Corrosion of Potential First Stage Blade Materials in Simulated Supercritical CO₂

Global power consumption is predicted to double by 2050, notably driven the transportation and energy sectors necessitating limitations of emissions. Due its compact turbomachinery, better thermal efficiency, simpler layout, supercritical-CO2 cycles have received attention, with numerous variations proposed (either indirect-fired/closed or direct-fired-open cycles). One technical challenge degradation pathway quantification turbine materials in sCO2 as selection crucial successfully economically operate new plants. This requires assessment representative environments simulating Allam cycle. Laboratory tests were conducted on a first stage blade alloy, CM247, either an environmentally resistant coating bond coat/thermal barrier coat at one atmosphere 800°C, potential exposure including (O2, H2O, N2, SO2) for up 1000 h. Weight change metallographic measurements tracked scale development. Scanning electron microscopy/energy dispersive X-ray spectroscopy studied scales internal precipitates. Locations contaminant element CO2-rich environment investigated.