Microstructure and mechanical properties of Al2O3-Cu-Ni hybrid composites fabricated by slip casting
2020
This work focuses on developing the fabrication method of hybrid composites
based on Al2O3-Cu system with the addition of nickel phase. The composites
were prepared by slip casting and the slurries with a high concentration of
solid content were used. The sintered composites were characterized by XRD,
SEM and EDX. Selected physical proprieties, namely hardness, fracture
toughness and bending strength were also determined. The microstructure and
its influence on the mechanical properties were investigated. XRD analyses
revealed that the obtained composites contained Al2O3, Ni, Cu and solid
solution CuNi phases. The use of slip casting method allowed the production
of the composites characterized by relative density of _96%. An increase in
metallic phase concentration caused a decrease in Vickers hardness and
increased the fracture toughness of the Al2O3-Cu-Ni materials compared to
the Al2O3 samples. The results with high cognitive value and application
potential were obtained. This research enabled the foundations of an
innovative method of forming hybrid composite structures, which combined the
best features of ceramics (hardness, resistance to high temperature) with
metal properties (crack resistance, good electrical conductivity). This type
of composite can be used for temperature, conductivity and flow sensors.
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