Investigation of alkali induced corrosion of SiC filter candles at high temperature, in gasification environment

The corrosion of silicon carbide filter candle material by alkali species (NaCl and NaOH) vapours was systematically investigated from 800 °C to 1400 °C in a gasification like atmosphere (He/H2 (4 vol%)/H2O (4 vol% and 8 vol%)). Inline hot gas analysis was done by molecular beam mass spectrometry (MBMS). The results of the experiments verify proposed SiC corrosion mechanisms from the literature and propose advanced reaction mechanisms with regard to alkali metal species.