Single Crystal Blade for a Gas Turbine Engine : A Review of the Characteristics and Recent Research Trends for Thermal Barrier Coating

This paper reviews the thermal barrier coatings (TBCs) for recent superalloy turbine blades produced by various techniques. Single-crystal turbine blades, which were recently introduced to enhance engine efficiency levels, with TBCs on the bond coats for application to turbine components are examined. To reduce the thermal conductivity of the blades for an improved function of the TBC, various parameters reported in recent papers, such as materials and processes for coatings, applications, durability issues, technical approaches and progress toward improved TBCs are introduced. The most recent research reports for new bonds with different compositions, thermal properties and void morphologies for longer lifetimes with delayed failure times and enhanced TBCs are explained. A suggestion is proposed for a strategy in the domestic research field for superalloys.