Microstructures and Mechanical Properties of Spark Plasma Sintered Al_2O_3-Co Composites Using Electroless Deposited Al_2O_3-Co Powders
Microstructures and mechanical properties of spark plasma sintered (SPS) Al<SUB>2</SUB>O<SUB>3</SUB>-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 Al<SUB>2</SUB>O<SUB>3</SUB>-Co composite sintered at 1200°C, maximum values of relative density and fracture toughness about 99.3% and 8.1 MPam<SUP>1⁄2</SUP>, respectively were obtained. The fracture morphology of SPSed Al<SUB>2</SUB>O<SUB>3</SUB>-12 mass%Co composite showed a semi-brittle fracture mode due to the homogeneous dispersion of fine-sized Co particles.
- Materials transactions
Materials transactions 49(6), 1451-1455, 2008-06-01
The Japan Institute of Metals and Materials