Siemens Aktiengesellschaft

Evonik Degussa Gmbh

Technische Universität Bergakademie Freiberg—institut Für Keremik, Glas-und Baustofftechnik

Uwe Klippel

Christos Georgios Aneziris

Holger Grote

Christoph Tontrup

Friederike Lange

Nora Gerlach

Stefan Schafföner

Harm Speicher

A pressure casting slip for producing a refractory ceramic for use as a heat shield, e.g. in the hot gas path of gas turbine units, includes a particulate mixture of at least two materials having different coefficients of thermal expansion and also organic and/or inorganic binders and floating agents. The particulate mixture has a multimodal particle size distribution divided into 10-20 percent by weight of coarse particles in the size range 1-5 mm in diameter, 10-20 percent by weight of medium particles in the size range 0.5-1 mm in diameter and 60-80 percent by weight of fine particles in the size range up to 0.5 mm in diameter which together make up 100 percent by weight of the particle mixture.

Pressure casting slip and refractory ceramic produced therefrom for gas turbine units

Mix which comprises a) one or more very finely divided silicon dioxide powders having an average particle diameter of from 2 to 100 nm and a BET surface area of at least 30 m/g, b) one or more particulate components selected from the group consisting of oxides, carbides and nitrides, in each case having an average particle diameter of from &#x3e;0.5 &#x3bc;m to 30 mm, c) one or more synthetic resins as binders and d) one or more metallic antioxidants having an average particle diameter of from &#x3e;0.5 to 250 &#x3bc;m. Process for producing a shaped body, in which to the mix is introduced into a mould, pressed if appropriate and heated to a temperature at which the synthetic resin crosslinks thermally. Shaped body which can be obtained therefrom. Process for producing a refractory shaped body, in which the shaped body is carbonized. Refractory shaped body which can be obtained therefrom.

Mix and refractory product having a high hydration resistance produced therefrom

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L'Isle d'Abeau, France

Uwe Klippel