Smelting degassing method of aluminum-silicon alloy liquid

Abstract

The invention relates to a smelting degassing method of aluminum-silicon alloy liquid. Aiming at the actual condition that gas and impurities exist in the aluminum-silicon alloy liquid in the smelting course, a method of smelting direct-current electric field purification and circulation degassing outside a furnace is adopted to remove 99.5% of main gas, i.e. hydrogen, from the aluminum-silicon alloy liquid, so that an aluminum-silicon alloy having a compact metallographic structure can be obtained, and the aluminum-silicon alloy has no bubble or shrinkage cavity and is not subject to shrinkage porosity. The method has the advantages of advanced and reasonable process, continuous step, environment protection and energy conversation, the properties of aluminum-silicon products are greatly enhanced, the tensile strength can be enhanced by 91%, and the method is an ideal degassing method of aluminum-silicon alloy liquid.

Description

technical field [0001] The invention relates to a method for smelting and degassing aluminum-silicon alloy liquid, which belongs to the technical field of nonferrous metal alloy smelting technology and process methods. Background technique [0002] Aluminum-silicon alloy is a reinforced non-ferrous metal alloy, which is widely used in aerospace, electronics industry, automobile industry, etc. due to its good mechanical properties, strength and hardness. [0003] Aluminum-silicon alloys often appear in mechanical parts in the form of castings. During the smelting and casting process of aluminum-silicon alloys, impurities and gases, mainly hydrogen, form bubbles inside the castings, seriously affecting the quality of the castings, and even shrinkage. Pores and shrinkage. [0004] There are also many methods for casting degassing, such as: adsorption purification method, which uses adsorbents and refining agents to filter impurities and gases; for example: blowing method, also...

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Problems solved by technology

[0004] There are also many methods for casting degassing, such as: adsorption purification method, which uses adsorbents and refining agents to filter impurities and gases; for example: blowing method, also known as bubble flotation method, which uses nitrogen + The mixed gas of hydrogen + chlorine + chloride salt forms bubbles in the aluminum-silicon liquid, and the bubbles float up to degas and remove slag; for example: flux method, adding flux to the aluminum-silicon liquid, through chemical and physical effects, inclusions and hydrogen floating liquid surface, and then cleared; for example: filtration method, using active materials to make filters, separating solid inclusions and gases suspended in aluminum-silicon liquid; there are also static methods, vacuum methods, ultrasonic methods, etc., but these methods are different The disadvantages of the degree, the lack of degassing rate, seriously affect the quality of castings

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