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Mg-Li-Sn alloy with flame retardance and machining process thereof

A mg-li-sn and alloy technology, applied in the field of alloys, can solve the problems such as the inability to meet the requirements of combustion resistance, and achieve the effects of being convenient for industrialized large-scale application, low production cost, and simple smelting and processing method.

Inactive Publication Date: 2018-01-26
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a structural material, it is far from enough to meet the requirements of only having combustion resistance during smelting. More importantly, the final magnesium-lithium alloy product must also have satisfactory mechanical strength, at least reaching the level commonly used. Mechanical properties of magnesium-lithium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A Mg-Li-Sn magnesium-lithium alloy with combustion resistance when smelting at 720 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 10.6wt.%, Sn: 2.8wt.%, Sr: 4.9wt.%, Mn: 0.6wt.%, Dy: 0.1wt.%, Ho: 0.2wt .%, S: 0.9wt.%, B: 0.3wt.%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the atmospheric environment, and use a silicon carbide crucible. Induction heating to 720 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 720 degrees for 10 minutes for casting. The ingot was deformed at room temperature, and the rolling reduction in each pass was 16%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 290 degrees, 3.2 hours. The final heat treatment process after rolling is: vacuum so...

Embodiment 2

[0019]A Mg-Li-Sn magnesium-lithium alloy with combustion resistance when smelting at 760 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 11.3wt.%, Sn: 7.8wt.%, Sr: 4.2wt.%, Mn: 0.3wt.%, Dy: 0.2wt.%, Ho: 0.2wt .%, S: 0.9wt.%, B: 0.3wt.%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the protection of the atmosphere, and use a silicon carbide crucible. Induction heating to 760 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 760°C for 10 minutes for casting. The ingot was deformed at room temperature, and the rolling reduction in each pass was 16%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 290 degrees, 3.2 hours. The final heat treatment process after rolling is: vacuum solu...

Embodiment 3

[0021] A Mg-Li-Sn magnesium-lithium alloy with combustion resistance when smelted at 690 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 10.4wt.%, Sn: 2.9wt.%, Sr: 4.6wt.%, Mn: 0.78wt.%, Dy: 0.2wt.%, Ho: 0.3wt .%, S: 1.1wt.%, B: 0.3wt.%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the atmospheric environment, and use a silicon carbide crucible. Induction heating to 690 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is poured into a water glass mold at 690 degrees for 10 minutes for casting. The ingot was deformed at room temperature, and the rolling reduction in each pass was 16%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 290 degrees, 3.2 hours. The final heat treatment process after rolling is: vacuum so...

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Abstract

The invention discloses a Mg-Li-Sn alloy with flame retardance and a machining process thereof, and unshielded melting of the Mg-Li-Sn alloy under the atmospheric condition can be achieved. The alloyis composed of, by weight, 10.0-12.0% of Li, 2.0-9.0% of Sn, 4.0-6.0% of Sr, 0.2-0.8% of Mn, 0.1-0.2% of Dy, 0.2-0.3% of Ho, 0.8-1.2% of S, 0.2-0.4% of B, and the balance Mg. The solution of a novel material is provided specific to the current situation that a Mg-Li alloy needs shielded melting during melting under high temperature currently. The Mg-Li-Sn flame-retardant alloy with the excellent flame retardance is obtained by an alloying method, and unshielded melting of the Mg-Li alloy under the atmospheric condition is achieved. When the alloy is exposed in the atmosphere under high temperature, an oxide layer and a nitride film are formed on the surface of the alloy. The films are compact in structure and high in spreadability, and the films are solid and not prone to volatilizing under high temperature and can provide excellent protection so that a magnesium alloy melt can be prevented from being further oxidized. The obtained Mg-Li alloy material has the mechanical performance asa traditional Mg-Li alloy under the room temperature, and further has the high heat transfer coefficient which is not possessed by the traditional Mg-Li alloy, specifically, the heat transfer coefficient of the obtained Mg-Li alloy material is 110-120 W / m.K and the heat conductivity coefficient of the traditional material is about 80 W / m.K.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] Magnesium alloy has the advantages of low density, good heat dissipation, high specific strength and specific stiffness, good electromagnetic shielding performance and abundant raw materials. It has a long application history in aerospace, automobile and other fields. However, the magnesium alloy has a hcp structure and its plastic deformation ability is poor, which limits its performance and application range to a large extent. The densities of magnesium and lithium are 1.73 and 0.53 g / cm3, respectively. After adding lithium to magnesium alloy, not only the density of the alloy can be further reduced, but also its processing performance can be greatly improved. Magnesium-lithium alloy is the lowest density and lightest special alloy among metal structural materials, and is called ultra-light alloy in the industry. The li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06C22F1/02
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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