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Offenzellige Schaumkeramik mit hoher Festigkeit und Verfahren zu deren Herstellung

Open-celled foamed ceramic with increased strength - by filling ceramic bridges with metal or ceramic.
: Adler, J.; Standke, G.; Teichgräber, M.

Frontpage ()

DE 1996-19621638 A: 19960530
DE 1996-19621638 A: 19960530
EP 1997-927088 AW: 19970530
WO 1997-EP2828 A: 19970530
DE 19621638 A1: 19971204
EP 907621 B1: 20010411
Patent, Elektronische Publikation
Fraunhofer IKTS ()

A novel high strength, open-celled foamed ceramic has the internal cavities, cracks and porosity of the ceramic bridges completely or partially filled with one or more metallic and/or ceramic phases. Also claimed is a process for producing the above foamed ceramic by applying an aqueous ceramic particle suspension to an open-celled polymer foam, burning off or pyrolysing the polymer foam and then sintering, the internal cavities, cracks and porosity of the ceramic bridges of the sintered foamed ceramic being completely or partially filled, during or after sintering, with a melt or suspension of materials which melt below the foamed ceramic melting temperature, have a similar expansion coefficient to that of the foamed ceramic, have good wetting properties and have no or only partial tendency to react with constituents of the foamed ceramic. When a filling suspension is used, the filled ceramic is heated to above the melting temperature of the suspended materials or their reaction produ cts. USE - E.g. as a deep filter, filtration support body, heat exchanger, regenerator, electrically heated thermostat, catalyst support, radiant burner element, high temperature reaction chamber, sound absorber or stiffening material for high temperature panels. ADVANTAGE - The process provides simple and inexpensive strength increase of the foamed ceramic, while the resulting foamed ceramic has a very uniform structure wrt. cell size and bridge thickness, is open-celled and is useable at up to near the melting temperature of the filling phase.