High-purity AlSi14A alloy and preparation technique thereof

Abstract

The invention discloses a preparation technique of high-purity AlSi14A alloy. Raw materials are composed of 4N pure aluminum ingots, 4N pure aluminum liquid and industrial silicon. The preparation technique comprises the steps that firstly, 60% of the 4N pure aluminum ingots are added in proportion, heated and melted; then the industrial silicon is laid on the surface of aluminum melt; after the silicon is completely melted, 40% of the 4N pure aluminum liquid is laid on the surface of the industrial silicon, and the effect that the industrial silicon is sufficiently melted is guaranteed; then sufficient stirring is conducted; after sufficient stirring is conducted, a refining agent is added, refining is conducted when the temperature is controlled to be 710-730 DEG C, after refining is finished, molten slag on the surface is cleaned away, and standing is conducted; and refining alloy liquid is cast. By the adoption of the preparation technique, a traditional raw material adding mode is changed, a part of the 4N pure aluminum ingots are firstly added, heated and melted in the raw material adding process, and after the temperature of the melt reaches 800 DEG C, the industrial silicon is laid on the surface of aluminum melt; then another part of the 4N pure aluminum liquid is laid on the surface of the industrial silicon, the effect that the industrial silicon is sufficiently melted is guaranteed, and the uniformity of Si is guaranteed.

Description

technical field [0001] The invention relates to a high-purity AlSi14A alloy and a preparation process thereof, belonging to the field of aluminum alloy materials. Background technique [0002] Aluminum-silicon alloy is a forging and casting alloy mainly composed of aluminum and silicon. At the same time, adding a small amount of copper, iron, and nickel can increase the strength. When the silicon content is low, the aluminum-silicon alloy has better ductility and is often used to make deformed aluminum alloys; when the silicon content is high (such as 7%), the aluminum-silicon alloy melt The filling property is good, and it is often used as casting alloy. In aluminum-silicon alloys with a silicon content exceeding the Al-Si eutectic point (Si12.6%), when the silicon particle content is as high as 14.5%-25%, adding a certain amount of Ni, Cu, Mg and other elements can improve its comprehensive performance. performance. [0003] The Al-Si alloy with Si content of 12.5% ​​pr...

AI Technical Summary

Problems solved by technology

The disadvantages of this technical solution are mainly due to the addition of industrial silicon, which leads to the failure of the Si element to melt in the aluminum melt at a higher temperature, which has a greater impact on the internal structure of subsequent products, thus failing to meet customer requirements.

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