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Method for preparing aluminum-gadolinium-samarium alloy by fused salt electrolysis

A molten salt electrolysis and alloy technology, applied in the field of non-ferrous metals, can solve the problems of easy segregation of alloy components, long production process, complicated process, etc., and achieve the effect of realizing experimental conditions, simple production process, and easy experimental conditions.

Inactive Publication Date: 2012-05-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for preparing aluminum-gadolinium-samarium alloy by fused salt electrolysis
  • Method for preparing aluminum-gadolinium-samarium alloy by fused salt electrolysis
  • Method for preparing aluminum-gadolinium-samarium alloy by fused salt electrolysis

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: with AlF 3 +NaCl+KCl is the electrolyte system, AlF 3 , NaCl, and KCl mass percentages are 10%, 40%, and 50% respectively, and then press AlF 3 Add 10% of the mass to anhydrous Sm 2 o 3 and Gd 2 o 3 mixed powder, the electrolysis temperature is 740°C, and the cathode current density is 6.2A / cm 2 , the cell voltage is 4.5-4.8V, after 2 hours of electrolysis, Al-Gd-Sm ternary alloy is deposited near the cathode of the molten salt electrolytic cell, and the contents of aluminum, gadolinium and samarium are respectively: 81.4%, 9.0%, 9.6% . Its current efficiency is 70.5%.

Embodiment 2

[0020] Embodiment 2: with AlF 3 +NaCl+KCl is the electrolyte system, AlF 3 , NaCl, and KCl mass percentages are 9%, 41%, and 50% respectively, and then press AlF 3 Add 20% of the mass to anhydrous Sm 2 o 3 and Gd 2 o 3 The mixed powder, with the inert metal molybdenum (Mo) as the cathode, graphite as the anode, the electrolysis temperature is 790 ° C, and the cathode current density is 6.2A / cm 2 , anode current density 0.5A / cm 2 , the cell voltage is 4.4-4.7V, after 1.8h of electrolysis, Al-Gd-Sm ternary alloy is deposited near the cathode of the molten salt electrolytic cell, and the contents of aluminum, gadolinium and samarium are respectively: 75.1%, 20.8%, 4.1% %. Its current efficiency is 65.7%.

Embodiment 3

[0021] Embodiment 3: with AlF 3 +NaCl+KCl is the electrolyte system, AlF 3, NaCl, and KCl mass percentages are 11.1%, 38.9%, and 50% respectively, and then press AlF 3 Add 10% of the mass to anhydrous Sm 2 o 3 and Gd 2 o 3 mixed powder, the electrolysis temperature is 640°C, and the cathode current density is 6.2A / cm 2 , anode current density 0.5A / cm 2 , the cell voltage is 4.6-5.0V, after 2 hours of electrolysis, Al-Gd-Sm ternary alloy is deposited near the cathode of the molten salt electrolytic cell, and the contents of aluminum, gadolinium and samarium are respectively: 90.8%, 5.6%, 3.6% . Its current efficiency is 30.5%.

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Abstract

The invention relates to a method for preparing an aluminum-gadolinium-samarium alloy by fused salt electrolysis, which comprises the following steps: using AlF3+NaCl+KCl as a fused salt electrolyte system, wherein the percentage by mass of the AlF3 is 10-12%, the percentage by mass of the NaCl is 36-40%, and the percentage by mass of the KCl is 47-50%; adding anhydrous Sm2O3 and Gd2O3 mixed powder according to 10-20% of the mass of the AlF3; porphyrizing in a mortar, and uniformly mixing; using inert metal molybdenum as the cathode and graphite as the anode to carry out electrolysis, whereinthe electrolysis temperature is 640-840 DEG C, a submerged cathode process is adopted, the anode-cathode distance is 4 cm, the cathode current density is 3.1-9.3 A / cm<2>, the anode current density is0.5 A / cm<2>, the tank voltage is 3.9-5.1 V, and the electrolysis time is 1.8-3 hours; and finally, depositing the Al-Gd-Sm ternary alloy in the vicinity of the cathode of the fused salt electrolysis tank. By adding the AlF3 used as the electrolyte into the low eutectic NaCl-KCl fused salt, the electrolysis can be implemented at low temperature. By using AlF3+NaCl+KCl as the electrolyte fluorination and chlorination system, the invention combines the advantages of the chloride fused salt electrolysis method and the fluoride-oxide fused salt electrolysis method in the fused salt electrolysis methods.

Description

technical field [0001] The invention relates to a method for preparing a rare earth aluminum alloy, in particular to a method for electrolytically preparing an aluminum-gadolinium-samarium alloy in a molten salt, which belongs to the technical field of nonferrous metals. Background technique [0002] The addition of rare earth metals to the alloy can improve the thermal deformation, corrosion resistance, welding and other properties of the alloy, and can reduce the damage of impurities; rare earth elements can also improve the structure and performance of aluminum alloys to varying degrees. These advantages of rare earth alloys make them widely used in aerospace, automobiles, notebook computers, military, nuclear energy and other fields, and their usage tends to increase significantly. [0003] Al-Sm(Gd) alloy has specific superior nuclear properties. The thermal neutron protection material commonly used in today's nuclear reactors is aluminum-boron composite material, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 韩伟张密林于晓峰李梅景晓燕魏树权
Owner HARBIN ENG UNIV
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