Abstract
A mixture of pure monolithic ZrO2and Y2O3 powders was flash-sintered at different holding times. The results show that flash-sintering led to a rapid phase transformation: The starting monolithic ZrO2completely transformed to tetragonal phase after the flash-sintering for as short as 10s. Although dense samples with relatively uniform microstructures were obtained at a holding time of longer than 5min, the holding time had no significant effect on grain size. Both the bulk and intrinsic grain-boundary conductivity increased with an increase in the holding time, indicating that flash-sintering created oxygen vacancies in both grains and grain boundaries that accumulated with an increase in the holding time.
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