Blades, stationary (nozzles) and moving (turbine), are the most important critical elements of turbine engine structure. They are exposed to large temperature differences between exhaust and the air that cools them. In this case, the ones under the greatest loads are first degree stationary blades, as they are affected by gases flowing directly from the combustion chamber. The thermal stress occurring in the blade material is the greater, the greater the difference between exhaust gas and cooling air temperatures. Turbine blades that participate in transforming the kinetic energy of exhaust gases into rotational movement energy are additionally loaded with centrifugal force.