CHARACTERISTICS OF TAPE CASTING SLURRIES CONTAINING FORSTERITE, PVB AND ORGANIC-SOLVENT

Investigations were carried out to study the rheology, dispersion and polymer adsorption of a tape casting slurry system containing forsterite, various PVB binders and solvents. For untreated forsterite, slurries may show shear-thickening behavior with either polar or nonpolar solvent. No binder was found to adsorb on forsterite in well-dispersed ethanol slurries. Low sediment packing density and substantial PVB adsorption were observed in slurries containing less polar solvents such as MEK or toluene. However, a change in the forsterite surface conditions can alter these results. In general, slurry properties are related to the solvent polarity, hydroxyl content of PVB, and surface characteristics of the ceramic particles.