Processing of metal wastes for high damping metal composite

Abstract

Abstract The material of aluminum and the gray cast iron are widely used, so that also produce a large scale of waste from the manufacturing processes. In relation with supporting the global program of sustainable recycling-oriented society, the waste of aluminium and gray cast iron chips will be utilized in this research to become a valuable, functional and useful material. The waste of gray cast iron chips and aluminum chips were used in this research. Three compositions were provided in this research namely, composition of Al chips with addition 0, 20, and 40 vol.% of gray cast iron chips. The process was initiated by compacting the chips to become a billet with 70 mm length and 60 mm in diameter. The hot extrusion was carried out at 400°C with pressure at 500 Ton. The lubricant that was used at the die was MoS2, mean while the graphite colloid was utilized as lubricant at main cylinder of extrusion. Final diameter of the product was 15 mm. The process then was continued with swaging the specimens. The process of swaging was done following 3 steps in room temperature, initiated by swaging from 15 mm to become 14 mm, continued by swaging until reach 12.5 mm and finally by swaging the specimen until reach 11 mm in diameter. The hammering vibration test then was carried out to obtain the damping capacity of the specimen with length of the specimen at 150 mm and 11 mm in diameter. For specimen with composition 0% gray cast iron, the value of damping capacity (α) is found 45[s-1]. For specimen with composition 20% gray cast iron, the value of damping capacity is found 61 [s-1]. The damping capacity for the specimen with composition 40% gray cast iron is found very hight that reach up to 90 [s-1]