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High damping flame-retardant Al-Li-Cd-S aluminum lithium alloy

An aluminum-lithium alloy, high damping technology, applied in the field of alloys, can solve the problems of limiting the industrial application of Be and Ca, failing to meet the requirements of anti-combustion performance, damaging the mechanical properties of the aluminum-lithium alloy, etc. The effect of simple processing method and reduced equipment requirements

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 satisfying the requirements only to have the anti-combustion performance during smelting. More importantly, the final aluminum-lithium alloy product must also have satisfactory mechanical strength and damping performance, at least Can reach the level of mechanical properties of commonly used aluminum-lithium 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] A highly damped Al-Li-Cd-S aluminum-lithium alloy with combustion resistance when smelted at 710 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 2.9wt.%, Cd: 3.6wt.%, Si: 2.1wt.%, Sr: 3.5wt.%, Ca: 2.6wt.%, Pr: 0.3wt .%, Th: 0.1wt.%, S: 0.9wt.%, 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 710 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is kept at 710 degrees for 10 minutes and cast into the equipment at the same level as the hot top for semi-continuous casting, and the ingot moving speed is 7m / min. 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 ha...

Embodiment 2

[0020]A highly damped Al-Li-Cd-S aluminum-lithium alloy with combustion resistance when smelted at 740 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 3.6wt.%, Cd: 4.2wt.%, Si: 2.6wt.%, Sr: 2.8wt.%, Ca: 3.2wt.%, Pr: 0.2wt .%, Th: 0.1wt.%, S: 0.9wt.%, 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 740 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is kept at 740 degrees for 10 minutes and cast into the equipment at the same level as the hot top for semi-continuous casting, and the ingot moving speed is 8m / min. The ingot was deformed at room temperature with a rolling reduction of 9% per pass. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardeni...

Embodiment 3

[0022] A highly damped Al-Li-Cd-S aluminum-lithium alloy with combustion resistance when smelted at 780 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 3.9wt.%, Cd: 2.8wt.%, Si: 2.5wt.%, Sr: 3.4wt.%, Ca: 2.5wt.%, Pr: 0.3wt .%, Th: 0.1wt.%, S: 0.8wt.%, 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 780 degrees to form an alloy solution, and use the electromagnetic effect to fully stir for about 10 minutes. The alloy liquid is kept at 780 degrees for 10 minutes and cast into the equipment at the same level as the hot top for semi-continuous casting, and the ingot moving speed is 8m / min. 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 ...

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Abstract

The invention discloses a high-damping Al-Li-Cd-S aluminum-lithium alloy with combustion resistance when smelted between 700-800 degrees and a processing technology thereof. In terms of weight percentage, the composition of the alloy is: Li:2.0‑4.0wt.%, Cd:2.0‑5.0wt.%, Si:2.0‑3.0wt.%, Sr:2.0‑6.0wt.%, Ca:2.0‑ 4.0wt.%, Pr: 0.2‑0.4wt.%, Th: 0.1‑0.2wt.%, S: 0.5‑1.0wt.%, B: 1.0‑1.5wt.%, and the balance is aluminum. The invention 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 form a dense and durable protective film on the surface of the aluminum-lithium melt, the ignition temperature of the aluminum-lithium alloy can be significantly increased. The material has the mechanical properties of traditional aluminum-lithium alloys, and has high damping performance that traditional aluminum-lithium alloys do not have: SDC=3-10%, and traditional materials are about SDC=0.5-0.8%. The alloy is induction smelted under the atmosphere, the smelting and processing method is simple, and the production cost is relatively low. While ensuring the damping performance, the service life of the alloy is further improved, which is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Aluminum-lithium alloys are alloys of lithium plus aluminum and other elements. Depending on the composition of the alloy, the density of Al-Li alloy can be 2.1-2.5g / cm 3 change between. Aluminum-lithium alloy is the technological frontier of aluminum alloy development and is known as the most green and environmentally friendly revolutionary material in the future. Generally speaking, every time 1wt.% lithium is added to aluminum alloy, the density of aluminum alloy will decrease by about 3%, while its modulus of elasticity will increase by about 6%. Since the cost of aluminum-lithium alloy is about 10% of that of composite materials (carbon fiber reinforced plastics), it has obvious comparative advantages in application and has become a strong competitive product of composite materials (carbon fiber reinforced plastics)....

Claims

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Application Information

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