Preparation method of Al-Ti-B-C quaternary grain refiner

Abstract

The invention discloses a preparation method of an Al-Ti-B-C quaternary grain refiner. The preparation method comprises the following steps: according to generation weigh percentage of 1.00-12.00% of Ti, 1.00-4.00% of B, 0.25-1.00% of C and the balance of Al, uniformly mixing sponge titanium powder and boron carbide powder; warming and melting commercially pure aluminum; pressing a mixture of sponge titanium powder and boron carbide powder into molten aluminum; introducing continuous ultrasonic treatment on upper portion of the molten aluminum; and naturally cooling molten aluminum to obtain the Al-Ti-B-C quaternary grain refiner. The preparation method provided by the invention can prevent toxic fluoride gases discharging in traditional preparation reactions, reduce reaction temperature, reduce oxidative damages of molten aluminum, quicken reaction between boron carbide and solute titanium, greatly shorten reaction preparation time, improve a distribution state of a middle phase of the grain refiner, and reduce refining response time; grain size of commercially pure aluminum in cast condition of prepared materials provided by the invention is less than 150 microns.

Description

technical field [0001] The invention relates to a preparation method of a grain refiner in the field of metal materials, in particular to a preparation method of an Al-Ti-BC quaternary grain refiner. Background technique [0002] Al-Ti-B and Al-Ti-C master alloys are excellent grain refiners for aluminum alloys, especially Al-Ti-B master alloys have been widely used in actual industrial production. The main reason for its grain refinement is the excellent nucleation substrate TiB in the refiner. 2 or TiC, and the excess solute Ti has a significant inhibitory effect on the grain growth of Al. However, TiB in Al-Ti-B master alloy 2 Particles are easy to agglomerate, which leads to some quality problems, such as: pinhole defects in aluminum foil and strip defects in anodized sheets; in addition, elements such as Zr, Cr, and Si can also cause TiB 2 The surface is "poisoned", so that the thinning performance declines rapidly. The TiC particles in the Al-Ti-C master alloy are ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies and defects of the existing above-mentioned preparation technology of Al-Ti-B-C quaternary grain refiner, use boron carbide and sponge titanium instead of toxic fluoride as reaction raw materials, and avoid harmful waste residues in traditional processes pollution and treatment problems, and with the help of high-energy ultrasonic vibration technology, increase the wettability between aluminum melt and boron carbide, reduce the reaction temperature, shorten the preparation time of refiner, and improve the distribution of nucleation substrate particles, thus providing a process Simple, low production cost, non-polluting preparation method

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