Manganese aluminum alloy and preparation method thereof

Abstract

The invention discloses a manganese aluminum alloy and a preparation method thereof. The manganese aluminum alloy comprises 55-90% of manganese and the balance of aluminum in percentage by weight. Themethod comprises the following steps: metal aluminum or molten aluminum is added in a container, wherein the temperature of the molten aluminum is 700-800 DEG C; a metal manganese raw material is added in the molten aluminum for furnace covering, pressure measurement and argon introduction to locate in a positive-pressure state in a magnetic induction electric furnace, and a graphite stirring head is used for stirring; the metal aluminum or the molten aluminum is heated above 1000 DEG C by electrifying for fusion, and the temperature is maintained between 1000-1500 DEG C; and after alloying is finished, the temperature is lowered below 850 DEG C, and a furnace cover is opened to take out the manganese aluminum alloy. Compared with a traditional product, manganese and aluminum in the prepared manganese aluminum alloy are fully alloyed, so that the absorptivity and the absorption rate of manganese as an alloy adding element in the molten aluminum in the aluminum smelting process of a manganese element additive are increased, and the environment pollution in the preparation process is reduced.

Description

technical field [0001] The invention relates to the technical field of manganese-aluminum alloy and its preparation, in particular to a manganese-aluminum alloy and its preparation method. Background technique [0002] During the production and processing of aluminum alloy materials (such as aluminum sheets for aviation, aluminum sheets for cans, and aluminum sheets for PS plates, etc.), it is usually necessary to add The metal manganese element makes the metal manganese and aluminum form an aluminum-manganese alloy intermetallic compound with a densely linked network structure, so as to significantly improve the strength of the aluminum material. However, since the melting point of metal manganese is 1246°C, and the temperature control of the melting process of aluminum melt is generally between 740-750°C, in order to quickly dissolve metal manganese into aluminum melt and form an intermetallic compound with aluminum (aluminum-manganese intermetallic compounds), currently ...

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Problems solved by technology

[0003] The first way is to add a calculated amount of manganese additive to the aluminum melt, which is composed of manganese powder crushed by mechanical processing and potassium fluoroaluminate (KAIF 4 , commonly known as PAF) are uniformly mixed by physical methods and pressed into cakes by mechanical pressure (oil pressure, air pressure, etc.). The specific gravity of the cakes is greater than that of molten metal aluminum. In the liquid, due to the fluxing effect of PAF, metal manganese can quickly melt into the aluminum liquid and form an intermetallic compound (alloy) with aluminum, but because the main component of PAF contains fluorine element (F), resulting in Environmental pollution due to volatilization and cleaning (refining) of fluorine element (F)

[0004] The second way is to use the flux potassium fluoroaluminate (KAIF 4 , commonly known as PAF) is replaced by aluminum powder, because the aluminum powder will burn at 740 ° C to generate alumina and generate a large amount of heat simultaneously, the heat generated by the combustion of this aluminum powder can promote the rapid melting of manganese powder into the aluminum melt , and make the metal manganese and aluminum melted into the aluminum melt form an alloy (intermetallic compound), but because the aluminum powder is completely oxidized into alumina after the combustion of the aluminum powder during the whole process, this alumina will partly enter the molten In the aluminum liquid, it has a negative effect on the purification of the aluminum melt. At the same time, due to the high cost of aluminum powder, the completely burned alumina can only be removed as slag in the smelting process, which increases the production cost.

[0009] 1. During the process, element manganese may be oxidized by oxygen in the air to form manganese oxide, which floats on the surface of molten aluminum and affects the absorption rate of metal manganese during the smelting process;

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