Gas Turbine Thermal Barrier Coating

A second type of coatings applied to high temperature parts are known as thermal barrier coatings tbc.

Gas turbine thermal barrier coating.

Tbcs which comprise metal and ceramic multilayers insulate turbine and combustor engine components from the hot gas stream and improve the durability. As already stated above the power to weight ratio and efficiency of gas turbine engines are limited to the burn temperature they can run at which is caused by the limit of suitable materials available to use in a turbine engine if the burn temperature is raised at to high a temperature then the rotor and stator blades will melt. The thickness of the zirconia required depends upon the gas stream temperature and the amount of cooling available. Of all these thermal barrier coatings tbcs have the most complex structure and must operate in the most demanding high temperature environment of aircraft and industrial gas turbine engines.

Functionally graded materials 1996 1997. Despite being typically 1 5 mm thin the allow for a drop of 100 300 o c between the gas and metal surface temperatures. Failure mechanisms and key microstructural features recubrimientos de barrera térmica para aplicación en turbinas a gas. Universidad nacional de colombia medellín colombia jdosorio unal edu co.

Thermal barrier coatings tbcs are advanced materials systems usually applied to metallic surfaces operating at elevated temperatures such as gas turbine or aero engine parts as a form of exhaust heat management these 100 μm to 2 mm thick coatings of thermally insulating materials serve to insulate components from large and prolonged heat loads and can sustain an appreciable temperature. Thermal barrier coatings for gas turbine applications. Coatings for combustion liners are normally specified by the turbine manufacturer. Thermal spray coatings for industrial gas turbines produce substantial benefits.

These coatings can be applied to a thickness of 2 mm although typical thickness is in the range of 0 2 mm to 0 5 mm. These are ceramic coatings with very low thermal conductivity. The use of tbcs 100 to 500 μm in thickness along with internal. Thermal barrier coatings tbcs are widely used in hot sections of gas turbine engines to improve their operating temperature and provide thermal protection for the underlying metallic components thereby improving the efficiency and performance of the engine.

Thermal barrier coatings tbcs are widely used in some components of the commercial gas turbine engines including the combustion chambers the nozzles and the blades to control the high heat flux entering from the combustion gas to the structural components.