Abstract
The rheological properties of three powder-binder blends, composed of three powders having distinct powder surface charges mixed with a multicomponent binder containing stearic acid, were compared in this study. The powders were tungsten (W), yittria-stabilized zirconia (YSZ, ZrO 2 -3mol%Y 2 O 3 ), and alumina (Al 2 O 3 ), in the order from an acidic powder surface to a basic powder surface. Interfacial reaction as a consequence of Lewis acid-base reaction determined the rheological properties of the blends. Due to the fact that tungsten has a very strong acidic surface oxide layer, its powder-binder blend exhibited the highest apparent viscosity and highest activation energy of flow though it has the smallest surface area per unit volume. On the other hand, the obvious interfacial reaction between alumina and stearic acid caused this powder-binder mixture to have the lowest apparent viscosity and a low activation energy of flow.
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