Mg-Li-Ho alloy, and fused salt electrolysis preparation and apparatus thereof

Abstract

The invention provides a Mg-Li-Ho alloy and a method for preparing the same by molten salt electrolysis. The method comprises the following steps of: adding Ho2O3 in an electrolytic furnace by taking MgCl2 plus LiCl plus KCl plus KF as an electrolyte system, and heating up the mixed electrolyte system to fuse at a temperature of 650 DEG C; depositing the Mg-Li-Ho alloy in a molten salt bath close to a cathode via electrolyzing for 1 to 2 hours with a sunk cathode method with metal molybdenum (Mo) as the cathode, graphite as an anode, cathode current density between 12 and 16 A / cm<2>, anode current density between 0.5 and 0.6 A / cm<2> and bath voltage between 4.6 and 7.6V. The method completely uses metal compounds as raw materials to directly prepare the Mg-Li-Ho alloy through molten salt electrolysis, without using metal magnesium, lithium or metal holmium. Therefore, the method greatly shortens the production flow, simplifies the process, decreases the electrolysis temperature, and can reduce the production cost of the alloy.

Description

(1) Technical field [0001] The invention relates to an alloy, specifically a magnesium lithium holmium alloy. The invention also relates to a preparation method of the magnesium-lithium-holmium alloy. The invention also relates to a molten salt electrolysis device for magnesium-lithium-holmium alloy. (2) Background technology [0002] Mg-Li alloy has higher specific strength and specific stiffness, better shock absorption and electromagnetic shielding, and is one of the most ideal lightweight structural materials in the aerospace and weapon industries. However, due to the low strength and poor dimensional stability (creep resistance) of this alloy, its further application is hindered. At present, it is difficult to meet the requirements of fast-developing science and technology for lightweight materials only through alloying. The emergence of metal matrix composites provides a new effective way to strengthen and improve the dimensional stability of Mg-Li alloys. In the l...

AI Technical Summary

Problems solved by technology

Traditional manufacturing methods of magnesium-lithium alloys, such as the doping method, have a series of problems such as long process, high energy consumption, large metal loss, and serious environmental pollution. However, the literature proposes electrodepositing lithium on liquid magnesium (or solid magnesium) cathodes. Although the method of forming an alloy has been improved to a certain extent, it is still necessary to prepare metal magnesium (or magnesium alloy) first, which does not fundamentally solve the disadvantages of a long process.

[0003] For the blending method, each single metal needs to be produced first, and then mixed, melted, stirred, and cast ingots in proportion, which requires many procedures and high energy consumption

The mixing method has its shortcomings: the prepared magnesium-lithium alloy will inevitably produce severe segregation of metal lithium and rare earth; because magnesium, lithium, and rare earth have a large difference in specific gravity, lithium and rare earth cannot be well dispersed in magnesium

[0004] The solid-state cathode method proposed in the prior art to prepare alloy patents, such as the patent "Mg-Li alloy prepared by molten salt electrolysis" with application number 200610010331.9, discloses a kind of solid magnesium as the cathode, and the lithium in the electrolyte is precipitated and released to the The magnesium cathode diffuses to form a magnesium-lithium alloy, which melts into a liquid state due to its low melting point. This method is called the self-consumable cathode method. The electrolysis temperature of this method is significantly lower, but metal magnesium still needs to be produced first.

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