ANALISIS PENGARUH TEMPERATUR TUANG TERHADAP KEKERASAN DAN KEKUATAN TARIK DARI PADUAN Al19,6Si-2,5Cu,2,3Zn (DAUR ULANG) HASIL PENGECORAN EVAPORATIVE

Abstract

Aluminum rongsokan has considerable potential as an engineering material for making an engine element. During this time aluminum rongsok still not utilized by manufacturing industry as product. One technology to make products from Al rongsok is metal foundry technology. Al rongsok can be recycled and potentially produce various component products. This study aims to determine the hardness and tensile strength of evaporative foundry results. The furnace for smelting uses the furnace krusibel with charcoal wood fuel. Material for casting used Al-19,6Si-2,5Cu- 2,3Zn rongsok alloy. The foundry method used is evaporative casting. Styrofoam as a pattern dumped in the sand print. This method will produce castings that match the pattern of styrofoam formed. Al alloy is melted in crusible furnace then poured with variation of casting temperature 650, 660, 670 and 680 oC. The results showed that the pour temperature had an effect on the value of hardness and tensile strength. At temperatures above 650 oC, the value of the hardness decreases with the increase of pouring temperature. At temperatures above 650 oC the tensile stress increases with the increase in pouring temperature