Al-Ti-B-rare earth(RE) grain refiner and preparation method thereof

Abstract

The invention relates to an Al-Ti-B-RE grain refiner and a preparation method thereof. The Al-Ti-B-RE grain refiner is used for Al-Mg-Si alloy, and is characterized by containing the following components in percentage by weight: 6.9 to 7.9 percent of Ti, 1.31 to 1.75 percent of B and 1.5 to 2.0 percent of mixed RE. The mixed RE is cerium-enriched rare earth. The preparation method of the cerium-enriched rare earth comprises: mixing the raw materials according to a weight part ratio, wherein the mixing time is controlled to be 3 to 4 hours; heating an aluminum ingot in a medium frequency induction furnace to an overhigh temperature of 700 to 750 DEG C; filling a mixed pressed block of potassium fluotitanate and potassium fluoborate and cerium-enriched rare earth into a graphite bell jar; clamping the reversed bell jar by using forceps, and pressing the bell jar into the lower middle part of aluminum melt; raising the furnace temperature to 800 to 850 DEG C, and magnetically stirring for 25 to 30 minutes with the induction furnace; after reaction, taking the graphite bell jar out; standing and keeping the temperature for 20 minutes; forcefully stirring the melt once with an artificial graphite rod every 3 minutes, and stirring for more than five times; treating molten alloy; standing and keeping temperature for 15 to 20 minutes; and performing secondary slagging off.

Description

technical field [0001] The invention relates to a metal refiner and a preparation method thereof. Background technique [0002] With the wide application of aluminum products in industrial production and people's life, especially in the field of high-tech science and technology, more stringent requirements are put forward for its organization and performance in the subsequent processing technology, and the control of its organization and One of the key factors of performance is the fine and uniform as-cast grain structure of melting and casting. As the grain refiner of aluminum alloy, Al-Ti-B master alloy has been maturely used in the production of casting products and continuous casting and rolling products. , and achieved a relatively obvious effect of grain refinement, but there are still certain side effects when refining grains and improving product structure and performance. The combination of existing salts causes inclusions. Because the TiB2 particles in the interme...

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Problems solved by technology

However, there are still some side effects when refining grains and improving product structure and performance, such as the aggregation of boride particles, which causes the local grains of the aluminum alloy to be coarse after solidification, and if Zr and Cr are combined in the aluminum alloy, it can also cause TiB2 particles. Poisoning, leading to obvious attenuation of early refinement effect

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