Al-Li-Mn alloy with flame retardance

An alloy, aluminum-lithium alloy technology, applied in the field of alloys, can solve the problems of restricting the industrial application of Be and Ca, failing to meet the requirements of combustion resistance, and damaging the mechanical properties of aluminum-lithium alloys, so as to facilitate large-scale industrial application and block oxygen intrusion The effect of simple alloy liquid and smelting processing methods

Inactive Publication Date: 2017-12-15
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 aluminum-lithium alloy product must also have satisfactory mechanical strength, at least reaching the level commonly used. Mechanical properties of Al-Li alloys
It was reported earlier that the addition of Be and Ca to Al-Li alloys can significantly improve the oxidation resistance of Al-Li alloys, but Be is highly toxic, and excessive Ca will seriously damage the mechanical properties of Al-Li alloys, which greatly limits the performance of Be. Industrial Application of Li and Ca in Flame Retardant Al-Li Alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An Al-Li-Mn aluminum-lithium alloy with combustion resistance when smelted at 720 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.3wt.%, Mn: 1.9wt.%, Sr: 4.8wt.%, Ba: 1.6wt.%, Sc: 1.3wt.%, Pr: 0.4wt .%, Tb: 0.3wt.%, B: 1.2wt.%, the balance is aluminum. 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 with a rolling reduction of 6% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 210 degrees, 2.9 hours; the final heat treatment process after rolling is: vacuum solution ...

Embodiment 2

[0020] An Al-Li-Mn aluminum-lithium alloy with combustion resistance when smelted at 750 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.3wt.%, Mn: 1.6wt.%, Sr: 2.6wt.%, Ba: 1.5wt.%, Sc: 1.2wt.%, Pr: 0.4wt .%, Tb: 0.2wt.%, B: 1.6wt.%, the balance is aluminum. 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 750 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 750°C for 10 minutes for casting. The ingots were deformed at room temperature with a rolling reduction of 7% per pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 210 degrees, 2.9 hours; the final heat treatment process after rolling is: vacuum solution treatmen...

Embodiment 3

[0022]An Al-Li-Mn aluminum-lithium alloy with combustion resistance when smelted at 790 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 3.8wt.%, Mn: 2.6wt.%, Sr: 3.6wt.%, Ba: 1.4wt.%, Sc: 1.3wt.%, Pr: 0.4wt .%, Tb: 0.3wt.%, B: 1.6wt.%, the balance is aluminum. 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 790 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 790°C for 10 minutes for casting. The ingot was deformed at room temperature with a rolling reduction of 6% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 210 degrees, 2.9 hours; the final heat treatment process after rolling is: vacuum solution treatme...

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Abstract

The invention discloses an Al-Li-Mn aluminum-lithium alloy with combustion resistance when smelted between 700-800 degrees and a processing technology thereof. In terms of weight percentage, the chemical composition of the alloy is: Li: 2.0‑6.0wt.%, Mn: 1.0‑3.0wt.%, Sr: 2.0‑6.0wt.%, Ba: 1.0‑2.0wt.%, Sc: 1.0 ‑2.0wt.%, Pr: 0.1‑0.8wt.%, Tb: 0.2‑0.4wt.%, B: 1.0‑2.0wt.%, and the balance is aluminum. This patent provides a novel material science solution for the current situation that aluminum-lithium alloys need to be protected and smelted at high temperatures. The type, composition and content of the oxide film and nitride film formed on the surface of the melt are changed by screening alloying elements. In the process of melt treatment such as stirring and air blowing, when the surface film is destroyed by violent stirring, it can still be regenerated quickly, successfully preventing the oxidative combustion of the alloy. The obtained alloy surface oxide film and nitride film have very good plasticity and viscosity, can completely spread and cover the alloy surface, and effectively prevent oxygen from invading into the alloy liquid.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Li is the lightest metallic element and when added to aluminum forms an aluminum-lithium alloy. Every addition of 1wt.% Li can reduce the density of the aluminum alloy by 3% and increase the modulus by 6%. Compared with other alloy materials, aluminum-lithium alloy has the following characteristics: (1) The density is small. The density of aluminum-lithium alloy is close to 2.3-2.4g / cm 3 , about 1 / 3 of iron or copper. (2) High strength. Al-Li alloys can be strengthened after a certain degree of cold working, and some Al-Li alloys can also be strengthened by heat treatment. (3) Good electrical conductivity. The electrical conductivity of aluminum-lithium alloys is second only to silver, copper and gold. (4) Good corrosion resistance. The surface of aluminum-lithium alloy is easy to naturally form a dense and firm alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/02C22F1/04C22F1/02
CPCC22C21/00C22C1/026C22F1/02C22F1/04
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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