A kind of sodium-free refining agent for aluminum alloy containing lanthanum, erbium and zirconium

Abstract

The invention discloses a sodium-free refining agent for aluminum alloy containing lanthanum, erbium and zirconium, which includes material A and material B, wherein the material A includes the following raw materials in parts by weight: 50-60 parts of KCl, 20-25 parts of K2CO3, 10-25 parts of LiCl 15 parts, 30 to 35 parts of AlF, 10 to 12 parts of potassium fluoroaluminate, 25 to 10 parts of CaF, 5 to 10 parts of carbon powder, 15 to 25 parts of light calcium carbonate, and 8 parts of CaO2; the B material is composed of C2Cl6, The composition of TiO2 and metal is 5:1.5-2:1-1.5 by weight, and the metal is a mixed metal including Mg, La, Er and Zr; material A and material B are used together, and the weight ratio is 2-3:1. Using the refining agent of the present invention does not introduce impurity sodium in the refining process, and adds Mg, La, Er and Zr elements to modify and refine the aluminum alloy structure and improve the mechanical properties of the alloy.

Description

technical field [0001] The invention relates to the field of smelting and processing of aluminum alloys, in particular to a sodium-free refining agent for aluminum alloys containing lanthanum, erbium and zirconium. Background technique [0002] There are mainly two types of gas impurities and solid impurities in the aluminum alloy melt. Gas impurities include N 2 、H 2 , O 2 three gaseous elements, of which H 2 It accounts for more than 80% of the impurity gas contained. In aluminum alloys, gas elements mainly exist in the form of needle-like bubbles, gas inclusions, hydrides, and solid compounds in the form of atoms or molecules between alloy atoms or in lattices and gaps, forming defects such as pores and pores. It is often the root cause of alloy defects and fractures, which seriously affects the performance and quality of aluminum alloys, especially the tensile strength. Solid impurities mainly include oxides, nitrides, sulfides, chlorides, fluorides, silicates, etc...

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 application publication number is CN Patent No. 103255305 A discloses a high-efficiency refining agent for aluminum alloys. The components are: NaCl: 20-45%, KCl: 25-30%, CaF 2 :1-5%, Na 2 SO 4 :1-5%, Na 3 AlF 6 : 15-43%, the use of this sodium salt will introduce sodium into aluminum-magnesium, aluminum-copper, aluminum-lithium alloys, resulting in "sodium embrittlement" phenomenon