Al-Ti-B refining agent and preparing method thereof

Abstract

The invention discloses an Al-Ti-B refining agent and a preparing method thereof, and belongs to the technical field of refining agents. The Al-Ti-B refining agent comprises components including, by mass percent, 8.0%-12.0% of Ti, 3.0%-5.0% of B and the balance Al. The Ti / B molar ratio is equal to 1 / 2. Phase compositions include alpha-Al and TiB2. According to the requirements, H3BO3, TiO2, aluminum powder and an aluminum ingot are weighed; according to the molar ratio of components of the refining agent, Ti / B=1 / 4, and Ti / TiO2=2 / 3; the purity of the aluminum ingot is 99.9%; TiO2 and H3BO3 areevenly mixed, and heating is conducted at 300 DEG C for 2 h; the heated powder and the heated aluminum powder are mixed to be arranged in a die and are pressed into blocks; the aluminum ingot is heated and melted and is covered with cryolite; and melt is subjected to temperature rise and pressed into the blocks, stirring is conducted for reaction, pressing of C2Cl6 is conducted for refining, and slagging-off and casting are conducted. The size of TiB2 prepared through low-cost raw materials is smaller than 1 micron.

Description

technical field [0001] The invention belongs to the technical field of refiners, in particular to a method for preparing a low-cost refiner. Background technique [0002] At present, the refining agent widely used in the aluminum industry is Al-Ti-B intermediate alloy wire rod. Due to the backward production conditions and technical level, there is still a certain gap between the product and imported products, mainly reflected in the low B content and poor purity. The size, shape and distribution of the two phases are not up to standard. At the same time, most Al-Ti-B refiners contain TiAl 3 phase, which may contaminate some elements in some alloys. At present, a large number of Al-Ti-B master alloys are prepared industrially through the fluoride salt reaction method. The typical production process is: adding K to the aluminum melt at 750-850°C 2 TiF 6 and KBF 4 , through mechanical stirring to make it fully react to prepare Al-Ti-B refiner. The structure of Al-Ti-B ma...

AI Technical Summary

Problems solved by technology

The structure of Al-Ti-B master alloy prepared by fluoride salt reaction method contains TiAl 3 phase, TiB in tissue 2 Most of the particles exist in the form of agglomerates, and the particles in the agglomerates stick together, the refinement efficiency is low, and serious pollution problems occur at the same time

In order to prepare an efficient Al-Ti-B refiner, various methods have been tried at home and abroad, such as oxide method, self-propagating high-temperature synthesis method, etc., but there are mainly disadvantages such as low preparation efficiency and high preparation cost.

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