Didier-werke Ag

Werner Richter

Ernst Luhrsen

Peter Jeschke

Siegfried Pohl

Ortwin Rave

Martin Kienow

A refractory article for casting of liquid melts, especially steel, fabricated from a mixture of Al.sub.2 O.sub.3, graphite, a flux component, a synthetic resin binder and a metallic powder. The flux component contains a first flux with a melting point from 550.degree. to 900.degree. C. and a second flux that becomes active in the mixture in a temperature ranging from 1350.degree. and 1550.degree. C. The refractory article need not be heated before use, and the carbon contained therein, which determines the strength of the article, is retained for a much longer period during use, so that the article will have a long service life.

Refractory article suitable for casting molten metal

A refractory immersion spout includes a spout member having an upper portion and a lower portion. The spout member has a pouring channel and outlet openings extending laterally from the pouring channel. A refractory sleeve covers the outer surface of at least a portion of the lower portion of the spout member. The spout member comprises an extrusion product resulting from the extrusion of a material including 30-75% alumina and 10-30% carbon, with the carbon being aligned longitudinally of the spout member as a result of the extrusion. The sleeve comprises an isostatically compressed member formed of a highly refractory material. The thickness of the lower portion of the spout member is less than the thickness of the upper portion of the spout member, such reduction in thickness resulting from a reduction of the outer size of the spout member. The sleeve is cemented onto the outer surface of the lower portion of the spout member by an alumina-rich refractory cement.

Growing community of inventors

Krefeld, Germany

Werner Richter