Abstract
Densification, microstructure and mechanical properties of Al2O3-CA6-ZrO2/Ni multi-phase composites depend on different parameters, particular the holding time and pressure during the hot pressing sintering process at 1650 °C. In this study, the fine grain size, low porosity and dense structure of composites obtained for a holding time of 30 min under a pressure of 30 MPa. Meanwhile, the wettability between the Ni particles and the matrix was significantly improved owing to the homogeneous distribution of Ni phase. In addition, the systematically optimized sintering parameters resulted in the achievement of a relative density of 98.07% with an excellent Vickers hardness of 16.2 GPa, combining a flexural strength of 458.24 MPa with an acceptable fracture toughness of 7.20 MPa m1/2 for a holding time of 30 min under a pressure of 30 MPa. The toughening mechanisms of composites are also discussed in detail around the sintering parameters while the dominant ones are the transgranular fracture and crack deflection.
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