Patent ID: 6558611
Filing Date: 2003-05-06
Classification: C04B

Abstract:
In a method for producing a ceramic foil, from a castable slip made of a dispersion of a ceramic powder in a solvent, the improvement comprisingmixing a slip comprising a ceramic powder and a non-organic solvent consisting of a water-based dispersion of an aqueous vinyl-acetate/ethene copolymer, having a monomer ratio of vinyl-acetate to ethene, to form a homogenous dispersion, and controlling or varying properties of the ceramic foil by adjusting i) the monomer ratio of vinyl-acetate to ethene in the water-based dispersion within a range from 95:5 to 75:25, so that foil softness increases with increased ethene quantity and foil hardness increases with increased vinyl-acetate quantity, and ii) ratio of powder quantity to polymer quantity, so that foil strength increases with increased powder quantity, the ceramic foil capable of being brittle; wherein a plasticizer of phthalate or polyhydric alcohol in an amount between 1 and 15 percent by weight relative to solids contents is added to the dispersion, the dispersion having a polymer constituent of 5 to 25 percent by weight relative to the solids content; applying the slip in a uniform thickness onto a solid base, followed by drying in a drying tunnel to produce a green foil that is crack-free, non-porous and non-warping.