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Flame-retardant aluminum-lithium alloy containing Y and Te, and processing technology thereof

An aluminum-lithium alloy and alloy technology, applied in the field of alloys, can solve problems such as limiting the industrial application of Be and Ca, failing to meet the requirements of combustion resistance, and damaging the mechanical properties of aluminum-lithium alloys, achieving good casting performance and reducing the content of flame-retardant elements , the effect of low high temperature strength

Inactive Publication Date: 2018-03-02
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 aluminum-lithium alloy containing Y and Te with combustion resistance when smelted at 720 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.3wt.%, Y: 2.8wt.%, Sr: 2.3wt.%, Te: 1.6wt.%, Ca: 1.9wt.%, Mn: 1.8wt .%, Ba:0.6wt.%, Er: 0.4wt.%, Dy: 0.2wt.%, 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: 220 degrees, 2.8 hours; the final heat treatment process after rolli...

Embodiment 2

[0020]An aluminum-lithium alloy containing Y and Te that has combustion resistance when smelted at 740 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 6.9wt.%, Y: 3.5wt.%, Sr: 3.8wt.%, Te: 1.6wt.%, Ca: 2.1wt.%, Mn: 1.6wt .%, Ba:0.8wt.%, Er: 0.5wt.%, Dy: 0.2wt.%, 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 740 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 740 degrees for 10 minutes for casting. The ingots were deformed at room temperature with a rolling reduction of 8% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 220 degrees, 2.8 hours; the final heat treatment process after ...

Embodiment 3

[0022] An aluminum-lithium alloy containing Y and Te with combustion resistance when smelted at 750 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li:5.6wt.%, Y:3.2wt.%, Sr:2.9wt.%, Te:1.6wt.%, Ca:1.8wt.%, Mn:1.6wt .%, Ba: 1.2wt.%, Er: 0.5wt.%, Dy: 0.2wt.%, 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 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 10% in each pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 220 degrees, 2.8 hours; the final heat treatment process after rolling is: v...

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Abstract

The invention discloses a flame-retardant aluminum-lithium alloy containing Y and Te when smelted between 700-800 degrees and a processing technology thereof. In terms of weight percentage, the chemical composition of the alloy is: Li: 4.0‑8.0wt.%, Y: 2.0‑4.0wt.%, Sr: 2.0‑6.0wt.%, Te: 1.0‑2.0wt.%, Ca: 1.0 ‑3.0wt.%, Mn: 1.0‑2.0wt.%, Ba: 0.5‑1.5wt.%, Er: 0.2‑0.6wt.%, Dy: 0.2‑0.3wt.%, 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 during smelting at high temperatures. 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 aluminum-lithium melt. The alloy melt has extremely excellent flame retardant properties under static conditions, and can be kept in the atmosphere for 5 hours without obvious combustion in the range of 700-800 degrees. In the dynamic process, such as stirring and gas blowing of the liquid alloy, when the surface film is destroyed by violent stirring, it can still be regenerated quickly, successfully preventing the oxidative combustion of the alloy.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] The density of lithium is very small (0.53 g / cm 3 ), which is 1 / 14 of steel, 1 / 5 of aluminum, and 1 / 3 of magnesium. When lithium is added to aluminum, it forms the most lightweight aluminum-lithium alloy structural material ever. It has good specific strength and elastic modulus, and its density is only 2.4g / cm 3 . With the increase of lithium content, the density of aluminum-lithium alloy can be further reduced, and it has more excellent cold and hot deformation ability, better corrosion resistance and suitable ductility. Generally speaking, every addition of 1wt.% lithium can reduce the density of aluminum alloy by 3% and increase the modulus by 6%. [0003] Aluminum-lithium alloy has excellent mechanical properties, high damping performance for shock and noise reduction, and anti-radiation and anti-electromagnetic in...

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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