Abstract
The influence of the initial slurry properties on the resulting Ni-YSZ (yttria-stabilized zirconia) cermet structure that constitutes the solid oxide fueld cell anode has been examined. Rheological study of the slurry has been conducted as a function of powder concentration. The powder consisted of Ni (80 wt.%) and YSZ (20 wt.%) particles, and the slurry was prepared by mixing the powders in polyvinyl alcohol (PVA) solution. This suspension was shown to be pseudoplastic without a yield point and a model based on the Ostwald-de Waele power law has been developed. Porous structures resulting from slurry coating, sintering and infiltration were examined utilizing microprobe, scanning electron microscopy (SEM) and X-ray techniques. The resulting structure was shown to be inadequate when the slurry suspensions contained less than 12 or more than 13 vol. % of the powders.
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