Foseco International Limited

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Reinhard Stoetzel

Helmut Jaunich

David L Jones

Joerg Adler

Gisela Standke

Wolfgang P Kaettlitz

Michael Teichgraeber

Martin S Swift

Heike Stoever

The disclosed invention relates to the field of ceramics and concerns an open-cell expanded ceramic which may be used in the form of a deep-bed filter, and a process for the production thereof. The primary object is to produce an open-cell expanded ceramic by a simple and economical process. This object is attained by an open-cell expanded ceramic in which the inner cavities, cracks and the porosity of the ceramic members are filled partially or completely by one or a plurality of metal and/or ceramic phases and/or glass phases. The open-cell expanded ceramic is also produced in that during or after sintering the cavities, cracks and the porosity of the ceramic members are partially or completely filled with a melt or a suspension which melt below the melting temperature of the expanded ceramic, have a coefficient of expansion similar to the coefficient of expansion of the expanded ceramic, and a very good wetting capacity, and only react partially or not at all with constituents of the expanded ceramic.

Open-cell expanded ceramic with a high level of strength, and process for the production thereof

Filters for light metals

Filters for filtering molten light metals comprise a reticular foam having a composition comprising graphite, wollastonite, silica and an alkali phosphate glass. The filters have a low hardness and can readily be machined accurately from large pieces of the filter material. In a preferred embodiment the exterior surfaces of the large pieces of filter are coated with a composition comprising graphite and a binder prior to firing and then machined.

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Borken, Germany

Reinhard Stoetzel