A kind of aluminum zirconium carbon rare earth refiner and preparation method thereof

Abstract

The invention discloses an Al-Zr-C-Re refiner and a preparation method thereof. The Al-Zr-C-Re refiner is prepared from components in percentage by mass as follows: 4.5%-5.5% of Zr, 0.8%-1.2% of C, 0.1%-0.5% of Re and the balance of Al and inevitable impurities. The preparation method of the Al-Zr-C-Re refiner comprises the steps as follows: mixing titanium powder and carbon powder, melting pure aluminum ingots, preparing an Al-Zr-C alloy liquid, adding Re, and performing casting or continuous casting and rolling to form the Al-Zr-C-Re refiner. The Al-Zr-C-Re refiner has the advantages of uniform ZrC particle distribution, high grain refinement capacity and high cleanliness, a magnesium alloy can obtain tinier and more uniform grain structure, the production requirement for deeply processed magnesium alloy products with high cleanliness, high brightness and high precision can be met, and the Al-Zr-C-Re refiner has broad market application prospects.

Description

technical field [0001] The invention belongs to the technical field of refining agents, and in particular relates to an aluminum-zirconium-carbon rare earth refining agent and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in industrial applications. It has the advantages of low density, high specific strength and specific stiffness, good damping and shock absorption, and good electromagnetic shielding effect. It is used in automobiles, motorcycles, electronic information, rail transit, Aerospace and other fields have great application potential. However, the absolute strength of most magnesium alloys is still low. Secondly, magnesium alloys have a close-packed hexagonal crystal structure, and their plastic deformation ability at room temperature is poor, which limits the production and application of deformed magnesium alloy strips, pipes, profiles and forgings. . Grain refinement is an effec...

AI Technical Summary

Problems solved by technology

However, in this preparation method, due to the large number and small size of ZrC particles in the alloy liquid, the particles have a strong affinity, and there is a non-equilibrium solidification characteristic in the solidification process of the alloy liquid, which eventually leads to AlZrC There is serious segregation and agglomeration of ZrC particles in the alloy, and the segregation and agglomeration of ZrC particles will not only reduce the grain refinement ability of the grain refiner, accelerate the decline of the grain refinement ability, but also cause the surface of magnesium alloy deep processing products to appear Trachoma, pinhole and other defects

In addition, due to the high temperature and violent aluminothermic reaction of this method, a large amount of slag such as hydrogen and alumina will be generated, which will not only cause serious environmental pollution, but also increase the non-metallic inclusions such as hydrogen and alumina in the aluminum-zirconium-carbon alloy. And the content of metal impurity elements such as Fe, Si, etc. will reduce the cleanliness of the grain refiner, and will eventually affect the cleanliness of the magnesium alloy using the grain refiner, which cannot meet the requirements of high cleanliness, high brightness, and high precision. The production needs of magnesium alloy deep processing products