Mg-Li-Ge alloy with flame retardance and preparation technology thereof

Abstract

The invention discloses a Mg-Li-Ge alloy smelted without protection in atmosphere condition and a preparation technology thereof. The alloy is prepared from, by weight, 6.0-19.0 wt. % of Li, 2.0-6.0 wt. % of Ge, 2.0-8.0 wt. % of Sr, 0.8-2.6 wt. % of S, 0.2-0.8 wt. % of Ce, 0.2-0.6 wt. % of Ho, 0.2-0.4 wt. % of Pr, 0.6-0.8 wt. % of V and the balance of magnesium. According to the alloy and the preparation technology, the Mg-Li-Ge flame-retardant magnesium alloy with an excellent flame retardant effect is obtained by means of an alloying method, and when the alloy is exposed to the atmosphere at high temperature, a layer of oxide and nitride film compact in structure and high in spreadability is generated on the surface of the alloy. The film is in a solid state at high temperature and unlikely to volatilize, can provide good protection and prevent magnesium alloy melt from being further oxidized, so that unprotected smelting of magnesium lithium alloy in the atmosphere condition is achieved. The obtained magnesium lithium alloy material has the mechanical properties of traditional magnesium lithium alloy at room temperature and has a high heat transfer coefficient of 110-120 W/m.K which the traditional magnesium lithium alloy does not have, while the heat transfer coefficient of the traditional material is around 80 W/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...

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.