Applications

Metallurgy and Ultra-Pure Materials

High temperature resistance, inert behavior, good thermal conductivity, and high purity are some characteristics of SIGRADUR® glassy carbon which are advantageous when used as a material for vessels in metallurgy, monocrystal growth, and ultrapure materials technologies. The vessels can be used as susceptors in induction furnaces. Dental metal melting technology, zone melting of semiconductor components, gallium arsenide synthesis, monocrystal growth by the Bridgman or Czochralsky method, and the synthesis of fluorescent compounds are examples of typical industrial applications.

Melting vessels made of SIGRADUR® show demolding with a very high surface quality and no contamination by foreign elements. Due to its hardness and wear resistance, no carbon traces can be found in the melting substance. Metal melts that do not form carbides have no wetting effect on SIGRADUR® glassy carbon. Its good thermal shock resistance allows rapid heating and cooling times. Additionally, red-hot crucibles do not crack when placed on cold surfaces.