To reduce the surface tension of water, aqueous tape casting of Ce0.8Sm0.2O1.9 (SDC) was performed using triethanolamine (TEA) as a dispersant that also acted as a surfactant, with polydimethyl siloxane as a deformer. TEA and polyvinyl alcohol (PVA) binder were pre-dissolved and added in a dilute stage to guarantee a homogeneous distribution of the slurry. Zeta potential studies showed that the isoelectric point (IEP) of SDC particles moved from pH = 3.69 to pH = 4.29 after 2 wt.% TEA (based on the SDC powder) was added, while absolute value of the zeta potential reached a maximum value at pH ≈ 10. The slurry with 60 wt.% solid content exhibited a typical shear thinning behavior. Flexible and homogeneous green tapes with smooth surfaces were obtained after drying. The SDC green tapes with a high green density of 56.9% exhibited an ultimate tensile strength of 1.39 MPa and a strain to failure of 52%.

Keywords: Aqueous tape casting, SDC, TEA, Dispersant, Surface tension