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Technical Faculty Bor, University of Belgrade , Belgrade , Serbia
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Technical Faculty Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty Bor, University of Belgrade , Belgrade , Serbia
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Technical Faculty Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty Bor, University of Belgrade , Belgrade , Serbia
HBIS Group Serbia Iron & Steel , Smederevo , Serbia
The particle shape and size of the starting powders represent the most important physical
properties, on which the quality of the compacts and final sintered products depends. Two types of
powder were analyzed in the paper - electrolytic copper powder with a dendritic particle shape and
water-atomized copper powder with an irregular particle shape. The starting powders were sieved
through a sieve system with openings of 45 μm, 80 μm, and 120 μm. The characterization of the
obtained fractions of both powders was performed by determining the shape and dimensions of the
particles using SEM microscopy in combination with ImageJ software, and the apparent density
and flow rate were determined using the Hall flowmeter funnel. Pressing of each powder fraction
was done using a pressure of 600 MPa. The compacts were further sintered at 1000°C for 2 hours
to obtain the final sintered parts. After sintering, their density, hardness, and electrical conductivity
were determined and their microstructure was analyzed. The results indicate a great influence of
the characteristics of the starting powders on the properties of the final parts obtained by the
powder metallurgy route. The particle shape of the powders had a more pronounced influence
compared to the particle size.
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