Paper Type |
Contributed Paper |
Title |
Influence of Suspension Characteristics on the Morphology of 3Y-ZrO2 Granules Produced by a Spray Drying Process |
Author |
Kunjana Suwunnasung, and Apinon Nuntiya |
Email |
anuntiya@chiangmai.ac.th |
Abstract: A systematic study was performed to determine how the 3Y-ZrO2 formulation (e.g. pH, dispersant level, binder addition) affects the granule characteristics. Suspensions consisting of 50 wt.% of 3Y-ZrO2 particles, 0.25 wt.% polyacrylic acid (PAA) as a dispersant and 1.5 wt.% polyvinyl alcohol as a binder were investigated using settling experiments and rheological analyses. Strong correlation exists between zeta potential, particle size volume, yield stress and viscosity. The isoelectric point (IEP) of 3Y-ZrO2 suspension occurred at pH 6. Adsorption of the polyelectrolyte (PAA) on the particle surface moved the IEP to lower pH and increased the negative zeta potential in a large range of pH above the IEP. A minimum of 0.25 wt% PAA moved the IEP from pH 6 down to lower pH values around 3. At pH 4, flocculated suspension leads to the formation of solid granules whereas a dispersed suspension at pH 10 leads to hollow granules.
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Start & End Page |
340 - 348 |
Received Date |
2009-01-12 |
Revised Date |
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Accepted Date |
2009-04-23 |
Full Text |
Download |
Keyword |
3Y-ZrO2, granules, morphology, spray drying |
Volume |
Vol.36 No.3 (SEPTEMBER 2009) |
DOI |
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Citation |
Suwunnasung K. and Nuntiya A., Influence of Suspension Characteristics on the Morphology of 3Y-ZrO2 Granules Produced by a Spray Drying Process, Chiang Mai J. Sci., 2009; 36(3): 340-348. |
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