Preparation Technology of Al-Strontium Alloy Modifier

Abstract

The invention discloses a preparation technique of an aluminum-strontium alloy modifier, which comprises the following steps: proportioning, smelting, aluminum-silicon melt purification, argon protection, strontium-addition alloying, refining and standing. By using the aluminum-silicon alloy instead of the electrolytic aluminum in the traditional technique, the preparation technique can lower the melting temperature, lowers the smelting temperature of the aluminum-strontium alloy by 100 DEG C or so, lowers the alloying temperature, and can lower the smelting temperature to 750-800 DEG C during production, which is greatly lower than the smelting temperature 830-900 DEG C in the aluminum-strontium two-element alloy production process. The lower smelting temperature can reduce the high-temperature oxidation loss of strontium, thereby lowering the production cost of the modifier; and the modification properties of the aluminum-strontium alloy are not influenced.

Description

technical field [0001] The invention belongs to the technical field of alloy metal materials. Specifically, the invention relates to a preparation process of an aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloys. 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 a type of alloy with the widest application range and the largest output among cast aluminum alloys. However, with the increase of silicon content in aluminum-silicon alloys, a large amount of acicular eutectic silicon appears in the structure, and even coarse multi-angle block primary silicon appears, which severely splits the matrix and significantly reduces the mechanical properties of the alloy, especially the plastic properties. Machinability deteriorates. Therefore, casting aluminum-silicon alloys usually use modification treatment to chang...

AI Technical Summary

Problems solved by technology

Due to the high melting point of aluminum-strontium alloy, the temperature for producing aluminum-strontium alloy by infiltration method is as high as 900°C, and the burning loss of strontium is serious, and the loss ratio is as high as 20% to 35%.

Strontium metal is a very active alkaline earth metal. Its chemical activity is between that of calcium and barium. The production of strontium metal is mostly by vacuum thermal reduction method, with complex equipment, strict process conditions, low output and high cost. higher price

In this way, the cost of infiltration method increases a lot due to the burning loss of strontium

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