Al-Sb-Y-Mg modifier for hypoeutectic Al-Si alloy and preparation process thereof

Abstract

The invention discloses an Al-Sb-Y-Mg modifier for a hypoeutectic Al-Si alloy, which consists of the following elements according to weight percent: 82 percent to 92 percent of aluminum, 5 percent to 15 percent of antimony, 1 percent to 2 percent of yttrium, 1 percent to 2 percent of magnesium, and 1 percent to 2 percent of aluminum covering agent. The aluminum covering agent comprises 50 percent by weight of NaCl powder and 50 percent by weight of KCl powder. The invention also discloses a method for preparing the modifier, which comprises the steps of placing aluminum ingot accounting for 82 percent to 92 percent of the modifier in weight percentage into a graphite crucible with temperature of 450 to 550 DEG C and adding the aluminum covering agent accounting for 1 percent to 2 percent of the modifier in weight percentage; increasing the temperature to 760 to 800 DEG C; later adding antimony ingot accounting for 5 percent to 15 percent of the modifier in weight percentage, yttrium ingot accounting for 1 percent to 2 percent of the modifier in weight percentage, and magnesium ingot accounting for 1 percent to 2 percent of the modifier in weight percentage into molten aluminum liquid in sequence and keeping the temperature for 20-30min; then introducing argon gas at a place of 8-15mm away from a melt bottom at flow of 8-20ml / s and implementing refining for 2-5min on the melt; and finally removing the slag and pouring the melt into a metal type die, and cooling to room temperature.

Description

technical field [0001] The invention relates to an Al-Sb-Y-Mg modifier for a hypoeutectic aluminum-silicon alloy and a preparation process thereof, belonging to the technical field of aluminum alloy applications. Background technique [0002] Aluminum alloy is a light metal material widely used in industrial production at present. It has the advantages of low density, high reflectivity to light, heat and radio waves, good surface treatment performance, superior shock absorption and noise reduction performance, etc. Therefore, it is widely used in aerospace, In various fields such as aviation, navigation, automobile, building materials and daily style, among them, Al-Si alloy with excellent casting performance is widely used. By weight percentage, the Al-Si alloy with a silicon content of less than 12.6% is a hypoeutectic Al-Si alloy, which first precipitates the primary α-Al phase during solidification, and then undergoes eutectic reaction to form (α-Al+Si) eutectic Al-Si al...

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Problems solved by technology

Although strontium has a good metamorphic effect, since strontium is a rare and precious metal, our country has few resources, small domestic production, and high price, and the aluminum alloy melt treated with strontium has a large amount of hydrogen absorption, which is easy to cause pores in aluminum alloy castings, etc. Defects, low product yield

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