Preparation method of rare earth aluminum titanium boron grain refiner

Abstract

The invention discloses a preparation method of a rare earth aluminum-titanium-boron grain refiner. The raw materials are weighed, and the raw materials include: aluminum ingots, potassium fluorotitanate, potassium fluoroborate, sodium chloride, potassium chloride, cryolite, and Rare earth oxides or rare earth fluorides and metal calcium; after the raw materials are heated and melted aluminum ingots, the mixed salt of potassium fluorotitanate and potassium fluoroborate is added to react; after stirring until the melt reaction is complete, keep warm and remove slag, add sodium chloride, chlorine Potassium chloride, cryolite, and rare earth oxides or rare earth fluorides and calcium metal are reacted; stirring until the melt is completely reacted, refining, slag removal after heat preservation, and casting to obtain rare earth aluminum titanium boron grain refiner; rare earth aluminum The titanium-boron grain refiner is calculated by weight percentage, including: 1.0-10.0% of titanium, 0.5-5.0% of boron, 0.1-5.0% of rare earth, and the balance is aluminum. The invention can reduce the energy consumption in the preparation process of the rare earth aluminum titanium boron alloy, reduce the cost, and improve the TiAl in the refiner at the same time 3 、TiB 2 The size, shape and distribution of particles can be used to obtain a grain refiner with higher refinement performance.

Description

technical field [0001] The invention belongs to the application technology of aluminum alloys, and in particular relates to a preparation method of a rare earth aluminum titanium boron grain refiner. Background technique [0002] Due to its light weight, excellent cost performance and good comprehensive performance, aluminum alloys have been widely used in the fields of machinery, automobiles, aviation and military industries. To obtain aluminum alloys with excellent comprehensive properties, grain refinement is one of the most important means. The yield strength of the material will increase as the grain size decreases. In addition, the fine equiaxed grain structure can improve the toughness of the material and ensure its good casting performance, surface finish, and excellent processing performance. Therefore, the fine and uniform equiaxed grain structure is the ideal as-cast structure. [0003] The methods to obtain the ideal as-cast structure are divided into two categ...

AI Technical Summary

Problems solved by technology

However, the most commonly used grain refiner is Al-Ti-B refiner, which has some problems: TiB 2 Particles are easy to aggregate and precipitate and lose the ability to refine; B is prone to poisoning reactions with Cr and Zr and loses the ability to refine; TiB in commonly used refiners 2 Particles, TiAl 3 phase, less than 1% can become effective heterogeneous nucleation cores, and the refinement ability needs to be improved

The first method has severe rare earth metal burning loss and low rare earth yield. The second method has high process energy consumption and high cost due to the long process, and the above two methods are harmful to TiAl in aluminum titanium boron. 3 、TiB 2 The improvement effect of particle shape and size is not obvious