Rare earth aluminum alloy, and method and device for preparing same

Abstract

The invention discloses a rare earth aluminum alloy, and a method and a device for preparing the same. The alloy contains at least one rare earth metal of lanthanum, cerium, praseodymium, neodymium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, lutetium, scandium and yttrium, the content of raw earth is 5 to 98 weight percent, and the balance is aluminum and inevitable impurities. The device for preparing the rare earth aluminum alloy is characterized in that: a) graphite serves as an electrolysis bath, a graphite plate is an anode, a tungsten bar is a cathode and a molybdenum crucible serves as a rare earth aluminum alloy receiver; b) the diameter of the tungsten bar is 30 to 55 mm; and c) the anode of the graphite consists of a plurality of graphite plates. The rare earth aluminum alloy, and the method and the device for preparing the same have the advantages that: the alloy has uniform components, little segregation and low impurity content; technology for preparing the rare earth aluminum alloy through fusion electrolysis can maximally replace a process for preparing single medium-heavy metal through metallothermic reduction, greatly reduce energy consumption and the emission of fluorine-containing tail gas and solid waste residue, improve current efficiency and metal yield and reduce the consumption of auxiliary materials and the energy consumption; and the rare earth aluminum alloys with different rare earth contents can be obtained by controlling different electrolytic temperatures and different cathode current densities.

Description

technical field [0001] The invention relates to the field of rare earth alloy materials, and belongs to rare earth pyrometallurgy, in particular to a rare earth aluminum alloy and its preparation method and device Background technique [0002] At present, aluminum and aluminum alloys are the second largest metal structural materials after steel, and are widely used in construction, energy, transportation, aerospace and other fields. The application and research of rare earth in aluminum and aluminum alloy materials has also been developed rapidly. Various rare earth aluminum alloys such as high-strength rare earth aluminum alloy wire (Al-Mg-Si-RE), heat-resistant rare earth aluminum alloy wire (Al- Zr-RE), building aluminum alloys (Al-Mg-Si-Fe-RE), high-strength aluminum alloys (Al-Zn-Mg-RE, Al-Si-Cu-RE), etc. have been widely used. Rare earth aluminum alloys that are widely used in high-tech materials include Y-Al alloys, Sc-Al alloys, Er-Al alloys, and Nd-Al alloys. [0...

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Problems solved by technology

[0015] We collectively refer to the above methods as industrial aluminum electrolysis, that is, in the process of aluminum electrolysis, rare earth compounds or rare earth metals are directly added to prepare aluminum rare earth master alloys, but this type of method has the following problems: 1) Only rare earths with low rare earth content can be prepared Aluminum alloy; 2) As we all know, a 300KA electrolytic cell has nearly 30 tons of molten aluminum in the cell, and the daily output is more than 2 tons. Using such a scale to prepare aluminum rare earth master alloys will inevitably bring higher production costs and risks, and it is difficult to control the rare earth content in the alloy

Therefore, this type of preparation method has only been used in the preparation of master alloys for electrical aluminum, and is not applicable to other rare earth aluminum master alloys for advanced materials.

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