Hypereutectic aluminum-silicon alloy modifier and preparation method thereof

Abstract

The invention discloses a hypereutectic aluminum-silicon alloy modifier and a preparation method thereof, and relates to a novel modifier for thinning a hypereutectic aluminum-silicon alloy and a preparation method for the modifier. The hypereutectic aluminum-silicon alloy modifier is characterized by comprising the following components in percentage by mass: 10 to 50 percent of Al, 1 to 10 percent of P, 20 to 50 percent of Cu, less than 0.5 percent of Fe, less than 0.5 percent of Re, and less than 0.5 percent of others. The preparation method sequentially comprises the following steps of: (1) preparing Al-Cu-P composite powder; (2) pressing and molding the Al-Cu-P composite powder in a die; and (3) sintering the molded Al-Cu-P, and thus obtaining the hypereutectic aluminum-silicon alloy modifier. The prepared modifier is low in modification temperature and short in modification time, can realize online modification, is low in adding quantity, does not produce smoke when being added, is high in phosphorus absorption rate, few in pollution gases, simple in production process and obvious in economic benefits, and is a green, pollution-free, efficient, stable and low-cost novel hypereutectic aluminum-silicon alloy modifier.

Description

technical field [0001] A hypereutectic aluminum-silicon alloy modification agent and a preparation method thereof relate to a novel modification agent for refining a hypereutectic aluminum-silicon alloy and a preparation method thereof. Background technique [0002] The hypereutectic aluminum-silicon alloy contains as much as 17%~26% silicon. It is a kind of well-composited self-generated silicon particle reinforced matrix composite material. Because of its low alloy density, low linear expansion coefficient, good wear resistance and volume stability High quality and good casting performance and many other advantages, it has been more and more widely developed in the industry. Especially with the emergence of high-power high-pressure internal combustion engines, hypereutectic Al-Si alloys have become the focus of attention. Since the primary silicon in the hypereutectic Al-Si alloy tends to be in the shape of thick plate and five-lobed star, which deteriorates the propertie...

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Problems solved by technology

The advantages of this master alloy are convenient transportation, less pollution, and obvious metamorphic effect, but because of its relatively high metamorphic temperature, refractory, easy to segregate, and the preparation requires high energy consumption, the addition of Cu and other elements limits the use of some alloys

As a result, some manufacturers began to use phosphorus-containing compounds to modify primary silicon, such as P 2 o 5 +AlPO 4 , Potassium Fluotitanate, Sodium Chloride, etc. Although these compounds have good metamorphic effects, they produce a lot of slag and smoke during the metamorphic process, which pollutes the environment, and the metamorphism is unstable, which is not conducive to industrial production

In recent years, some domestic experts have developed AlP alloys. For example, Liu Xiangfa of Shandong University (patent approval number CN1410565) developed "A Aluminum-Phosphorus Master Alloy and Its Preparation Method". Small, but due to its complicated preparation process, high price, and high toxicity, there are great safety problems, so its application is also limited to a large extent

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