The oxidation behavior of wrought and dispersion-strengthened alumina-forming FeCrAl
and Fe-Al alloys was evaluated in a CO2-H2O atmosphere at 1100°C. This environment
simulates a potential future high temperature oxy-fired superheater condition. Alumina-forming
alloys typically perform better than chromia-forming alloys in the presence of water vapor and
high carbon activities at high temperature. However, under these conditions, a significant
increase in scale exfoliation and oxidation rate was observed compared to similar exposures in
ambient air. Additional characterization is needed to understand these observations.
Keywords: Oxy-fired boilers, alumina-forming alloys, oxide dispersion strengthened alloys,
scale spallation, CO2, H2O