La–Sr–Fe–Co oxygen transport membranes on metal supports deposited by low pressure plasma spraying-physical vapour deposition

Dense La0.6Sr0.4Fe0.8Co0.2O3−δ (LSFC) membranes were successfully prepared on NiCoCrAlY metal supports by low pressure plasma spraying-physical vapour deposition. He leakage rate tests and microstructural analysis by SEM of the as-deposited films showed that a gas-tight membrane layer is achieved. Membrane thicknesses are between 40 and 65 µm. The oxygen permeation flux was determined at atmospheric pressure in an air-Ar gradient at different temperatures between 700 and 950 °C and compared with 1 mm thick LSFC pellet. Although leakage was detected, noteworthy oxygen permeation rate of the supported membranes (∼0.3 ml cm−2 min−1 at 885 °C) is reported.