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A method for preparing aluminum alloy by molten salt electrodeoxidation-ingot metallurgy

A molten salt electrodeoxidation and aluminum alloy technology, applied in the field of electrolytic metallurgy, can solve problems such as alloy powder molten salt inclusions, complex processes and equipment, and large loss of active metals, and achieve reduced element segregation, good development prospects, and uniform distribution of components Effect

Inactive Publication Date: 2016-08-24
NORTHEASTERN UNIV LIAONING
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  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problems of large loss of active metals, very complicated process and equipment in the traditional method of preparing aluminum alloys, long deoxidation time in the molten salt electro-deoxidation method, and inclusion of molten salt in the alloy powder, the present invention provides a molten salt electro-deoxidation method. The method for preparing aluminum alloy by deoxidation-ingot metallurgy, by mixing and pressing a metal powder and oxide powder, directly as the cathode without sintering, graphite as the anode, using LiCl-LiF or KCl-LiCl or CaCl 2 - LiCl is used as a molten salt electrolyte to prepare alloy powder by electrolysis. Under the conditions of small metal loss and short deoxidation time, an aluminum alloy with uniform composition and high purity can be prepared

Method used

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  • A method for preparing aluminum alloy by molten salt electrodeoxidation-ingot metallurgy
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Examples

Experimental program
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Effect test

Embodiment 1

[0041] Preparation of 2297 Al-Li alloy:

[0042] Al powder, Cu powder and Li 2 The O powder is mixed evenly, and then compressed to obtain a mixed tablet; by weight percentage, the Al powder accounts for 90%, the Cu powder accounts for 5%, and the Li powder accounts for 5%. 2 O powder accounts for 5%;

[0043] Graphite is used as the anode, the mixed pressed tablet is used as the cathode, the cathode and the anode are placed in the molten salt electrolyte, and the electrolytic reduction is carried out by the molten salt electro-deoxidation method; the voltage during the electrolytic reduction is lower than the decomposition voltage of the molten salt electrolyte, and the electrolysis time is 5h After the electrolytic reduction is completed, the electrolytic product is separated from the molten salt electrolyte under the protection of an inert gas, and the temperature of the electrolytic product is lowered to normal temperature before being taken out; the molten salt electroly...

Embodiment 2

[0048] Preparation of 2397 Al-Li alloy:

[0049] Preparation of mixed tablets: Al powder, Cu powder and Li 2 The O powder is mixed evenly, and then compressed to obtain a mixed tablet; by weight percentage, the Al powder accounts for 70%, the Cu powder accounts for 10%, and the Li powder accounts for 10%. 2 O powder accounts for 20%;

[0050] Graphite is used as the anode, the mixed pressed tablet is used as the cathode, the cathode and the anode are placed in the molten salt electrolyte, and the electrolytic reduction is carried out by the molten salt electro-deoxidation method; the voltage during the electrolytic reduction is lower than the decomposition voltage of the molten salt electrolyte, and the electrolysis time is 8h After the electrolytic reduction is completed, the electrolytic product is separated from the molten salt electrolyte under the protection of an inert gas, and the temperature of the electrolytic product is lowered to normal temperature before being tak...

Embodiment 3

[0055] Preparation of 2197 Al-Li alloy:

[0056] Preparation of mixed tablets: Al powder, Cu powder and Li 2 The O powder is mixed evenly, and then compressed to obtain a mixed tablet; by weight percentage, the Al powder accounts for 80%, the Cu powder accounts for 8%, and the Li powder accounts for 8%. 2 O powder accounts for 12%;

[0057] Graphite is used as the anode, the mixed pressed tablet is used as the cathode, the cathode and the anode are placed in the molten salt electrolyte, and the electrolytic reduction is carried out by the molten salt electro-deoxidation method; the voltage during the electrolytic reduction is lower than the decomposition voltage of the molten salt electrolyte, and the electrolysis time is 11h , after the electrolytic reduction is completed, the electrolysis product is separated from the molten salt electrolyte under the protection of an inert gas, and the temperature of the electrolysis product is lowered to normal temperature and then taken ...

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Abstract

A method for preparing aluminum alloy by molten salt electrodeoxidation-ingot metallurgy, which belongs to the technical field of electrolytic metallurgy. It is carried out according to the following steps: (1) Mix metal powder and oxide powder evenly and press them into shape; (2) Use graphite as an anode, Use the mixed tablet as the cathode, place it in the molten salt electrolyte, and use the molten salt electrodeoxidation method to perform electrolytic reduction; (3) Heat the molten salt electrolyte to the melting temperature, and put the electrolytic product into the smelting; (4) Analyze the elements of the intermediate alloy Ingredients: prepare the metal to be added, mix, heat and melt, add refining agent under vacuum conditions for refining, and then cast into aluminum alloy after standing. The preparation process of the invention is simple, the components of the prepared aluminum alloy are evenly distributed, various properties meet the requirements, and element segregation is significantly reduced compared with the traditional counter-doping method.

Description

technical field [0001] The invention belongs to the technical field of electrolytic metallurgy, and in particular relates to a method for preparing aluminum alloy by molten salt electric deoxidation-ingot metallurgy. Background technique [0002] Aluminum-lithium alloy has a series of advantages such as light specific gravity, high strength and elastic modulus, corrosion resistance, high temperature and ultra-low temperature resistance, and high specific rigidity, so it is widely used in aerospace and defense space and other fields; aluminum-magnesium alloy has light weight, heat dissipation Good performance, strong pressure resistance and other advantages, widely used in construction, packaging, ships and other fields. [0003] The traditional production of aluminum alloys mainly adopts the method of blending. This method is to melt aluminum and high-purity metals together according to a certain ratio and cast them into aluminum alloys; the recovery rate of active metals in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/00C25C3/36
Inventor 高炳亮王兆文祝浩石忠宁胡宪伟于江玉
Owner NORTHEASTERN UNIV LIAONING
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