Phase Relationships in the Cr‐Li‐K‐C‐O System at 650°C

Abstract

The reaction of chromium with melts was investigated from a thermodynamic point of view. Thermochemical calculations with the SOLGASMIX‐PV computer program were used to establish equilibrium phase relationships for the Cr‐Li‐K‐C‐O system at 650°C. The calculated phase relationships were checked experimentally by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results of TGA and DTA were self‐consistent with respect to the reaction products predicted from the calculated phase stability diagrams. Finally, the phase stability diagrams of the Cr‐Li‐K‐C‐O system were used as an aid in understanding the corrosion processes of chromium in molten carbonate salt under both fuel gas and oxidizing gas used in molten carbonate fuel cells.