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Mg-Li-Ga alloy with flame retardance and processing process thereof

A technology of alloys and magnesium-lithium alloys, applied in the field of alloys, can solve problems such as difficult to solve flame retardant effect and mechanical properties, combustion resistance can not meet the requirements, damage the mechanical properties of magnesium alloys, etc., to achieve large-scale industrial application, spreadability Strong, excellent protective effect

Inactive Publication Date: 2018-01-09
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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
Be and Ca are the first discovered alloy elements with good flame retardant effect, but the main bottleneck of the flame retardant Mg-Li alloy containing Be and Ca is that it is difficult to solve the contradiction between the flame retardant effect and the mechanical properties.
When a certain flame retardant effect is achieved, excessive Be and Ca will seriously damage the mechanical properties of magnesium alloys.
In addition, Be or the compound of Be has strong toxicity, which is extremely harmful to the human body and the environment
In addition, the surface protective film of Ca-containing flame-retardant magnesium alloy has poor regeneration ability, and once damaged, it loses its protective effect, and the burning speed of Ca-containing magnesium alloy is faster than that of pure magnesium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A Mg-Li-Ga magnesium-lithium alloy with combustion resistance when smelting at 730 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 8.9wt.%, Ga: 1.6wt.%, Sr: 4.6wt.%, Nd: 0.2wt.%, Gd: 0.1wt.%, Yb:0.2wt .%, B: 0.1wt.%, In: 0.6wt.%, 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 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 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, 1.2 hours. The final heat treatment process after rolling is: vacuum sol...

Embodiment 2

[0019]A Mg-Li-Ga magnesium-lithium alloy with combustion resistance when smelting at 720 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 8.6wt.%, Ga: 1.2wt.%, Sr: 7.3wt.%, Nd: 0.2wt.%, Gd: 0.1wt.%, Yb:0.2wt .%, B: 0.1wt.%, In: 0.6wt.%, 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 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, 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, 1.2 hours. The final heat treatment process after rolling is: vacuum solu...

Embodiment 3

[0021] A Mg-Li-Ga magnesium-lithium alloy with combustion resistance when smelted at 690 degrees. In terms of weight percentage, the chemical composition of the alloy is: Li: 11.3wt.%, Ga: 1.9wt.%, Sr: 4.2wt.%, Nd: 0.3wt.%, Gd: 0.2wt.%, Yb: 0.1wt .%, B: 0.1wt.%, In: 0.6wt.%, the balance is magnesium. The preparation method of the alloy: add the above-mentioned raw materials into the induction furnace under the protection of the atmosphere, and use a silicon carbide crucible. Induction heating to 690 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 690 degrees 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, 1.2 hours. The final heat treatment process after rolling is: vacu...

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Abstract

The invention discloses a Mg-Li-Ga alloy which can be smelted without protection under atmospheric conditions and a processing technology thereof. In terms of weight percentage, the composition of the alloy is: Li:8.0‑14.0wt.%, Ga:1.0‑2.0wt.%, Sr:2.0‑8.0wt.%, Nd:0.1‑0.4wt.%, Gd:0.1‑ 0.2wt.%, Yb: 0.1‑0.3wt.%, B: 0.1‑0.2wt.%, In: 0.6‑0.8wt.%, and the balance is magnesium. This patent obtains Mg‑Li‑Ga flame retardant magnesium alloy with excellent flame retardant effect through alloying method, and when the alloy is exposed to the atmosphere at high temperature, a layer of dense and spreadable oxide will be formed on the surface of the alloy. and nitride films. These films are solid and non-volatile at high temperatures, and can provide excellent protection against further oxidation of the magnesium alloy melt, thereby realizing the unprotected melting of magnesium-lithium alloys under atmospheric conditions. The obtained magnesium-lithium alloy material has the mechanical properties of traditional magnesium-lithium alloys at room temperature, and has a high heat transfer coefficient that traditional magnesium-lithium alloys do not have: 110-120W / m.K, while the thermal conductivity of traditional materials is about 80W / m.K.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a magnesium-lithium alloy. Background technique [0002] By adding metal lithium to metal magnesium, it has excellent mechanical properties of low density, high specific stiffness and high specific strength, high damping performance of shock absorption and noise cancellation, and anti-radiation and anti-electromagnetic interference performance, representing the magnesium alloy. The technological frontier of development is known as the most green and environmentally friendly revolutionary material in the future. Magnesium-lithium alloy is currently the lightest metal structure material, also known as ultra-light magnesium alloy, with a density of 1.3-1.6 g / cm 3 . It has the advantages of low density, high specific strength and good plastic processing performance. According to the different lithium content in magnesium-lithium alloys, magnesium-lithium alloys are generally divide...

Claims

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Application Information

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