Tungsten crucible is one of the metal tungsten products, which is made of pure tungsten plate, tungsten sheet and tungsten rod by the corresponding processing techniques. Tungsten crucibles can be used in vacuum inert gas below 2600℃. Tungsten has high melting point and boiling point, good high-temperature strength, wear resistance and corrosion resistance, high thermal conductivity, small thermal expansion coefficient and good hardenability. Tungsten crucibles are widely used in rare earth smelting, quartz glass, electronic spraying, crystal growth and other industries.
Physical and chemical properties:
Purity: W ≥ 99. 95%;
Density: ≥ 18.5 g/cm3;
Working temperature: 2400℃.
Because the melting point of tungsten is as high as 3410℃, tungsten crucibles are widely used in the core containers of sapphire monocrystal growth furnaces, quartz glass smelting furnaces, rare earth smelting furnaces and other industrial furnaces, and their working temperature is generally above 2000℃. For sapphire monocrystal growth furnace, tungsten crucible features high purity, high density, no internal crack and smooth inner and outer walls, so it plays a key role in the success rate of seed crystal, the quality control of crystal pulling, preventing crystal from sticking and the service life of sapphire monocrystal growth furnace.