Granulation process can be realised by dry or wet methods. Dry granulation is preferred when the product is sensitive to water. Extruders, tumbling beds etc. can be used for dry granulation. In wet granulation, a binder solution in liquid form is used to facilitate the agglomeration process. Spray drying is widely used in the advanced ceramic industry to improve the flowability of fine powders. Bertrand, studied to determine the characteristics of spray-dried granules prepared from yttria doped zirconia slurries . Bala showed two different ways, spray drying and spray freeze drying, to yield flowable, full granules from nanopowders based on yttria stabilized zirconia. Bertrand explained the properties of ceramic coatings performed using spray drying and used polyvnyl alcohol as a binder in his experiments.
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