ANALISA EFEK BAHAN CETAKAN MORTAR DAN BAJA TERHADAP SIFAT FISIK DAN MEKANIK CORAN ALUMINIUM

A Sofwan F Alqap, Redo Vanesa, Hendra, Agus Suandi, Dedi Suryadi(1),
(1) Program Studi Teknik Mesin, Universitas Bengkulu, 

Abstract


Aluminum based carbonated beverage cans have been recycled by melting process where commercial coal bricket was as the heating source and the electrical air blower as the temperature control. The cans were melted in steel mug opens to uncontrolled atmosphere. The molten was left uncovered, no material was put on. Temperature check was by infra red thermometer or pyrometer. At 716 °C the molten was ready to pour. The pouring was to two open molds of mortar and steel. The mortar was cement and sand mixture by 1:3 ratio being mixed by the amount of water up to the mixture was moldable. The series of tests being done upon the casting product were quantitative metallography measuring porosity, scale B Rockwell hardness tester, and Charpy impact tester. The cast of mortar mold was characterized by higher porosity than that of steel mold; they sequentially are 14.65% and 1.72%. However the hardness and the impact value of the mortar mold were larger than those of the steel. The hardness (HRB) are 71.1 (max), 21.7 (min) and 45.878+12.026 (average) of the first, 63.8 (max), 25.6 (min) and 42.711+7.317 (average) of the second. The impact values (J/cm2) are 23.0 (max), 2.5 (min) and 11.72+7.107 (average) of the first, 10.2 (max), 2.5 (min) and 6.18U2.303 (average) of the second. Nevertheless the mortar mold contributed higher mechanical property, the fluctuation range is wide, whilst the
steel mold has the least fluctuation range. The wide fluctuation is likely affected by high porosity.

Keywords


recycling; aluminum; casting; mortar mold; steel mold; porosity; hardness; impact

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