A Review Paper On Thermal Barrier Coatings (TBC) To Improve The Efficiency Of Gas Turbine

Gas Turbine are widely used for aircraft propulsion. To increase the efficiency of gas turbine inlet Temperature should be high as possible. The turbine inlet temperature in modern gas turbines are far above the permissible metal temperature. This in turn increases thermal loading to the blade leading to high temperature and thus considered one of the primary sources of blade failure. So that thermal barrier coatings are need to improve for insulation. The TBC must provide significant thermal insulation at the external surface of the turbine blade. for a given Superalloy substrate, the coating performance is dependent upon the type of bond coat. Conversely, for a given bond coat, the performance becomes a function of the Superalloy composition used in the application. To achieve the best TBC performance for a given application, it is important to select the bond coat/superalloy combination as a composite system rather than as separate entities. so by applying TBC efficiency of the gas turbine increase and also the life of the turbine blade also increase.