SOURCE OF WATER AND ITS EFFECT ON TAPE CASTING BARIUM-TITANATE

The source of water and its effect on rheological and green tape properties of tape cast barium titanate were studied. The total water content, as well as the source, affect the slip rheology, green density, tensile strength, and strain to failure in the unsintered body. Sources of the water were broken down into contributions from the barium titanate powder surface versus from the solvent or ceramic additives. Water adsorbed on the powder surface was generally beneficial compared to water entering through the solvent. For carefully dried systems, below 0.15 wt% total water, properties change dramatically with small changes in water content. Thus, less stringent processing requirements can be used to achieve reproducibility at water contents above 0.15 wt%. Copyright © 1990, Wiley Blackwell. All rights reserved