Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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molybdenum oxide exist but most are either liquid or gaseous at 1000oC, allowing their migration to cooler regions of the containment tube. They, therefore, may not be present in this sample which was in the hot zone of the furnace.) Summary and Conclusions on the Corrosion Behavior of I-617 in Supercritical CO2 – At short exposure times I-617 exhibits a corrosion rate lower than that of either coarse- or fine-grained MA 754. The tightly adhering corrosion product appears to be composed mainly of chromium oxide which is thermodynamically stable at 1000oC in the presence of CO2. However, unlike MA 754, significant intergranular corrosion is observed in I-617 even at relatively short exposure times. Longer exposures may result in large pieces falling out of the surface and a breakdown in the protective aspect of the corrosion layer, allowing rapid corrosion. Although nothing in this study would suggest that this alloy is unfit for service in a supercritical CO2 Brayton cycle, it is imperative that long term corrosion studies be carried out to fully document the corrosion behavior of I-617 in supercritical CO2 at temperatures approaching 1000oC. 75

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