Abstract
A non-destructive evaluation (NDE) technique of impedance spectroscopy (IS) was employed for studying the sintering process of nanostructured yttria-stabilized zirconia (YSZ) after exposure at 1100 °C in air for different times. The variations within microstructure of YSZ were correlated with the EIS parameters. The results showed that the resistance and capacitance of YSZ grains (g) and grain boundaries (gb) varied with the sintering time. The resistance of YSZ g and gb increased significantly in 10 h, which may correspond to closure of pores. While during the stage from 10 to 200 h, the resistance of the g was basically consistent, and the gb decreased with the growth of g, which indicated that the gb resistance was more sensitive to grain size. The change of porosity and pore shape could be interpreted through impedance parameters. The porosity decreased and the shape of pores became smaller and rounder with the increasing sintering time.
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