Leveling and thixotropic characteristics of concentrated zirconia inks for screen-printing |
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Authors: | John W Phair Mats Lundberg Andreas Kaiser |
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Institution: | 1.Department of Fuel Cells and Solid State Chemistry, Ris? National Laboratory for Sustainable Energy,Technical University of Denmark,Roskilde,Denmark |
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Abstract: | Screen-printing is a cost-effective method for the mass manufacture of zirconia-based solid oxide fuel cells (SOFCs) and oxygen
separation membranes. The present work outlines an investigation into the leveling, thixotropic, and screen-printing characteristics
of concentrated zirconia inks by a variety of rheological and imaging methods. A combination of viscosity, shear rate jump
experiments, creep and recovery analysis, and yield stress measurements were used to assess ink thixotropy. Oscillatory rheometry
and scanning electron microscopy/optical microscopy revealed a consistent effect of ethyl cellulose (binder) content upon
the thixotropic and leveling characteristics of zirconia inks. While the yield stress (τ
0), extent of recovery R(%), and rate of recovery (K) increase with increasing binder content, so did the surface roughness
and thickness of the screen-printed films. Increasing the binder content not only increases the network strength of the thick
films but also leads to increased leveling time. As a result, rheological modifiers are proposed to be necessary to improve
the leveling characteristics of zirconia inks without losing the green strength of the thick films. |
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Keywords: | Inks Thixotropy Yield stress Leveling Coatings |
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