金
Owner ZTE CORP
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