Production of ceramic jointing foil, used for joining ceramic articles by reaction bonding, uses separate deagglomeration and homogenization on ceramic powder and metal powder in solvent and dispersant before mixing

摘要

In the production of ceramic jointing foils a mixture of (alcoholic) solvent and dispersant is prepared and divided into 2 portions; these are used in deagglomeration and homogenization of ceramic powder and nanodisperse oxidizable passivated metal powder (under 5-10 mu m); the deagglomerated batches are combined, then made into the slip by mixing homogeneously with organic additives. Production of ceramic jointing foils with reduced shrinkage involves mixing ceramic powder(s) with a solvent, e.g. alcohol, and optionally dispersant, deagglomeration and conversion to a castable slip by mixing homogeneously with addition of organic additives, e.g. binder and plasticizer, separating the mixing bodies, degassing, casting on a substrate, preferably PTFE tape, and drying. A mixture of preferably alcoholic solvent and dispersant is prepared and divided into 2 portions that are used separately in deagglomeration and homogenization of (1) ceramic powder(s) and (2) nanodisperse oxidizable metal powder(s) which has a maximum particle size distribution of less than 5-10 microns for complete oxidizability and a passivated oxide film at room temperature. The deagglomerated batches are combined, then made into the slip by mixing homogeneously with the organic additives.