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Joining of ceramic Ba0.5Sr0.5Co0.8Fe0.2O3 membranes for oxygen production to high temperature alloys

: Kiebach, Ragnar; Engelbrecht, Kurt L.; Kwok, Kawai; Molin, Sebastian M.; Søgaard, Martin; Niehoff, Patrick; Schulze-Küppers, Falk; Kriegel, Ralf; Kluge, Jens; Hendriksen, Peter Vang


Journal of membrane science 506 (2016), pp.11-21
ISSN: 0376-7388
ISSN: 1873-3123
European Commission EC
Highly Efficient Tubular Membranes for Oxy-Combustion
Journal Article
Fraunhofer IKTS ()
brazing; BSCF; carbon capture and sequestration; joining ceramic to metal; oxygen transport membrane

The possibility of joining dense ceramic BCSF tubular membranes to metal alloys using a silver braze was investigated. Four different alloys (Crofer 22 APU®, Kanthal APM®, Haynes 214® and EN 1.4841) were considered and the influence of their oxide scale stability/reactivity and their thermal expansion coefficient on the stability of the final joint was evaluated. Leak tight assemblies were obtained only for steels with a thermal expansion coefficient of >16 [10-6 K-1] and protective coating. Proof-of-concept oxygen flux measurements up to 830 °C were performed on these assemblies, demonstrating the functionality of the developed hot sealing. In addition a simulation of the stresses occurring in the joint assembly during use was performed for different materials and geometries. The obtained results fit well with the experimental findings.