In world wide efforts processes are in development for coal or gas combustion with an additional capturing of CO₂ exhaust gas for storage in the underground. Most efficiency is expected by burning in a nitrogen free atmosphere. The oxygen needed for the combustion shall be delivered by so called Oxygen Transport Membranes (OTM) in the combustion process. Perovskite type ceramics with mixed ionic and electronic conductivity at high temperatures can be used as membrane materials.

With improving the oxygen ion conductivity other relevant material properties became critical in particular chemical stability and mechanical strength. The ceramic membranes must be joint gas tight to metal housings and work at 800 – 1000 °C. Concentrating on tubular membranes material behaviour of BSCF-Perovskite will be described as basis for optimization joining techniques and module design. Experimental data for Reactive Air Brazing, Glass soldering and gluing in cold surrounding will be presented and discussed as well as different module concepts.

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1. Sintering of Ba_0,5Sr_0,5Co_0,8Fe_0,2O_3-φ Perovskite, the (Grain) Boundary Between Functional and Mechanical Properties?