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Method for preparing aluminum alloy by virtue of molten salt electrodeoxidation-ingot metallurgy

A molten salt electro-deoxidation and aluminum alloy technology, applied in the field of electrolytic metallurgy, can solve the problems of alloy powder molten salt inclusion, complex process and equipment, large loss of active metal, etc., and achieves reduced element segregation, good development prospects, and uniform composition distribution. Effect

Inactive Publication Date: 2015-03-25
NORTHEASTERN UNIV
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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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  • Method for preparing aluminum alloy by virtue of molten salt electrodeoxidation-ingot metallurgy
  • Method for preparing aluminum alloy by virtue of molten salt electrodeoxidation-ingot metallurgy

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

The invention discloses a method for preparing an aluminum alloy by virtue of molten salt electrodeoxidation-ingot metallurgy, and belongs to the technical field of electrolytic metallurgy. The method comprises the following steps: (1) uniformly mixing metal powder with oxide powder, and performing compression molding; (2) putting graphite serving as an anode and a mixed pressed sheet serving as a cathode into a molten salt electrolyte to perform electrolytic reduction by using a molten salt electrodeoxidation method; (3) heating the molten salt electrolyte to a smelting temperature, and adding an electrolysis product for smelting; and (4) analyzing elementary components of an intermediate alloy, preparing metals required to be added, mixing and heating to melt, refining by adding a refining agent under a vacuum condition, standing, and then casting into the aluminum alloy. The method disclosed by the invention is simple in preparation process, the prepared aluminum alloy is uniform in component distribution, various properties meet requirements, and element segregation is obviously reduced compared with that of a conventional direct reaction 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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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
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