RELATIONSHIPS BETWEEN FABRICATION PROCEDURES, STRUCTURE AND CONDUCTIVITY OF Ni/YSZ CERMET ANODES

摘要

A number of Ni/yttria stabilised zirconia (YSZ) cermet anodes for solid oxide fuel cells (SOFC) were examined to determine structural requirement, and in-plane conduction based on fabrication techniques. YSZ was prepared using 1100℃ and 1400℃ calcining temperatures and ball milling and centrifugal milling procedures to vary the particle size and particle distribution. Alternative paint compositions using methyl ethyl ketone (MEK) and ethanol and various binders were examined with the resulting slurries being air sprayed onto YSZ substrates. Sintering temperatures of 1250℃ to 1450℃ were used to determine the degree of sintering of both ceramic phases. Optical microscopy and scanning electron microscopy (SEM) were used to determine the structure of the resulting anodes. The resultant Ni/YSZ cermet anode required a relatively high density in order to obtain electronic conduction.