Al-V-B refining agent for cast aluminum-silicon alloy, preparation method and application thereof

Abstract

The invention discloses an Al-V-B refining agent for cast aluminum-silicon alloy, a preparation method and application thereof. The Al-V-B refining agent comprises the following chemical elements of,in percentage by mass, 80.0%-95.8% of aluminum, 2.1%-10.0% of vanadium and 2.1%-10.0% of boron; the phase composition of the refining agent is composed of an aluminum solid solution alpha-Al acting asa matrix and particle particles with the particle size of 2-100 microns. The phase of each particle particle comprises a VAl3 phase, a VB2 phase and an AlB2 phase at the same time. In the casting aluminum-silicon alloy application, the grain size of the alpha-Al in the cast aluminum-silicon alloy is refined to be 220 microns or below. The preparation method of the refining agent adopts a villiaumite method and comprises the following steps of weighing raw materials; and smelting the Al-V-B alloy. According to the Al-V-B refining agent, the refining effect can reach 184 microns, and the requirement of the aluminum industry approved standard of less than or equal to 220 microns are met; and the preparation method is simple and convenient, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a refining agent for casting aluminum-silicon alloy, its preparation method and application, in particular to an Al-V-B refining agent for casting aluminum-silicon alloy, its preparation method and application, and is applied in the technical field of aluminum alloy smelting . Background technique [0002] Cast aluminum-silicon alloys are widely used in food packaging, transportation and construction materials due to their good mechanical properties and casting properties. Refining the grains of the alloy can obtain a dense alloy structure, and at the same time reduce the tendency of hot cracking and segregation of the casting, and reduce the porosity, thereby improving the overall performance of the alloy. The most commonly used and effective refinement method is to add a refiner, among which Al-5Ti-B refiner has been widely used. However, this refiner is not suitable for refining aluminum-silicon alloys with a Si content gr...

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Problems solved by technology

[0005] 1. The recognized standard of the aluminum industry is ≤220μm (G.P.Jones, J.Pearson, Factors affecting the Grain-Refinement of aluminum using titanium and boron additives, Metallurgical Transactions B, 7B (1976), 223-224.), the Al prepared by this technology After -2V-2B refiner is added to Al-7Si alloy, the grain size of α-Al in the sample is reduced to 450μm, which is more than 2 times of the standard, which does not meet the application requirements

[0006] 2. There are three temperature-changing operations in the process of preparing the Al-V-B refiner in this prior art, and two heating devices, an electric arc melting furnace and a resistance furnace, are required, and the time required for preparing the refiner at the same time is 4 hours. Longer and more cumbersome to operate

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