Optimization of parameters for tape casting of yttria stabilized zirconia (YSZ8) by Taguchi design for electrolyte solid oxide fuel cell

In the present study, optimization parameters for the tape casting is studied to produce a Yttria-stabilized zirconia (YSZ8) thick films for using as solid electrolytes in solid oxide fuel cell (SOFC). Taguchi designed experimental procedure was used to consider the characteristics of the slurry, such as the percentage of solid phase, binder and the ratio of plasticizers to the binder. The results indicated that the percentage of solid-phase have the greatest influence on the slurry viscosity and green density. Therefore the slurry containing the maximum possible solid-phase with the proper percentage of binder and plasticizers which provides an acceptable viscosity, can be selected as the proper slurry. This slurry is used to produce a relatively dense tape which sintered at 1450°C for 2 h. The density of sintered tape was 97% of theoretical density. The ionic conductivity of the sintered sample was determined with impedance measurement in temperature range of 300 to 800oC. The measured conductivities were 1.088×10-5 Ω-1.cm-1 at 300oC and 2.27×10-2Ω-1.cm-1 at 800oC.