Microstructures and Mechanical Properties of Spark Plasma Sintered Al₂O₃-Co Composites Using Electroless Deposited Al₂O₃-Co Powders

抄録

Microstructures and mechanical properties of spark plasma sintered (SPS) Al₂O₃-Co composites were investigated depending on the sintering temperatures (900–1200°C) and cobalt contents (0∼12 mass%). The material properties of relative density and fracture toughness increased as the sintering temperature and Co content (up to 12 mass%Co) increased. In the SPSed Al₂O₃-Co composite sintered at 1200°C, maximum values of relative density and fracture toughness about 99.3% and 8.1 MPam^1⁄2, respectively were obtained. The fracture morphology of SPSed Al₂O₃-12 mass%Co composite showed a semi-brittle fracture mode due to the homogeneous dispersion of fine-sized Co particles.