Abstract
Abstract Perovskite-type La0.6Sr0.4Co0.8Fe0.2O3 − δ (LSCF) oxygen transport membranes were successfully deposited on porous austenitic stainless steel by SAPS. A performance comparison between SAPS membrane and the one prepared by the reported PS-PVD was carried out. X-ray diffraction (XRD) result demonstrates that the degree of perovskite crystallinity of the PS-PVD membrane is better than that of the SAPS membrane. However, scanning electron microscope (SEM) and gas-tightness measurement results indicate that the SAPS membrane shows a much denser microstructure than that of the PS-PVD membrane. The thermal stability result reveals that some vertical through cracks appears on the PS-PVD membrane, while no obvious vertical cracks can be observed on the SAPS membrane. Then the oxygen permeation flux through the membranes was measured under high temperature (700 °C and 900 °C). It is found that the oxygen permeation flux through the PS-PVD membrane is higher than that of the SAPS membrane. Further studies demonstrate that the oxidation of porous metallic substrates greatly decrease the oxygen permeation flux.
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