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High thermal conductive flame-retardant Al-Li-Ni-Se aluminum lithium alloy

An aluminum-lithium alloy, high thermal conductivity technology, applied in the field of alloys, can solve problems such as the inability to meet the requirements of combustion resistance, and achieve the effects of high thermal cracking tendency, good flame retardant effect, good plasticity and viscosity

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high thermal conductivity Al-Li-Ni-Se aluminum-lithium alloy with combustion resistance when smelting at 710 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.3wt.%, Ni: 1.2wt.%, Se: 1.6wt.%, Sr: 2.8wt.%, Ca: 2.3wt.%, Th: 0.2wt .%, B: 0.6wt.%, S: 1.3wt.%, 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 poured into a water glass mold at 710°C for 10 minutes for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 12%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 210 degrees, 1.2 hours. The final heat...

Embodiment 2

[0020]A high thermal conductivity Al-Li-Ni-Se aluminum-lithium alloy with combustion resistance when smelted at 750 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 6.2wt.%, Ni: 2.3wt.%, Se: 1.5wt.%, Sr: 2.4wt.%, Ca: 2.6wt.%, Th: 0.2wt .%, B: 0.8wt.%, S: 1.4wt.%, 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: 210 degrees, 1.2 hours. The final heat treatment process after roll...

Embodiment 3

[0022] A high thermal conductivity Al-Li-Ni-Se aluminum-lithium alloy with combustion resistance when smelting at 780 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 5.7wt.%, Ni: 2.3wt.%, Se: 1.4wt.%, Sr: 2.6wt.%, Ca: 2.1wt.%, Th: 0.2wt .%, B: 0.6wt.%, S: 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 poured into a water glass mold at 780 degrees for 10 minutes for casting. The ingot was subjected to deformation treatment at room temperature, and the rolling reduction in each pass was 12%. Every 3 passes of rolling requires an intermediate heat treatment to eliminate work hardening, the process is: 210 degrees, 1.2 hours. The fina...

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Abstract

The invention discloses a high thermal conductivity flame-retardant Al-Li-Ni-Se aluminum-lithium alloy smelted between 700-800 degrees and a processing technology thereof. In terms of weight percentage, the chemical composition of the alloy is: Li:2.0‑8.0wt.%, Ni:1.0‑5.0wt.%, Se:1.0‑2.0wt.%, Sr:2.0‑3.0wt.%, Ca:2.0 ‑4.0wt.%, Th: 0.1‑0.5wt.%, B: 0.5‑1.5wt.%, S: 1.0‑1.5wt.%, and the balance is aluminum. The present invention provides a novel solution to the current situation that aluminum-lithium alloys need to be protected and smelted during smelting at high temperatures. Through the optimal alloying method, not only the disadvantage of the amount of alloying elements used can be greatly reduced, but also a very good flame retardant effect can be obtained. While the content of flame retardant elements is significantly reduced, the ignition point of the alloy is greatly increased. The obtained alloy surface oxide film has very good plasticity and viscosity, can completely spread and cover the alloy surface, and effectively prevent oxygen from invading into the alloy liquid. While ensuring the mechanical properties of common aluminum-lithium alloys, it has high thermal conductivity that traditional aluminum-lithium alloys do not have: the heat transfer coefficient is 120-140W / m.K, while the traditional aluminum-lithium alloy is about 85W / m.K.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an aluminum-lithium alloy. Background technique [0002] Sustainable development, energy saving and emission reduction, and lightweight are hot topics that people pay attention to and discuss in today's society. Accelerating the development and utilization of aluminum alloy materials is one of the important measures to achieve sustainable development. Aluminum-lithium alloys are lower than ordinary aluminum alloys, with a density of 1.35-1.65 g / cm 3 between. Compared with steel structural parts, aluminum-lithium alloy can reduce weight by 40-50%, and compared with general aluminum alloy, it can reduce weight by 20-30%. Adding 1wt.% lithium to aluminum alloy can reduce the density of aluminum alloy by 3% and increase the modulus by 6%. After adding lithium, it can not only reduce the specific gravity of the aluminum alloy, but also increase the rigidity, while still maintaining...

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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