The water vapour hot gas corrosion of ceramic materials

The water vapour hot gas corrosion behaviour of ceramic materials was investigated. Structural ceramics (Si3N4, SiC, Al2O3 and Al6Si2O13) and various oxide materials, which are in discussion as potential EBC / TBC coatings, show a variety of corrosion recession rates and kinetic effects. The tests were performed in a high temperature burner rig under gas turbine like conditions at 1450 °C, a total pressure of 1 atm with a water vapour partial pressure of 0.28 atm, a gas flow velocity of 100 m/s with corrosion exposure times up to 800 hours. The results of the material screening are compiled to a corrosion recession map. Different types of corrosion kinetic behaviour are exemplary illustrated for selected materials. Finally the application of corrosion stable oxide materials as EBC coatings for alumina based ceramics (CMCs) is demonstrated