Rhenium is used in nickel-based superalloys or together with molybdenum and tungsten in rocket and aircraft engines or stationary gas turbines. It is also used as a catalyst in the chemical and petrochemical industries. It is also used in technical spray powders for corrosion-resistant coatings. As a perfect metal for high-temperature applications, rhenium is very important for the production of lead-free gasoline and thermocouples.