14 kinds if Crucible Materials

Graphite (C )
Molybdenum (Mo)
Aluminum oxide (Al2O3)
Zirconium oxide (ZrO2)
Vitreous carbon (Glassy-Coated Carbon)
Boron nitride (BN)
Intermetallic (BN/TiB2)

Tungsten (W)
Quartz (SiO2)
Zirconium (Zr)
Tantalum (Ta)
Copper (Cu)
PBN