Water‑oxygen corrosion and thermal shock behavior of a single-layer Yb-Al-Si-O glass-ceramics environmental barrier coating on SiC_f/SiC at 1350 °C

High-density and high-strength SiC_f/SiC composites were obtained utilizing CaO-Yb₂O₃-Al₂O₃-SiO₂ (CYbAS) glass-ceramics for matrix modification, alongside Yb₂O₃-Al₂O₃-SiO₂ (YbAS) glass-ceramics for environmental barrier coating (EBC). The durability of the single-layer YbAS coating was evaluated by assessing its resistance to water‑oxygen corrosion and thermal shock, in order to ascertain its potential as an advanced EBC. The results indicated that the YbAS coating significantly reduced the growth rate of thermally grown oxide (TGO) in a 50 vol% H₂O-50 vol% O₂ environment at 1350 °C. Additionally, a water-cooled thermal shock test conducted in air at 1350 °C revealed no evidence of penetrative cracks or TGO formation within the coating. These results underscore the potential application of YbAS coating in high-temperature corrosive environments.