Method for producing monolithic, porous, ceramic shaped bodies

US6753282B2 · kind B2 · utility

Assignee

• TAMI Deutschland GmbH · DE

Inventors

• Thomas Fleischmann · Laufen, DE
• Heike Kastner · Bad Birnbach, DE

Key dates

• Filing date: Sep 9, 2002
• Grant date: Jun 22, 2004
• Expiry date: Sep 17, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249971
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing a monolithic, porous, ceramic shaped body and to the shaped bodies produced according to this method. Said shaped body is used predominantly as a support material for porous, inorganic and/or organic membranes for the flow filtration of liquids and gases. The aim of the invention is to provide a method for producing a shaped body consisting substantially of TiO2 with an open porosity >10%, an average pore size of between 1 and 50 &mgr;m and a mechanical stability >20 N/mm2. To achieve this, a first TiO2-powder fraction is pre-sintered at temperatures >1200&deg; C. and subsequently ground to achieve a screening refuse of at least <5% for grain sizes of less than 100 &mgr;m, at least an additional TiO2 powder fraction, whose grain size is significantly smaller than that of the first powder fraction, is added to and mixed with the granulate and the mixture obtained is compressed into a shaped body which is subjected to an additional sintering process at temperatures that are >1100&deg; C. but lower than the first sintering temperature.