Strategies for the Development of Environmental Barrier Coatings for High-Temperature Applications

Ceramic coatings provide an excellent protection of components, which are applied in harsh environments. They can withstand high temperatures and corrosive media and form an excellent barrier against reactive molecules and heat. Due to complex requirements, multiphase and multilayer coating systems are devel-oped. A systematic approach for material selection as well as microstructure-, layer-and process design is required to achieve optimum performance of the coatings. This approach is outlined in the present paper. It is demonstrated in the development of an environmental barrier coating system.