Document Type
Article
Abstract
Oxygen transport membrane (OTM) is an economic technology for oxygen separation and high-purity oxygen production. To mitigate various issues induced by high temperatures, intermediate temperature OTM technology has been pursued in recent years. However, in certain circumstances, high operating temperatures are unavoidable, such as in situ oxygen production using OTMs for direct oxy-combustion. Nevertheless, the lack of reliable high temperature gas-tight sealing imposes great challenges on OTM technology for such applications. Herein, a novel sealing strategy is developed to obtain a gas-tight bonding/sealing of two different bulk ceramics using ceramic slurry in combination with phase inversion process. The sealing strategy is successfully applied to a model material system of alumina supporting tube-La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) hollow fiber-alumina supporting tube assembly. The utilization of LSCF as the sealing material allows operating temperatures of OTM assembly up to 1200°C, the sintering temperature for LSCF hollow fiber fabrication. A significant enhancement in oxygen flux is revealed at ultra-high temperatures (> 1000°C). Long-term durability and thermal cycling tests demonstrate the excellent robustness and stability of the sealing. This work provides a general sealing strategy for OTM technology upscaling and robust operation in wide temperature conditions.
Digital Object Identifier (DOI)
Publication Info
Published in Applied Ceramic Technology, Volume 23, Issue 1, 2025.
Rights
© 2025 The Author(s). International Journal of Applied Ceramic Technology published by Wiley Periodicals LLC on behalf of American Ceramics Society.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
APA Citation
Wang, G., & Xue, X. (2025). A gas‐tight bonding/sealing of different bulk ceramics for robust oxygen separation at ultra‐high temperatures. International Journal of Applied Ceramic Technology, 23(1). https://doi.org/10.1111/ijac.70103