Binder segregation in the processing of ceramics
- Nagaoka Univ. of Technology, Niigata (Japan)
The surface segregation of poly(vinyl alcohol) during the drying process was quantitatively studied by a model experiment of one-dimensional drying and a mathematical simulation. The drying behavior of the slurry with binder and the relationship between the binder segregation and defect formation in compact also were examined. The binder segregation shortens the constant rate period, and drying shrinkage continues occurring during the early fall rate period. The PVA segregation increased with increasing drying temperature and PVA initial concentration. The segregation was significantly restrained by full adsorption of PVA on the alumina particle surface before drying at a low concentration. The segregation in spray dried granules was also directly observed by the immersion liquid technique. The hard shell of the granule is responsible for a low packing density region between the granules. The mathematical simulation agreed with the experimental results very well. This simulation has great potential to predict the segregation of soluble components in thick films and small granules where it is difficult to determine the component distribution directly.
- OSTI ID:
- 518596
- Report Number(s):
- CONF-960367--
- Country of Publication:
- United States
- Language:
- English
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