success-of-cooled-turbine-blade-typesConvection andfilm coolingEffusion coolingConvection coolingand thermal barriersCeramic shirt andconvection-cooledcore Current materials:Ni-alloys: - Non-directional polycrystal - Directional polycrystal - Single crystalMetal meshwelded to blade Ceramic coating - spray coating - PVD coatingCeramic shirt made from monolithic ceramic (e.g. SiC)Future materials: - Oxide dispersion strengthened (ODS) - Intermetallic phases (IP)There are several plausible variation types of cooledturbine blades. To date, only two of them have managed to prove themselves. Proven in yearsof serial operationOnly prototypetestingIn serial operationOnly analyzed aslaboratory sample