Grain Boundary Precipitation in Zirconia
Recent work1,2 has shown calcia partially stabilised zirconia (PSZ) to have good thermal shock resistance. This indicates a degree of toughness in the material. However, the heat treatments needed to produce the optimum microstructure for strength and toughness have not been investigated. Garvie3 intuitively expected this two-phase ceramic to consist of a grain boundary precipitate of pure ZrO2 (10–20 microns) and a much finer dispersion of monoclinic ZrO2 (0.1–0.2 microns) within the cubic grains. The improved properties of calcia PSZ were thought to be due to the finer precipitate of pure ZrO2.
KeywordsBoundary Phase Fracture Strength Boundary Precipitation Partially Stabilise Zirconia Fracture Edge
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