Modern aircraft such as spacecraft, artificial satellites and rockets, missiles, supersonic aircraft is towards high speed, high altitude, big thrust, long distance, high accuracy and safety in the direction of the development of zirconium and hafnium compounds (and) for some excellent performance, in addition to small nuclear structure and coating materials, also used in the Apollo spacecraft on the relevant parts. Hafnium can also be used as a small volume and high energy rocket propellant.
Hafnium compounds have several comprehensive properties such as refractory, oxidation resistance and corrosion resistance. They are high temperature resistant materials. Hafnium carbide of high melting point, more than 500 ℃ the tungsten carbide. Four tantalum carbide and 1 copy of hafnium carbide mixture and its melting point 4215 ℃, thus can make the structure of jet engines and missiles on lining material and high melting point metal melting crucible.
Boride hafnium (HfB2) with high temperature properties and good oxidation resistance, and can be used as materials, high-speed space rockets in 2000-2200 ℃ in the atmosphere. Boron compounds containing more hafnium have antioxidant properties 10 times greater than zirconium boride.
Hafnium carbide (HfC) with 3890 ℃ high melting point and high elasticity, good electric conductivity, the thermal expansion of small and good impact resistance, very suitable for rocket nozzle, for re-entry space rocket nose cone parts.
Tantalum - hafnium sandwich structure material, the heat of 2200 ℃ high temperature performance, as a rocket nozzle and other structural materials.
