Hypereutectic aluminum-silicon alloy ultra-long-term dual modification method

Abstract

The invention discloses a method for ultra-long-acting double metamorphism of hypereutectic aluminum-silicon alloy, which specifically includes the following steps: 1) batching: configuring hypereutectic aluminum-silicon alloy; 2) configuring the weight of fluoride salt and carbon according to the total weight of aluminum-silicon alloy Powder weight, in the formula: ①The mass ratio of Si / (Ti+Zr+B+C) is 5≥Si / (Ti+Zr+B+C)≥2; ②The molar ratio of Ti, Zr, B, and C is Ti:Zr : B:C=1:1:2:2; 3) First, add the prepared aluminum and silicon materials into the intermediate frequency reactor to melt, then add the prepared potassium fluoroborate to react, and then add potassium fluorotitanate to react , then add graphene to react, add potassium fluorozirconate to react after the aluminum water heats up, pour off the remaining liquid fluoride salt after the reaction is completed, then heat up, keep warm; 4) pour the aluminum liquid in the intermediate frequency furnace into the transport bag, then It is poured into the ingot casting furnace, and the aluminum alloy is cast into an aluminum alloy ingot after the aluminum liquid is cooled down and the argon gas is degassed.

Description

technical field [0001] The invention relates to the technical field of modification methods for aluminum alloy materials, in particular to a long-term double modification method for hypereutectic aluminum-silicon alloys. Background technique [0002] Hypereutectic aluminum-silicon alloys have very good high-temperature mechanical properties, good wear resistance, good volume stability, and high temperature resistance. They are widely used in automotive engine pistons, petroleum industry and other industries that require lightweight and wear-resistant requirements. and other important industrial fields. Since the content of silicon in the hypereutectic aluminum-silicon system exceeds the eutectic point of the alloy, there are a large number of acicular or plate-like eutectic silicon structures and a large number of massive primary silicon structures in the micro-cast structure of the alloy. , if no modification treatment is carried out, the massive primary silicon particles ...

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Problems solved by technology

[0005] The existing process Al-Si alloy modification technology is mainly to add metamorphic elements in the alloy as the main technical means, among which the metamorphic primary silicon is mainly formed after adding P element to the aluminum liquid, forming AlP in the structure, and the primary silicon is formed in the structure during the solidification process. AlP is the crystal nucleus solidified so as to wait for the primary crystal silicon of fine particles. To achieve double modification, it is necessary to add elements such as Na, Sr, Ba, Te, Sb, S, Y, Ca, Bi, As, Ce, Nd, RE, etc. , but because the P element reacts with most elements, it cannot achieve double metamorphism, or although it does not react with elements such as S, Ce, Nd, Y, RE, etc., it will weaken each other in the process of joint metamorphism, resulting in the need A large amount of metamorphic elements is added, the metamorphic effect is average, and the effective time of metamorphism is short, it is difficult to exceed 10 hours to achieve the initial metamorphic effect; and almost all metamorphic treatment methods that rely on adding metamorphic elements are re-melted, due to metamorphic elements The metamorphic effect will be weakened due to burning, segregation and other reasons, and a certain amount of metamorphic elements need to be added again to supplement, which causes quality fluctuations and waste

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