Abstract No.:
7189

 Scheduled at:
Wednesday, June 22, 2022, Saal Brüssel 4:00 PM
Joining of glass, ceramics and metals


 Title:
Joining behavior of glass composite sealant for oxygen transport membrane application

 Authors:
Xinfang Li* / Forschungszentrum Jülich GmbH, Germany
Sonja Gross / Forschungszentrum Jülich GmbH, ZEA-1, Germany
Thomas Koppitz/ Forschungszentrum Jülich GmbH, ZEA-1, Germany
Ghaleb Natour/ Forschungszentrum Jülich GmbH, ZEA-1, Germany

 Abstract:
Ceramic oxygen transport membrane (OTM) is a functional reactor medium to produce synthesis gas from carbon fuels and possibly capture CO2 from exhaust gas. Sealants are needed to assemble OTM with support metal to modules in industrial process. Glass H based on main composition BaO-CaO-SiO2 commonly was used as elevated temperature sealant. In this study, glass-ceramic composite sealant H87BS30 was investigated by adding 30 wt.% BaO·SiO2 (BS) filler and mixing with glass H in order to increase the composite thermal expansion coefficient (CTE). Dilatometric test was measured and compared CTE of this composite with membrane and support metal. The viscosity behavior of glass-based sealant was explored by thermooptical microscopy to investigate optimal joining temperature. The sealing behavior was analyzed with SrTi0.75Fe0.25O3-? (STF25) as OTM materials and two support metals, which were ferritic alloys Crofer 22 APU and Aluchrom in as-delivered and pre-oxidized condition. Helium gas-tightness measurements were carried out for sandwiched samples joined by composite sealant under different heating programs. Leaking samples were inspected by ink penetration and optical microscopy. The analysis of X-ray Computed tomography (CT) was employed to non-destructively check the inner joining conditions of glass sealant between support metals and STF25, and cross-sections of the joints were analyzed by scanning electron microscopy (SEM).

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