Preparation method for aluminum-silicon intermediate alloy

Abstract

The invention discloses a preparation method for aluminum-silicon intermediate alloy. The preparation method comprises the steps that (1) industrial silicon particles are wrapped in aluminum foil and placed at the furnace bottom of a smelting furnace; (2) according to the matching ratio of the aluminum-silicon intermediate alloy, aluminum ingots are added into a furnace chamber of the smelting furnace and placed on the industrial silicon particles wrapped in the aluminum foil; (3) heating smelting is conducted, and when the furnace burden is softened and sinks, a layer of flux powder is scattered on the surface of molten liquid for covering; (4) after the furnace burden is molten completely, melt is stirred; and (5) after the melt is fully stirred, casting molding is conducted. Thus, it can be seen that in the scheme, the aluminum foil is used for wrapping the industrial silicon particles, with temperature increasing, the aluminum foil and the aluminum ingots begin to melt, and the industrial silicon particles are covered rapidly, thereby being protected against oxidation. In this way, a layer of silicon dioxide can be effectively prevented from forming on the surfaces of the industrial silicon particles, and the smelting temperature and the energy consumption are lowered. In addition, due to drop of the smelting temperature, aluminum-silicon intermediate alloy grains can be refined, and thus the grain size of follow-up casting ingots is ensured.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy melting and casting, in particular to a method for preparing an aluminum-silicon intermediate alloy. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in the industry. It is widely used in aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. Aluminum alloy can be divided into various types according to the content of its components. Among them, aluminum-silicon alloy is a kind of large amount. In the process of manufacturing aluminum-silicon alloy, due to the high melting point of silicon, it is not easy to melt into the alloy, so it needs to be made into an aluminum-silicon intermediate alloy with a relatively low melting point to facilitate Added to aluminum silicon alloy. [0003] In the prior art, when making aluminum-silicon master alloy, silicon element and aluminum alloy are smelted together at h...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, when making aluminum-silicon master alloy, silicon element and aluminum alloy are smelted together at high temperature. During this process, silicon element contacts with oxygen to form a layer on the surface of silicon element whose melting point is higher than that of silicon element SiO2 affects the melting of simple silicon. The current solution to this problem is high-temperature smelting, but this will increase energy consumption and cause damage to furnaces and other equipment. At the same time, the master alloy obtained by high-temperature smelting has coarse grains. , has a certain influence on the subsequent ingot grain size

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