Heaters

Schunk manufactures its own crucibles and heating elements from graphite for drawing single silicon crystals.
Production of the silicon wafer begins with the drawing of single silicon crystals using the Czochralski technique.
The single silicon crystals, with a diameter of about 12" (30 centimeters) and an approximate length of 36" (one meter), are drawn in a crystal drawing unit from molten silicon.
The melt is contained in a quartz crucible, this in turn being held by a graphite crucible.
Graphite heating elements fixed with CFC screws are used to heat the graphite crucible.