Leibniz-institut Fuer Neue Materialien Gemeinnuetzige Gmbh

Buhler Partec Gmbh

Kai Gossmann

Helmut Schmidt

Ralph Nonninger

Robert Drumm

Frank Tabellion

Christian Goebbert

Jens Adam

Karl-Peter Schmitt

A method for producing a functional colloid during which particles are reactively fragmented in a mechanical manner in a dispersant in the presence of a modifying agent so that the modifying agent is chemically bound, at least in part, to the fragmented colloid particles.

Chemomechanical production of functional colloids

Nanoscale corundum powders are obtained by first producing an AlOprecursor by adding seed crystals to an aqueous solution of an aluminium compound and adding a base and then converting the AlOprecursor into corundum by calcination at a high temperature. Before the calcination, the salts that are present in addition to the AlOprecursor are separated off. The resulting product is calcined at temperatures of 700 to 975&#xb0; C. and any fines that may be present are removed. The resulting corundum powders can be sintered at temperatures of &#x2266;1200&#xb0; C. to produce compacts or components of multiple layer systems.

Nanoscale corundum powders, sintered compacts produced from these powders and method for producing the same

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Saarbrücken, Germany

Kai Gossmann