Steam corrosion behavior of rare earth multi-component glass ceramics modified SiC_f/SiC composites

In this work, SiC_f/SiC composites are modified by (Y_0.25Yb_0.25Er_0.25Ho_0.25)₂Si₂O₇ ((4RE_0.25)₂Si₂O₇), and compacted by RE₂O₃-Al₂O₃-SiO₂-B₂O₃-Cr₂O₃ glass (or simply RBCAS glass. RE=Y, Yb, Er, Ho, equimolar ratios), which can separate out mullite and (4RE_0.25)₂Si₂O₇ after infiltration. After being corroded in steam environment for 100 h at 1300 ºC, the internal morphology of modified SiC_f/SiC composites remained excellent stability due to the blocking effect of the modified phase. In particular, there is no new phase was formed in the modified matrix of SS-R and SS-HR composites, only the (4RE_0.25)₂Si₂O₇ and mullite crystals grew. The strength retention rate of modified SiC_f/SiC composites after high-temperature steam corrosion was about 82.8 %, which is higher than that of SiC_f/SiC composites prepared by CVI process (70.7 %). This rare earth multi-component microcrystalline glass has excellent resistance to steam corrosion and can be used as modified material of SiC_f/SiC composites.