What is tungsten crucible
Tungsten crucibles (English name: Tungsten Crucibles) are one of the tungsten metal products, mainly divided into sintering molding (applied to powder metallurgy technology), stamping molding, spinning type. The crucibles are made by turning tungsten rods (generally small in size), welding tungsten plates, tungsten sheets and pure tungsten rods by the corresponding process. The tungsten crucible can be used in a vacuum inert gas below 2600 degrees. Tungsten has high melting and boiling points, good high temperature strength, anti-abrasion and corrosion resistance, high thermal conductivity, low coefficient of thermal expansion, and good hardenability. Tungsten crucible is widely used in rare earth smelting, quartz glass, electronic spraying, crystal growth and other industries-
Introduction
Tungsten crucible is widely used in rare earth smelting, quartz glass, electronic spraying, crystal growth and other industries because of its high melting and boiling points, good high temperature strength, resistance to abrasion and corrosion, high thermal conductivity, low coefficient of thermal expansion and good quenchability.
Physical and chemical properties
1、 Purity: W≥99.95%.
2、 Density: ≥18.5g/cm3.
3、 Maximum application temperature environment: 2400℃.
Classification
Forged tungsten crucible
Sintered tungsten crucible
Production process
Tungsten powder - Sieved - Combined batch - Isostatic pressing - Rough turning - Medium frequency sintering - Fine turning - Packing.
Application
Since the melting point of tungsten is as high as 3410℃, tungsten crucible is widely used as the core vessel in industrial furnaces such as sapphire single crystal growth furnace, quartz glass melting furnace, rare earth smelting furnace, etc. The working temperature environment used is generally above 2000℃. Especially for sapphire single crystal growth furnaces, tungsten crucibles with high purity, high density, no internal cracks, precise size, smooth inner and outer walls, etc. play a key role in the success rate of seeding crystals, quality control of pulling crystals, de-crystallization sticking pots and service life in the sapphire crystal growth process.
