Research on High-Temperature Performance of CoCrAlSiY Coatings

This work investigates the high-temperature oxidation kinetics of CoCrAlSiY coatings with different Si concentrations. Hot-corrosion resistance is determined at 800 and 900 °C via hot salt coating, thermal shock resistance is measured at 1050 °C, and the oxidation and corrosion products are analyzed through mineralogical and micro analysis. The results show that Si promotes the formation of an Al₂O₃ film that improves oxidation and corrosion resistance, but excessive amounts reduce thermal shock resistance.