| dc.description.abstract | Copper is a material commonly used as the main electrode material for EDM
machines. This element is known to have excellent electrical conductivity, but overall
it lacks mechanical properties. Generally, improvements in mechanical properties
are achieved by increasing the sintering pressure or temperature, by hot compaction
during the compaction process, or by combining with other elements to improve the
required properties. The optimum temperature for the hot compaction process is
generally in the range of 100–200 °C. The aim of this research is to determine the
effects of variations in hot compaction temperatures of 100 °C, 200 °C, and 250°C,
which are expected to improve the mechanical properties of Cu-Ni-W alloy as an
EDM electrode alloy material. For the powder mixing process, a horizontal ball mill
is used with a rotation speed of 300 rpm for 2 hours, then it is put into a mold for a
compaction process at a pressure of 250 MPa for 15 minutes with a compaction
temperature of 100oC, 200oC and 250oC. The sintering process was carried out at a
temperature of 770oC in an electric muffle furnace for 60 minutes. The tests include
density, hardness, compression, electrical conductivity and microstructure tests. The
highest value was achieved at a temperature of 250oC, namely a density of 7.623
g/cm3, a hardness of 100.2 VHN and an electrical conductivity of 60.87% IACS, and
the microstructure test results showed that increasing the compaction temperature
would result in further bonding of the alloy structure, but more porosity was found. | en_US |
