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

Fraunhofer-ges. Zur Förderung Der Angewandten Forschung E.v.

Jörg Adler

Andreas Langsdorf

Norbert Greulich-Hickmann

Reinhard Lenk

Hans-Jürgen Richter

Michael Piwonski

Heike Heymer

Gisela Standke

Peter Thieme

Thomas Schicht

The invention relates to a method and device for non-contact molding of fused glass or glass ceramic gobs by means of gas levitation, comprising the following method steps: a pre-form is generated, the pre-form is brought close to a molding tool, which may be connected to a compressed gas source on the open-pored region thereof facing the pre-form in order to generate a gas cushion between the molding tool and the pre-form and the molding tool is directly heated at least during a part of the molding phase.

Method and device for non-contact moulding of fused glass gobs

The invention relates to the area of ceramics and to ceramic multilayer filters, such as used for separating gases. The invention provides ceramic multilayer filters which are more economical to produce. To this end, the inventive ceramic multilayer filters include at least two layers of different particle size, the particle surfaces of all of the ceramic particles being completely or partially perfused with a material and spot and/or surface joints being formed between particles. The invention also provides a method for producing ceramic multilayer filters of this type, according to which slips are produced from at least two ceramic powders of different particle size, the particles of the ceramic powders being perfused with a material or a material in powder form being added to the ceramic slips. One or more layers are formed from the slips and then dried. At least two layers are placed one above the other and/or joined to each other and together are subjected to a temperature increase.

Ceramic multilayer filters and method for producing the same

The invention relates to the field of ceramics and open-celled silicon carbide foam ceramics, which can find application, for example, as high temperature- and thermal shock-resistant silicon carbide foam. The aim of the invention is to disclose an open-celled silicon carbide foam ceramic with improved thermal shock resistance, which may be produced by a simple method. Said aim is achieved with an open-celled silicon carbide foam ceramic, the structure of which is made up of sintered silicon carbide with a 5 to 30% pore volume of closed pores with an average diameter of &#x3c;20 &#x3bc;m. The invention further relates to a method for the production of an open-celled silicon carbide foam ceramic, whereby coarse and fine silicon carbide powder in the ratio 20:80 to 80:20 parts are mixed and a suspension produced therefrom. An open-celled foam or open-celled network is then coated with said suspension, the foam or network material removed and sintering carried out at a temperature of &#x3e;1800&#xb0; C. under a protective atmosphere or in vacuo.

Open-celled silicon carbide foam ceramic and method for production thereof

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Meissen, Germany

Jörg Adler