Aluminum-silicon alloy refining agent and preparation method thereof

Abstract

The invention discloses an aluminum-silicon alloy refining agent and a preparation method thereof. The aluminum-silicon alloy refining agent is prepared from the following raw materials of, by mass, 8parts of KCl, 70 parts of NaCl, 31 parts of NaAlF6, 8 parts of MgCl2, 3 parts of graphite powder, 5 parts of carnallite, 11 parts of phosphorus pentachloride and 6 parts of titanium tetrachloride. The preparation method of the aluminum-silicon alloy refining agent comprises the following steps that (1) the NaCl is heated and dried, so that the water content of NaCl is reduced to 1%; (2) the raw materials of the KCl, the NaAlF6, the MgCl2, the phosphorus pentachloride and the titanium tetrachloride are weighed according to the mass fraction, mixed and stirred; (3) the graphite powder and the carnallite are crushed into powder, and then are added into the mixture obtained in the step (2); and (4), the mixture obtained in the step (3) is pressed into blocks, wherein the density of the blocksis 230 Kg / m<3>. The method of the product is simple and easy to implement, the refining agent produced through the method is used for casting of the aluminum-silicon alloy, an air hole can not be generated in the surface of a casting, the content of the oxide inclusions in the casting is remarkably reduced, and the quality of the casting is greatly improved.

Description

technical field [0001] The invention relates to the technical field of casting auxiliary agents, in particular to an aluminum-silicon alloy refining agent and a preparation method thereof. Background technique [0002] At present, in the casting process of aluminum-silicon alloy castings, the aluminum-silicon alloy is first melted. Because it is melted at normal temperature and pressure, the melt absorbs moisture in the air and oxidizes, which reduces the quality of the melt. Especially after casting, during the solidification process of the melt, the air bubbles in the melt rise, resulting in pores on the surface of the casting and inclusions of oxides in the casting, so that the quality of the casting cannot be guaranteed, or even scrapped. The existing methods to solve these problems are: inert gas refining method, that is, inert gas is injected into the alloy melt during the melting process. Because the inert gas cannot chemically react with aluminum. As the inert gas ...

AI Technical Summary

Problems solved by technology

[0003] In practice, the above methods are not ideal

Difficult to meet product technical standards

There is no refining agent identical with the present invention and the refining agent manufactured by this method is applied in production practice