Method for preparing aluminum gadolinium samarium intermediate alloy from gadolinium carbonate and samaric carbonate through molten salt electrolysis

Abstract

The invention provides a method for preparing aluminum gadolinium samarium intermediate alloy from gadolinium carbonate and samaric carbonate through molten salt electrolysis. AlF3-NaCl-KCl is used as an electrolyte system, and a mixture of the gadolinium carbonate and samaric carbonate is added into the electrolyte system; inert metal of tungsten is used as a cathode, graphite is used as an anode, the electrolytic temperature is 750 to 840 DEG C, a cathode sinking method is adopted, the electrode distance is 4cm, the cathode current density is 6.2 to 10 A / cm<2>, the anode current density is 0.5 A / cm<2>, the groove voltage is 4.5 to 7.2V, the electrolysis is carried out for 2 to 5h, and the Al-Gd-Sm alloy is deposited nearby the cathode of a molten salt electrolytic bath. The production process of the method is simple, and the efficiency is high. Compared with a heat reducing method, the method has the advantages that the smelting burning loss is little, and the defects of high smelting cost and large-scale production are overcome. In addition, the creep deformation performance, the mechanical intensity and the corrosion resistant performance of the aluminum gadolinium alloy are changed through adding rare earth elements of gadolinium and samarium.

Description

technical field [0001] The invention relates to a method for preparing rare earth aluminum alloys, in particular to a method for electrolytically preparing an aluminum-gadolinium-samarium master alloy in a molten salt. Background technique [0002] The addition of rare earth metals to aluminum alloys can improve the high temperature performance, corrosion resistance and hot workability of the alloy. This is because the rare earth elements are active and can form stable high-melting point intermetallic compounds with many elements, which are distributed in the grain boundary and between the grains in the form of a network or skeleton; it can also reduce the defects of the alloy such as pinholes, pores, and porosity. It is mainly due to the effect of rare earth degassing, impurity removal and grain refinement. In short, relevant research shows that the addition of rare earths to aluminum can significantly purify, refine, alloy / microalloy (strengthen) the effect, thereby impro...

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Problems solved by technology

The disadvantages are: the composition is not easy to control, the actual yield is unstable when used, and the quality of the final product is not suitable for guarantee; the production process is long, the process is complicated, the energy consumption is high, the alloy composition is easy to segregate, and the production cost is high

However, the preparation cost of rare earth chloride is high, dehydration is difficult and the reactivity is high, and storage and transportation are difficult.

.The fluoride-oxide electrolysis method has the advantages of good storage and transportation of oxides, but compared with the chloride molten salt system, the fluoride-oxide molten salt has a higher melting point, high electrolysis temperature, and strong corrosion of molten salt

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