Abstract
ABSTRACT Silicon carbide reinforcement in Alumina possess better physical and mechanical properties at elevated temperature. However, addition of second phase ceramic to matrix enhances the strength and hardness but it moderately improves the fracture toughness. The reason is due to lack of plastic deformation. Addition of ductile metallic phase helps in bridging the advancing crack in the matrix. In the present study, Alumina/nano SiC ceramic composite is toughened by the addition of copper metal particles. The influence of these metallic particles on behavior and mechanical properties of Alumina/SiC ceramic composite have been studied. The composite is processed using microwave hybrid sintering technique (2800 Watt) for one hour at 1400℃ and 1500℃. After sintering, microstructure of sample, grain size, relative densification, hardness and toughness have been examined. Highest densification of 93% and hardness of 1590 HV is achieved at 1400℃ sintering temperature while highest fracture toughness of 3.9 MPa m1/2 is achieved at temperature of 1500℃ with coarsening of alumina grains. The ductile phase in ceramic has proven to be effective for better bonding. It creates ceramic-metal bonds, which act as a tiny metal matrix between ceramic particles and contribute to ductile phase toughening in developed (Alumina/5% nano SiC/5%Cu) ceramic composite.
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