OS0501 Fabrication of PSZ-Ti Functionally Graded Material by Spark Plasma Sintering Method and Evaluation of Fracture Toughness
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This paper deals with investigation of fracture toughness of FGM consisting of partially stabilized zirconia(PSZ) and titanium(Ti) fabricated by spark plasma sintering(SPS). In the PSZ-Ti FGM, PSZ and Ti are placed on a surface and substrate, respectively, and then a PSZ content is reduced by 10-20% from 100% at the surface to 0% at the substrate. Specimen surface is observed with an optical microscope to investigate sintering condition of the specimen. After that, micro-Vickers and Vickers hardness tests are performed to determine distributions of Vickers hardness and fracture toughness, respectively. The dense compact of PSZ-Ti FGM is obtained by SPS because any large voids and defects are not observed and the relative density of the FGM is about 95%. The Vickers hardness increases with increasing PSZ volume fraction. The fracture toughness, however, does not improve although Ti volume fraction is increased.
