Schott Ag

Karsten Von Westernhagen

Manfred Borens

Stefano Merolla

Stefan Postrach

Gerald Wasem

To provide a material for use at high temperatures of several 100&#xb0; C. which is simple and quick to produce, the invention provides a composite having a layer structure and a process for producing it, which comprises the following steps:

Layer material for high-temperature use

A process is disclosed for simple and rapid production of a shaped body comprising fused silica and a shaped body which leads to virtually no contamination of a melt in contact with the shaped body even at high temperatures. The disclosed process comprises the steps of: a) provision of fused silica in the form of essentially amorphous SiOgrains of which not more than 5% have a diameter greater than 15 mm, b) addition of water to the fused silica grains to produce a slip, c) casting of the slip into a mold which comprises a hollow body having the inverse shape of the shaped body to be produced, and d) drying of the slip to give an intermediate body, which is then sintered and cooled. A shaped body producible in accordance with the aforementioned process is also disclosed, which comprises at least 99.0 mol % of SiO.

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Mainz, Germany

Karsten Von Westernhagen