Abstract
Mechanisms to stabilize mixed-oxide suspensions of Al{sub 2}O{sub 3} and ZrO{sub 2} (2 mol% Y{sub 2}O{sub 3}) were studied. The addition of a polyelectrolyte, ammonium polyacrylate, as a stabilizing agent was explored by evaluating the electrokinetic properties of electrophoretic mobility, sedimentation, and rheology. Highly viscous suspensions resulted when small amounts of polyelectrolyte were added to the ZrO{sub 2} (2 mol% Y{sub 2}O{sub 3}) suspensions. For these low-concentration-polyelectrolyte ZrO{sub 2} suspensions, a high zeta potential was calculated, suggesting that the experimental data most likely follow an electrostatic path model. To prepare mixed-oxide suspensions of Al{sub 2}O{sub 3} and ZrO{sub 2} (2 mol% Y{sub 2}O{sub 3}), it was necessary to adjust the pH of the polyelectrolyte-containing suspensions to a region where the ZrO{sub 2} (2 mol% Y{sub 2}O{sub 3}) was stable.
Published Version
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