The increase of the inlet turbine temperature is an efficient means of improving the power output. Without cooling, polycrystal alloys allow maximum wall temperature of 1300K, while single crystal alloys permit us to reach at least 100K above this temperature. The turbine inlet temperatures are closed to 1850K in military engines. The needs of the HP turbines of military motors are of the order of 2000K in the first nozzle guide vane and 1850K in the first rotor blade. Similar levels are expected in the future supersonic civil airplane [1].