Articles
  • Aqueous tape casting of SDC with a multifunctional dispersant
  • Xibao Li*
  • School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China
Abstract
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

This Article

  • 2012; 13(3): 324-329

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