Aluminum alloy sodium-free refining agent and application thereof

Abstract

The invention provides an aluminum alloy sodium-free refining agent and belongs to the technical field of casting of aluminum alloys. The sodium-free refining agent comprises the following raw materials in parts by weight: 30-35 parts of K2CO3, 10-12 parts of potassium fluoroaluminate, 5-10 parts of CaF2, 12-18 parts of LiCl, 3-5 parts of calcium oxide, 30-35 parts of BalF3, 5-10 parts of K2SiF6, 10-15 parts of C6Cl6, 5-10 parts of TiO2 and 3-8 parts of CaCl. The aluminum alloy sodium-free refining agent is free of impurity sodium; meanwhile, rare-earth metals are added into the sodium-free refining agent; the rare-earth metals have high chemical affinity with impurity elements such as H2 and S and the like; the rare-earth metals and various impurity elements form compounds; the influence of harmful impurities can be eliminated; the rare-earth metals have the functions of modifying and refining the aluminum alloy structure; the dendrite spacing of the aluminum alloy is effectively reduced; the as-cast grains are refined; the mechanical performance of the alloy is improved; meanwhile, the smelting temperature of the aluminum alloy is maintained at 710-730 DEG C in the process of using the aluminum alloy sodium-free refining agent, so that the effect of removing impurity elements such as H2 and S and the like is more significant.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a sodium-free refining agent for aluminum alloy and its application. Background technique [0002] During the smelting process of aluminum alloy, its performance may be reduced or even deteriorated due to improper handling of the melt, resulting in batches of waste products in castings. According to statistical analysis, the waste products (such as leakage, pores, slag inclusions, etc.) produced due to poor control of the smelting process are mainly caused by the gas, oxidation slag inclusions, and flux slag inclusions in the alloy liquid. Therefore, the quality of aluminum alloy melt has an important influence on the structure and performance of aluminum castings, and improving the quality of alloy melt is an important link to improve the quality of castings. The main task of aluminum alloy melt treatment is to improve the purity and metamorphic effec...

AI Technical Summary

Problems solved by technology

[0004] At present, the refining agents disclosed in my country generally contain one or more of sodium salts such as sodium chloride, sodium fluoroaluminate, sodium carbonate, sodium sulfate, sodium fluoride, and sodium fluorosilicate. For example, the authorized announcement number is CN103014397B The patent disclosed a preparation method of refining agent for smelting aluminum alloy profiles doped with diatomite, the components are potassium chloride 7-9, plant ash 4-6, diatomite 2-3, quartz sand nano powder 2-4, bamboo charcoal powder 3-5, calcium fluoride 4-6, sodium nitrate 3-5, graphite powder 5-8, sodium fluorosilicate 8-10, sodium sulfate 3-5, aluminum chloride 5-8, Potassium carbonate 3-5, attapulgite 8-10, NaBF45-8, sodium chloride 3-5, potassium feldspar powder 5-8, Na2TiF68-10, NaF5-8, the use of this sodium salt will be , Al-Cu, Al-Li alloys are introduced with sodium, resulting in "sodium embrittlement" phenomenon