Properties of zinc alloy in green sand casting

Abstract

Zinc alloy casting industry using green sand molding is increasingly becoming to very competitive circumstance. So, this paper is to produce tertiary alloy of Zinc-Aluminium- Magnesium (Zn-3Al-2Mg) with different composition of bentonite and silica sand in the green sand mould. However, Zinc alloy casting using green sand still now plays an important role in the foundry society, because it allows us to manufacture at low cost and also sand can be recycled. . The mentioned method of mould is differing in composition of bentonite with 5%- 17%. Differ in the composition of bentonite and silica sand give differ in result. Sample with 13% of bentonite is the best surface properties while sample of 5% and 17% of bentonite gave dull surface properties. Meanwhile, for the hardness test and the tensile strength, the results show the same with the surface properties. The morphologies give not much difference from each other. Sample of 13% of bentonite have the most amount of grain boundaries and the grain boundaries size is much bigger than the others.