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Title
Offenzellige Schaumkeramik mit hoher Festigkeit und Verfahren zu deren Herstellung
Date Issued
2001
Author(s)
Adler, J.
Standke, G.
Teichgräber, M.
Patent No
1996-19621638
Abstract
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.
Language
de
Patenprio
DE 1996-19621638 A: 19960530