Evonik Degussa Gmbh

Evonik Roehm Gmbh

Evonik Rohm Gmbh

Evonik Goldschmidt Corporation

Evonik Operations Gmbh

Tadeusz Von Rymon Lipinski

Peter Neugebauer

Dirk Poppe

Bruno Keller

Frank Beissmann

Ruth Kernke

Stefan Silber

Christoph Batz-Sohn

Wolfgang Lortz

Thomas Ebbrecht

Bernd Weyershausen

Christoph Tontrup

Frank Beißmann

The present invention relates to a novel process for producing ceramic materials, in particular refractory materials having a reduced relative density. In particular, the invention relates to a process for producing light, refractory materials having non-contiguous pores based on shaped and unshaped materials. These materials can be used as working lining in high-temperature applications. The process is based on the production of spherical, closed and isolated pores in the microstructure of the material. The pores having a pore diameter which can be set in a targeted manner are generated by use of polymer particles, in particular polymethacrylates, in particular polymers or copolymers prepared by means of suspension polymerization, as pore formers which can be burnt out. The polymers or copolymers are present in the form of small spheres having a defined diameter. The introduction of isolated spherical pores allows the production of ceramic materials having a sometimes significantly reduced relative density and improved corrosion resistance and better mechanical strength compared to the prior art. The specific, closed pore system at the same time contributes to reducing the thermal conductivity of the ceramic materials. In addition, the novel process has the advantage that there is no risk of formation of undesirable black cores, even in the production of thick-walled ceramic products.

Method for producing light ceramic materials

A reactive liquid ceramic binder suitable for the production of ceramic products from ceramic powders is provided. The reactive liquid ceramic binder contains organo-modified siloxane compounds, wherein the liquid organo-modified siloxane compounds contain organoalkoxysiloxane units according to general formula (I) wherein

Reactive liquid ceramic binder resin

Preparation for producing refractory materials, characterized in that it comprises one or more particulate, refractory components and one or more binders, where&#x2014;the particulate, refractory component has a mean particle diameter of &#x3e;0.3 m and&#x2014;the binder is selected from among&#x2014;from 0.05 to 50% by weight of a very finely particulate binder having a mean particle diameter of from 10 nm to 0.3 m selected from the group consisting of aluminum oxide, titanium dioxide, zirconium dioxide and/or mixed oxides of the abovementioned oxides, &#x2014;from 0 to 20% by weight of an inorganic binder, from 0 to 20% by weight of a hydraulically setting binder, &#x2014;from 0 to 15% by weight of an organic, silicon-free binder&#x2014;and the preparation additionally contains from 0 to 35% by weight of water, where&#x2014;the proportion of the particulate, refractory component is equal to 100 and the percentages of the further materials in the preparation are based on the particulate component.

Preparation for producing refractory materials

Growing community of inventors

Bonn, Germany

Tadeusz Von Rymon Lipinski