| abstract |
Zirconium dioxide powder having a ZrO 2 content of at least 70% by weight, present in the form of aggregated primary particles, having no internal surface and having a BET surface area of 60 ± 15 m 2 / g powder And / or the zirconium mixed oxide powder is predispersed in the dispersant in the presence of 0.1 to 5% by mass of a surface modifier with respect to the total amount of the dispersion with an energy introduction of less than 200 KJ / m 3 , The pre-dispersion thus obtained is divided into at least two partial streams, these partial streams are placed under a pressure of at least 500 bar in a high energy mill, which is depressurized via a nozzle, and this partial stream is gas or In a reaction chamber filled with liquid, which is obtained by colliding with each other and thereby grinding, and optionally by adjusting the dispersion to the desired content with further dispersant, It has a 30 to 75% by weight of solids content relative to the total amount of liquid, and a dispersion of zirconium dioxide having a median diameter of particle size distribution of less than 200nm dispersion. This dispersion can be used for the production of ceramic layers, membranes and molded articles. |