Preparation of reactive metal based alloy

Abstract

The invention discloses a method for preparing an active metal based alloy, which belongs to the field of non-ferrous metallurgy and comprises the following steps: adopting a molten salt electrolytic codeposition method; selecting an alloy using a relatively active metal as a matrix; using chloride and oxide of alloying elements as raw materials; electrolyzing the raw materials in an alkali metal molten salt system; and controlling the electrolysis temperature to be between 400 and 1,200 DEG C to melt the materials. A mode of adding the raw materials continuously is adopted so that the proportion of each alloying element of the added raw materials accords with that of the designed alloy components, and the faraday electric quantity of the added raw materials in corresponding time interval accords with the electrolysis electric quantity simultaneously. The alloy obtained through electrolyzing can be taken out at any time and is consistent with the design components. The process is simple, convenient and practicable, and is suitable for the development of continuous production.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and relates to a novel method for preparing an alloy with a relatively active metal as a matrix. The method adopts molten salt system electrolytic co-deposition to directly prepare an alloy with a relatively active metal as a matrix. During the electrolysis process, by controlling the process conditions, the alloy with the same design composition is continuously prepared. Background technique [0002] Many alloys based on relatively reactive metals have excellent properties and thus have been widely used. For example, magnesium alloy has many excellent properties, such as low density, excellent mechanical and chemical properties, and can be recycled, so it is called "green alloy" and is widely used in various fields such as automobile industry, electronic products, Aviation, military, etc., and its usage has a tendency to increase significantly. Lithium alloys, on the other hand, have...

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Problems solved by technology

Shi Q.R. (Shi Q.R., Yuan L.Y., Zhao L.Z., Duan S.Z. Electrolytic codeposition of Y(III) and Al(III) and surface metalliding in molten fluorides-oxides systems. RareMetals, 1999, 18(1): 21-26.) in Electrolytic co-deposition was carried out in the fluoride molten salt system to prepare yttrium (Y)-based aluminum (Al) alloys. The study mentioned that the limit diffusion control of relatively inert Al precipitation can be used to polarize to the same precipitation as Y The alloy is co-deposited with Y under the potential, and at the same time, the limit diffusion current of aluminum ions with a relatively negative standard electrode potential is used to fix the precipitated composition, and the precipitation of the Y metal with a relatively positive standard electrode potential is controlled by the total current to achieve composition control. However, this is very difficult in practice

Since the actual limiting diffusion current is a function of time and concentration changes, it is impossible to ensure that the limiting diffusion current remains unchanged at each moment through actual operation, so it is impossible to perform accurate composition control from this point alone

In the above research work, a small-scale experiment of 200A was carried out, and an alloy containing Y90wt% was obtained, but no reasonable composition control method was proposed

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