A kind of preparation method of strontium aluminum alloy with high strontium content

Abstract

The invention discloses a preparation method of a strontium aluminum alloy with a high strontium content, and belongs to the technical field of preparation of alloy materials. The preparation method specifically comprises the following steps: firstly, an aluminum block is preheated; then, under inert gas shielding, a strontium block is heated for melting to obtain strontium solution; a covering agent is added in the surface of the strontium solution; the strontium solution keeps the temperature; then, under inert gas shielding, the preheated aluminum block is pressed in the strontium solution for totally melting; the mass ratio of the pressed aluminum block to the strontium solution is 1: 14-1: 0.9; then, a refining agent is added for degassing, stirring and smelting to obtain strontium aluminum alloy liquid; and finally, under inert gas shielding, the strontium aluminum alloy liquid is heated for keeping the temperature at 700-900 DEG C, and is cast to obtain the strontium aluminum alloy. The strontium aluminum alloy, prepared by adding the preheated aluminum block in the strontium solution, is uniform in components, the content of effective component-strontium reaches 47-93%, and the melting point is only 580 DEG C, so that the production energy consumption of users can be reduced; and the strontium aluminum alloy is an excellent high-density modifying agent for casting an aluminum alloy.

Description

Technical field [0001] The invention belongs to the technical field of alloy material preparation. Specifically, the invention relates to a preparation method of strontium aluminum alloy. Background technique [0002] Cast aluminum-silicon alloy has the advantages of low density, high strength, wear resistance, good heat resistance, and low thermal expansion coefficient, so it is the most widely used and largest output type of alloy among cast aluminum alloys. However, with the increase of silicon content in aluminum-silicon alloys, a large amount of needle-like eutectic silicon appears in the structure, and even thick large polygonal bulk primary silicon appears, which severely splits the matrix and significantly reduces the mechanical properties of the alloy, especially the plasticity. , The cutting performance deteriorates. Modification is a process of changing the morphology and size of the crystalline silicon phase. However, when the aluminum-silicon alloy with a silicon co...

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Problems solved by technology

However, the melting point of aluminum-strontium alloys with 20% or less used in enterprises is as high as 800 ° C, which will not only increase the energy consumption of enterprises, but also increase the cost of enterprises using aluminum-strontium alloy modifiers due to the low content of strontium in the active ingredient.