Effect of pressure on high-temperature oxidation of Ni alloys in supercritical CO2 containing impurities
Source abstract
Abstract
Direct supercritical CO 2 (sCO 2) power cycles require structural materials compatible with hot sCO 2 containing high levels of water and oxygen impurities. Chromia-forming Ni-based superalloys, which are leading candidates at temperatures > 600 °C, have shown good compatibility in pure sCO 2, however potential impurity effects are not well understood. Herein we exposed several commercial Ni-based alloys to 95%CO 2-4%H 2O-(1−3)%O 2 at 750 °C and 0.1 or 20 MPa for 2500 h. Protective chromia scales formed in all cases. Nevertheless, water vapor-assisted oxide volatilization clearly occurred at high pressure. The volatilization rates decreased with time, but still represent a potentially serious compatibility issue in real, high-velocity, sCO 2 systems.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advancements in Solid Oxide Fuel Cells · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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