Express-melting silicon additive and preparation method thereof

Abstract

The invention relates a express-melting silicon additive and a preparation method thereof; the additive is characterized in that the express-melting silicon additive comprises the following components by weight percent: 0.1-12% of fusing assistant, 0.1-8% of modifier, 0-6% of binder and the balance silicon briquets; wherein, the fusing assistant is one or more of potassium hexafluoroaluminate, potassium fluoroaluminate, potassium fluorosilicate and sodium fluorosilicate, the modifier is one or more of titanium dioxide, hexachloroethane, sodium fluoride and sodium chloride, the binder is one or more of kaolin, refractory clay, talcum powder and sodium silicate and the grain size of silicon briquets is 20-80mm. The preparation method comprises the following steps: adopting fusing assistant, modifier, binder and silicon briquets as raw materials, placing the raw materials according to the weight percent of the chemical components in a high speed mixer to stir evenly, taking out the obtained mixture after stirring to air-dry, then transferring the dried mixture to a sintering reaction furnace, injecting steam, heating and pressurizing, finally taking the mixture out, cooling to the room temperature and obtaining the express-melting silicon additive.

Description

technical field [0001] The invention relates to material science and casting technology, and in particular provides a novel fast-melting silicon additive for aluminum alloy preparation and processing industry. The invention also relates to the preparation method and application of the additive. Background technique [0002] In aluminum alloys, silicon is the most commonly used alloying element. In the production of silicon-containing aluminum alloys, there are two main methods of adding silicon in the past and now: [0003] (1) Directly add crystalline silicon, that is, lay crystalline silicon on the bottom of the furnace first, then lay aluminum ingots on it, ignite and heat up, and melt. [0004] (2) Use an aluminum-silicon master alloy. [0005] The biggest advantage of adopting the first method is low cost, but there are always the following problems: [0006] (1) The melting time of silicon is long, the absorption rate is unstable, it is difficult to accurately cont...

AI Technical Summary

Problems solved by technology

[0006] (1) The melting time of silicon is long, the absorption rate is unstable, it is difficult to accurately control the target composition, and a second supplementary adjustment is required;

[0007] (2) The crystalline silicon cannot be completely melted at the general melting temperature, and the aluminum liquid wraps the incompletely melted tiny crystalline silicon, forming silicon inclusions, which seriously affects the quality of the aluminum liquid;

[0012] (3) Higher cost

As a new type of silicon-adding process, fast-melting silicon additives are not paid enough attention by scientific research institutions and manufacturers in my country.

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