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Mg-Li-W alloy with flame retardance and processing technology thereof

An alloy, magnesium-lithium alloy technology, applied in the field of alloys, can solve the problems of restricting the industrial application of magnesium alloys, failing to meet the requirements of combustion resistance, damaging the mechanical properties of magnesium alloys, etc. The effect of improved mechanical properties and low production cost

Inactive Publication Date: 2018-03-30
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
Generally, sufficient amounts of Be and Ca are added to significantly improve the oxidation resistance of magnesium-lithium alloys, but due to the severe toxicity of Be and sufficient amounts of Be and Ca will seriously damage the mechanical properties of magnesium alloys, the magnesium alloys containing Be and Ca are limited. Industrial application of alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A Mg-Li-W magnesium-lithium alloy with combustion resistance when smelting at 710 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 10.6wt.%, W: 2.8wt.%, Ca: 2.7wt.%, Sr: 1.9wt.%, Eu: 0.3wt.%, Th: 0.2wt .%, S: 0.8wt.%, B: 1.9wt.%, 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 710 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 710°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: 230 degrees, 1.8 hours. The final heat treatment process after rolling is: vacuum solution t...

Embodiment 2

[0021]A Mg-Li-W magnesium-lithium alloy with combustion resistance when smelted at 700 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 8.6wt.%, W: 2.9wt.%, Ca: 3.1wt.%, Sr: 2.6wt.%, Eu: 0.3wt.%, Th: 0.2wt .%, S: 0.8wt.%, B: 1.6wt.%, 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 700 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 700 degrees for 10 minutes for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 18%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 230 degrees, 1.8 hours. The final heat treatment process after ...

Embodiment 3

[0023] A Mg-Li-W magnesium-lithium alloy with combustion resistance when smelting at 730 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 7.9wt.%, W: 3.5wt.%, Ca: 3.1wt.%, Sr: 2.8wt.%, Eu: 0.3wt.%, Th: 0.2wt .%, S: 0.9wt.%, B: 1.1wt.%, 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 730 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 730 degrees for 10 minutes for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 18%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 230 degrees, 1.8 hours. The final heat treatment process afte...

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Abstract

The invention discloses a Mg-Li-W alloy with combustion resistance when smelted between 680-780 degrees and a processing technology thereof. By weight percentage, Li: 2.0‑18.0wt.%, W: 2.0‑5.0wt.%, Ca: 2.0‑6.0wt.%, Sr: 1.0‑4.0wt.%, Eu: 0.2‑0.4wt.%, Th: 0.1-0.4wt.%, S: 0.5-1.4wt.%, B: 1.2-2.8wt.%, and the balance is magnesium. The invention provides a novel material science solution for the current situation that protective melting of magnesium-lithium alloys at high temperatures needs to be carried out during melting. By screening the alloy elements to change the type, composition and content of the oxide film and nitride film formed on the surface of the melt, a dense and durable protective film is formed on the surface of the magnesium-lithium melt. The ignition temperature of the magnesium-lithium alloy can be obviously increased, and the burning phenomenon of the magnesium-lithium alloy smelted in the atmospheric state can be effectively prevented. The obtained magnesium-lithium alloy material has the mechanical properties of traditional magnesium-lithium alloys at room temperature, and has high-temperature mechanical properties that traditional magnesium-lithium alloys do not have: at 150 degrees, the yield strength is 100-120MPa, while the traditional material at 150 degrees, yields The strength is about 65MPa.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] The density of magnesium is 1.738g / cm 3 , the density of lithium is 0.534g / cm 3 . Lithium is added to magnesium to form a magnesium-lithium alloy, and the density of the alloy is generally 1.25-1.60g / cm 3 . As the lightest metal structural material, magnesium-lithium alloy has high specific strength and specific stiffness, and is easy to deform, process and recycle. These advantages endow the magnesium-lithium alloy with the reputation of green metal material in the 21st century, making it an ideal structural material in the fields of aviation, aerospace, national defense, nuclear industry, automobile manufacturing, and medical equipment. Due to the difference in lithium content, the intrinsic structure of magnesium-lithium alloys is also different. When the lithium content is less than 5.7wt.%, the magnesium-lithium a...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06C22F1/02
CPCC22C23/00C22C1/02C22F1/02C22F1/06
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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