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Influence of Suspension Characteristics on the Morphology of 3Y-ZrO2 Granules Produced by a Spray Drying Process


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-ZrOparticles, 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.
Start & End Page 
340 - 348
Received Date 
2009-01-12
Revised Date 
Accepted Date 
2009-04-23
Full Text 
  Download
Keyword 
3Y-ZrO2, granules, morphology, spray drying
Volume 
Vol.36 No.3 (SEPTEMBER 2009)
DOI 
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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