Tungsten Crucible

Tungsten crucible supplied by HEXON is characterized by its high purity, high density, exact tolerance, fine surface, and long service life.

Tungsten crucible’s core data such as density, grain size, roughness, hardness, chemical composition and tensile strength can be inspected by our specialized equipments.

NDT including ultrasonic and eddy current are employed in-house in order to prevent any hidden quality failures such as bubbles, pores and cracks inside of the tungsten crucibles.

According to different production technology and final application, tungsten crucibles are classified in three types. HEXON is able to provide standard size for industry and tailor-made special size according to customers’ specific drawings.

Pressed-sintered-fabricated crucible

● OD 50-600 mm

● Wall thickness 8-15 mm

● Height 50-700 mm

● Purity 99.95% minimum

● Density up to 18.9 g/cm3

● No pores, cracks and foreign impurities

● Surface roughness Ra<0.8 μm

Pressed-sintered crucible is formed by sintering and hot isostatic pressing (HIP). Net size and surface are machined by milling and polishing. They are widely used in sintering furnace, synthetic sapphire growing furnace, rare earth and glass melting furnace and related equipments.

Forged-machined crucible

● OD up to 20-100 mm

● Wall thickness 3-10 mm

● Height 10-200 mm

● Purity 99.95% minimum

● Surface roughness Ra<0.8 μm

Forged-machined crucible is manufactured from forged and HIP pressed tungsten solid rods, by mechanically turning, milling and polishing. Tungsten machined crucibles are typically used as the evaporation source in vapor deposition fields.

Spun crucible

● Diameter from 15 inches to 20 inches

● Purity 99.95% minimum

● High strength but low cost

● Low thermal inertia

Spun tungsten crucibles are a thin-walled crucibles manufactured from a single piece of tungsten plate. This process can be used to produce large-size thin-walled crucibles. Spinning is a CNC controlled pressure forming and processing method to form thin-wall hollow rotary parts. It relies on the feed movement of rotary wheel or lever rod to add pressure to the metal blanks rotating along the same axis of core mold, thus making local plastic deformation to form the required hollow. Spun tungsten crucibles are widely used in Sapphire crystal growth, rare-earth smelting, and coating industry as melting containers.