A REVIEW ON THERMAL BARRIER COATINGS ON GAS TURBINE ENGINE BLADES AND VANES

Abstract

Thermal barrier coatings (TBC) are highly sophisticated materials systems commonly applied to metallic surfaces, such as on gas turbine or aero-engine components, working at excessive temperatures, as a kind of exhaust heat control. Thermally insulating materials that can maintain a noticeable temperature differential between the load-bearing metals and the coated surface are used in these coatings to protect components from heavy and extended heat loads. [1] In \sdoing so, these coatings may allow for greater operating temperatures while minimising the heat exposure of structural components, increasing part life by lowering oxidation and thermal fatigue. In combination with active film cooling, TBCs allows working fluid temperatures greater than the melting point of the metal airfoil in certain turbine applications.