Pengaruh Dimensi Scrap Aluminium(Al) dengan Campuran Timah Hitam (Pb) Sebesar 400 Gram terhadap Kekerasan Dari Hasil Pengecoran dengan Menggunakan Cetakan Permanen
This study aims to determine the effect of the dimensions of Aluminum
scrap with a mixture of Black Tin (Pb) of 400 grams on the hardness of
casting results using a permanent mold.
The initial process is to prepare materials such as Aluminum (Al) and
lead, then the material is cut to a size of 5 cm x 5 cm x 1 cm, 7,5 cm x 7,5 cm
x 1 cm and 10 cm x 10 cm x 1cm. After the material is ready, then the next
process is to weigh the Aluminum material every dimension weighing 2 kg
and adding Black Tin by 400 grams of the weight of Aluminum. Then proceed
with preheating the permanent mold and crucible furnace before the
ingredients are put into the furnace. Aluminum and Black Tin are inserted into
the furnace for the smelting process, after which aluminum and lead melt are
then poured into a permanent mold. The next process is to wait for the
castings to harden and then proceed to dismantle the results of the castings.
In testing Brinell hardness the product of castings with tin mixture of 400
grams for material size 5 cm x 5 cm x 1 cm is 98,559 BHN, material with a
size of 7.5 cm x 7.5 cm x 1 cm is 88,832 BHN and for material size 10 cm x
10 cm x 1 cm is 83.82 BHN. If seen from the table of chemical composition of
the largest element content in this study is Aluminum silicon alloy (Al-Si)
microstructure in the cast material size 10 cm x 10 cm x 1 cm has more and
larger grain shapes, compared to castings products with material size 5 cm x
5 cm x 1 cm and 7.5 cm x 7.5 cm x 1 cm.
Keywords : Casting, Aluminium, Lead, Scrap, Brinell
