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Recycling of aluminum beverage cans for metallic foams manufacturing
Authors:V Prieto Martínez  J Torres Torres  A Flores Valdés
Affiliation:1.Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo,Saltillo,Mexico
Abstract:This paper proposes recycling beverage cans (aluminum cans) to reduce the manufacturing cost of metallic foams, while it is discussed the effects of the alloying elements that reinforce the metallic matrix in resistance to compression, due mainly in part to the formation of the phase β-Al6(FeMn). The manufacturing process used for the metallic foams was the Alporas modified, using an excess of 10 wt% pure calcium. This allowed not only to modify viscosity of the molten alloy but also to obtain important quantities of the reinforcing phase Al4Ca. Once obtained, the foams were characterized using techniques including differential thermal analysis, optical microscopy, scanning electron microscopy, chemical analysis and compression tests. Additionally, Image J software was used to determine the percentage of porosity and the average pore size of the metallic foams. Foam density was calculated by immersion in water using the Archimedes principle. The results showed that foams manufactured with beverage cans have a homogeneous porous structure with an average porosity of 80%, an average pore size of 3 mm, a specific gravity 0.4 and a compressive strength of 22 MPa. These results are superior to those obtained in foams manufactured with pure aluminum as well as alloying foams such as Al–12Si–0.6Mg (A413), and Al–1Mg–0.6Si (A356).
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