Dissolution corrosion of 4H-SiC in lead-bismuth eutectic at 550 degrees C

摘要

The corrosion behavior of 4H-SiC in lead-bismuth (Pb-Bi) eutectic (LBE) at 550 degrees C is investigated. To clarify the effect of irradiation damage on corrosion, samples with and without Si5+ ion irradiation are contrastively evaluated. The main results show that dissolution corrosion occurs in both unirradiated and irradiated samples, while the irradiation damage can accelerate the corrosion rate. The corroded surface is characterized by the loss of C element and the formation of amorphous layers with a slight enrichment of Si atoms. The possible reasons are discussed.