High-temperature component

A process for producing a high-temperature component having a coating for increasing thermal emissivity, the process comprising steps of:

• providing a main body of the high-temperature component;
• i) coating the main body with tungsten and rhenium by physical vapor deposition using a target material including tungsten and rhenium, the target material including at least 35% by weight Re3W phase;
• or
• ii) coating the main body with tungsten and rhenium by physical vapor deposition using a target material including tungsten and rhenium,
• heat treating the coated main body at a heat treatment temperature of at least 500° C. in an inert or reducing atmosphere or high vacuum to form the Re3W phase, and
• cooling the main body to room temperature at a cooling rate of greater than 20 K/min to kinetically stabilize the Re3W phase;
• or
• iii) coating the main body with a powder mixture containing rhenium and tungsten with a molar ratio of 25 at. % tungsten to 75 at. % rhenium by a powder metallurgical process,
• heat treating the coated main body at a heat treatment temperature of at least 500° C. in an inert or reducing atmosphere or high vacuum to form the Re3W phase,
• cooling the main body to room temperature at a cooling rate of greater than 20 K/min to kinetically stabilize the Re3W phase;
• and
• providing the coating with a thermal emissivity ε>0.6 in a wavelength range between 1700-2500 nm.