Heating Elements

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 20 centimetres and an approximate length of one metre, are drawn in a crystal drawing unit from molten silicon.
The melt is contained in a quartz crucible, this in turn being held in a graphite crucible. Graphite heating elements fixed with CFC screws
are used to heat the graphite crucible.