Corrosion-resistant materials for liquid LiPb fusion blanket in elevated temperature operation

The corrosion tests of CVD-SiC, FeCrAl alloy (APMT, Fe-22Cr-5Al) and ODS FeCrAlZr alloy (NF12, Fe-11.6Cr-6.2Al) were performed in liquid LiPb up to 1173 K for 250 h. High-purity LiPb was synthesized by melting and mixing of Pb and Li granules at 623 K under vacuum condition. CVD-SiC revealed corrosion resistance, though SiC chemically reacted with impurities dissolved in liquid LiPb and formed complex oxides. The α-Al2O3 layer which was formed on the surfaces of the FeCrAl alloys by the pre-oxidation treatment chemically reacted with liquid LiPb at 1023 K and 1173 K, and the layer chemically transformed into γ-LiAlO2.