Abstract
This study aims to investigate effect of reinforcing additives such as Ni particles, Inconel 600 fibers, SiC particles (SiCp), SiC whiskers (SiCw) and Al2O3 particles on strength of transformation toughening of partially stabilized zirconia (PSZ) containing 3 mol% Y2O3 fabricated by spark plasma sintering (SPS). A mechanism of enhancement of transformation toughening of PSZ was examined based on micro-macro coupling experimental examinations with micromechanics continuum model. Experimental results demonstrated that Ni and 3 vol% Al2O3 additions were effective to enhance indentation fracture toughness, and 3 vol% Al2O3-added PSZ showed the highest bending strength among the tested samples. Relatively large cracks were present in SiCp and SiCw-added samples, which can degrade bending strength and deformability. Ni addition can only promote deformability of PSZ. Micromechanics-based simulation indicated that SiCp and Al2O3 additions can enhance transformation toughening in PSZ due to internal stresses generated in fabrication processes.
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