Tungsten crucible
Tungsten Crucibles is one of metal Tungsten products, mainly divided into sintering molding (applied to powder metallurgy technology), stamping molding, spinning type. The use of tungsten rod turning forming (general size is relatively small), welding forming a variety of, the use of pure tungsten sheet, tungsten and pure tungsten rod by the corresponding process. Tungsten crucible can be used in vacuum inert gases up to 2600 degrees. Tungsten has high melting and boiling point, high temperature strength, abrasion resistance and corrosion resistance, large thermal conductivity, small thermal expansion coefficient and good hardenability. Tungsten crucible is widely used in rare earth smelting, quartz glass, electronic spraying, crystal growth and other industries.
Production process:
Tungsten powder - sieving - batch - static pressing - rough car processing - intermediate frequency sintering - fine car processing - packaging.
Because the melting point of tungsten is as high as 3410℃, the tungsten crucible is widely used in the core container of sapphire single crystal growth furnace, quartz glass melting furnace, rare earth smelting furnace and other industrial furnaces, and its working temperature environment is generally above 2000℃. Especially for the single crystal growth furnace of sapphire, the tungsten crucible has the characteristics of high purity, high density, no internal crack, precise size, smooth inner and outer wall, etc., which plays a key role in the success rate of seed crystal, the quality control of drawing crystal, the decrystallization stick pot and the service life of sapphire crystal growth.
