 Turbine efficiency is strongly correlated with combustion temperature.Higher temperature combustion improves the thermodynamic efficiency of the machine, giving a more favourable ratio of work generated in relation to waste heat.Thermal barrier coatings are commonly used to protect nickel-based superalloys from both melting and thermal cycling in aviation turbines.Combined with cool air flow, TBCs increase the allowable gas temperature above that of the superalloy melting point.